X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fchar%2Ftty_io.c;h=0b31cf25c25c2b535a4790f242cd4c3fc61fc8b2;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=f5e3bce8731bfc21cd597af3a6a879ca9b8d6c23;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index f5e3bce87..0b31cf25c 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -94,6 +94,7 @@ #include #include #include +#include #include #include @@ -130,7 +131,7 @@ LIST_HEAD(tty_drivers); /* linked list of tty drivers */ /* Semaphore to protect creating and releasing a tty. This is shared with vt.c for deeply disgusting hack reasons */ -DECLARE_MUTEX(tty_sem); +DEFINE_MUTEX(tty_mutex); #ifdef CONFIG_UNIX98_PTYS extern struct tty_driver *ptm_driver; /* Unix98 pty masters; for /dev/ptmx */ @@ -153,7 +154,6 @@ static int tty_release(struct inode *, struct file *); int tty_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg); static int tty_fasync(int fd, struct file * filp, int on); -extern void rs_360_init(void); static void release_mem(struct tty_struct *tty, int idx); @@ -167,9 +167,12 @@ static struct tty_struct *alloc_tty_struct(void) return tty; } +static void tty_buffer_free_all(struct tty_struct *); + static inline void free_tty_struct(struct tty_struct *tty) { kfree(tty->write_buf); + tty_buffer_free_all(tty); kfree(tty); } @@ -231,6 +234,232 @@ static int check_tty_count(struct tty_struct *tty, const char *routine) return 0; } +/* + * Tty buffer allocation management + */ + +static void tty_buffer_free_all(struct tty_struct *tty) +{ + struct tty_buffer *thead; + while((thead = tty->buf.head) != NULL) { + tty->buf.head = thead->next; + kfree(thead); + } + while((thead = tty->buf.free) != NULL) { + tty->buf.free = thead->next; + kfree(thead); + } + tty->buf.tail = NULL; +} + +static void tty_buffer_init(struct tty_struct *tty) +{ + spin_lock_init(&tty->buf.lock); + tty->buf.head = NULL; + tty->buf.tail = NULL; + tty->buf.free = NULL; +} + +static struct tty_buffer *tty_buffer_alloc(size_t size) +{ + struct tty_buffer *p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC); + if(p == NULL) + return NULL; + p->used = 0; + p->size = size; + p->next = NULL; + p->active = 0; + p->commit = 0; + p->read = 0; + p->char_buf_ptr = (char *)(p->data); + p->flag_buf_ptr = (unsigned char *)p->char_buf_ptr + size; +/* printk("Flip create %p\n", p); */ + return p; +} + +/* Must be called with the tty_read lock held. This needs to acquire strategy + code to decide if we should kfree or relink a given expired buffer */ + +static void tty_buffer_free(struct tty_struct *tty, struct tty_buffer *b) +{ + /* Dumb strategy for now - should keep some stats */ +/* printk("Flip dispose %p\n", b); */ + if(b->size >= 512) + kfree(b); + else { + b->next = tty->buf.free; + tty->buf.free = b; + } +} + +static struct tty_buffer *tty_buffer_find(struct tty_struct *tty, size_t size) +{ + struct tty_buffer **tbh = &tty->buf.free; + while((*tbh) != NULL) { + struct tty_buffer *t = *tbh; + if(t->size >= size) { + *tbh = t->next; + t->next = NULL; + t->used = 0; + t->commit = 0; + t->read = 0; + /* DEBUG ONLY */ +/* memset(t->data, '*', size); */ +/* printk("Flip recycle %p\n", t); */ + return t; + } + tbh = &((*tbh)->next); + } + /* Round the buffer size out */ + size = (size + 0xFF) & ~ 0xFF; + return tty_buffer_alloc(size); + /* Should possibly check if this fails for the largest buffer we + have queued and recycle that ? */ +} + +int tty_buffer_request_room(struct tty_struct *tty, size_t size) +{ + struct tty_buffer *b, *n; + int left; + unsigned long flags; + + spin_lock_irqsave(&tty->buf.lock, flags); + + /* OPTIMISATION: We could keep a per tty "zero" sized buffer to + remove this conditional if its worth it. This would be invisible + to the callers */ + if ((b = tty->buf.tail) != NULL) { + left = b->size - b->used; + b->active = 1; + } else + left = 0; + + if (left < size) { + /* This is the slow path - looking for new buffers to use */ + if ((n = tty_buffer_find(tty, size)) != NULL) { + if (b != NULL) { + b->next = n; + b->active = 0; + b->commit = b->used; + } else + tty->buf.head = n; + tty->buf.tail = n; + n->active = 1; + } else + size = left; + } + + spin_unlock_irqrestore(&tty->buf.lock, flags); + return size; +} +EXPORT_SYMBOL_GPL(tty_buffer_request_room); + +int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, + size_t size) +{ + int copied = 0; + do { + int space = tty_buffer_request_room(tty, size - copied); + struct tty_buffer *tb = tty->buf.tail; + /* If there is no space then tb may be NULL */ + if(unlikely(space == 0)) + break; + memcpy(tb->char_buf_ptr + tb->used, chars, space); + memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space); + tb->used += space; + copied += space; + chars += space; + } + /* There is a small chance that we need to split the data over + several buffers. If this is the case we must loop */ + while (unlikely(size > copied)); + return copied; +} +EXPORT_SYMBOL(tty_insert_flip_string); + +int tty_insert_flip_string_flags(struct tty_struct *tty, + const unsigned char *chars, const char *flags, size_t size) +{ + int copied = 0; + do { + int space = tty_buffer_request_room(tty, size - copied); + struct tty_buffer *tb = tty->buf.tail; + /* If there is no space then tb may be NULL */ + if(unlikely(space == 0)) + break; + memcpy(tb->char_buf_ptr + tb->used, chars, space); + memcpy(tb->flag_buf_ptr + tb->used, flags, space); + tb->used += space; + copied += space; + chars += space; + flags += space; + } + /* There is a small chance that we need to split the data over + several buffers. If this is the case we must loop */ + while (unlikely(size > copied)); + return copied; +} +EXPORT_SYMBOL(tty_insert_flip_string_flags); + +void tty_schedule_flip(struct tty_struct *tty) +{ + unsigned long flags; + spin_lock_irqsave(&tty->buf.lock, flags); + if (tty->buf.tail != NULL) { + tty->buf.tail->active = 0; + tty->buf.tail->commit = tty->buf.tail->used; + } + spin_unlock_irqrestore(&tty->buf.lock, flags); + schedule_delayed_work(&tty->buf.work, 1); +} +EXPORT_SYMBOL(tty_schedule_flip); + +/* + * Prepare a block of space in the buffer for data. Returns the length + * available and buffer pointer to the space which is now allocated and + * accounted for as ready for normal characters. This is used for drivers + * that need their own block copy routines into the buffer. There is no + * guarantee the buffer is a DMA target! + */ + +int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars, size_t size) +{ + int space = tty_buffer_request_room(tty, size); + if (likely(space)) { + struct tty_buffer *tb = tty->buf.tail; + *chars = tb->char_buf_ptr + tb->used; + memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space); + tb->used += space; + } + return space; +} + +EXPORT_SYMBOL_GPL(tty_prepare_flip_string); + +/* + * Prepare a block of space in the buffer for data. Returns the length + * available and buffer pointer to the space which is now allocated and + * accounted for as ready for characters. This is used for drivers + * that need their own block copy routines into the buffer. There is no + * guarantee the buffer is a DMA target! + */ + +int tty_prepare_flip_string_flags(struct tty_struct *tty, unsigned char **chars, char **flags, size_t size) +{ + int space = tty_buffer_request_room(tty, size); + if (likely(space)) { + struct tty_buffer *tb = tty->buf.tail; + *chars = tb->char_buf_ptr + tb->used; + *flags = tb->flag_buf_ptr + tb->used; + tb->used += space; + } + return space; +} + +EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags); + + + /* * This is probably overkill for real world processors but * they are not on hot paths so a little discipline won't do @@ -252,7 +481,7 @@ static void tty_set_termios_ldisc(struct tty_struct *tty, int num) static DEFINE_SPINLOCK(tty_ldisc_lock); static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait); -static struct tty_ldisc tty_ldiscs[NR_LDISCS]; /* line disc dispatch table */ +static struct tty_ldisc tty_ldiscs[NR_LDISCS]; /* line disc dispatch table */ int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc) { @@ -263,24 +492,35 @@ int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc) return -EINVAL; spin_lock_irqsave(&tty_ldisc_lock, flags); - if (new_ldisc) { - tty_ldiscs[disc] = *new_ldisc; - tty_ldiscs[disc].num = disc; - tty_ldiscs[disc].flags |= LDISC_FLAG_DEFINED; - tty_ldiscs[disc].refcount = 0; - } else { - if(tty_ldiscs[disc].refcount) - ret = -EBUSY; - else - tty_ldiscs[disc].flags &= ~LDISC_FLAG_DEFINED; - } + tty_ldiscs[disc] = *new_ldisc; + tty_ldiscs[disc].num = disc; + tty_ldiscs[disc].flags |= LDISC_FLAG_DEFINED; + tty_ldiscs[disc].refcount = 0; spin_unlock_irqrestore(&tty_ldisc_lock, flags); return ret; } - EXPORT_SYMBOL(tty_register_ldisc); +int tty_unregister_ldisc(int disc) +{ + unsigned long flags; + int ret = 0; + + if (disc < N_TTY || disc >= NR_LDISCS) + return -EINVAL; + + spin_lock_irqsave(&tty_ldisc_lock, flags); + if (tty_ldiscs[disc].refcount) + ret = -EBUSY; + else + tty_ldiscs[disc].flags &= ~LDISC_FLAG_DEFINED; + spin_unlock_irqrestore(&tty_ldisc_lock, flags); + + return ret; +} +EXPORT_SYMBOL(tty_unregister_ldisc); + struct tty_ldisc *tty_ldisc_get(int disc) { unsigned long flags; @@ -314,14 +554,12 @@ void tty_ldisc_put(int disc) struct tty_ldisc *ld; unsigned long flags; - if (disc < N_TTY || disc >= NR_LDISCS) - BUG(); + BUG_ON(disc < N_TTY || disc >= NR_LDISCS); spin_lock_irqsave(&tty_ldisc_lock, flags); ld = &tty_ldiscs[disc]; - if(ld->refcount == 0) - BUG(); - ld->refcount --; + BUG_ON(ld->refcount == 0); + ld->refcount--; module_put(ld->owner); spin_unlock_irqrestore(&tty_ldisc_lock, flags); } @@ -416,8 +654,7 @@ void tty_ldisc_deref(struct tty_ldisc *ld) { unsigned long flags; - if(ld == NULL) - BUG(); + BUG_ON(ld == NULL); spin_lock_irqsave(&tty_ldisc_lock, flags); if(ld->refcount == 0) @@ -459,21 +696,19 @@ static void tty_ldisc_enable(struct tty_struct *tty) static int tty_set_ldisc(struct tty_struct *tty, int ldisc) { - int retval = 0; - struct tty_ldisc o_ldisc; + int retval = 0; + struct tty_ldisc o_ldisc; char buf[64]; int work; unsigned long flags; struct tty_ldisc *ld; + struct tty_struct *o_tty; if ((ldisc < N_TTY) || (ldisc >= NR_LDISCS)) return -EINVAL; restart: - if (tty->ldisc.num == ldisc) - return 0; /* We are already in the desired discipline */ - ld = tty_ldisc_get(ldisc); /* Eduardo Blanco */ /* Cyrus Durgin */ @@ -484,48 +719,88 @@ restart: if (ld == NULL) return -EINVAL; - o_ldisc = tty->ldisc; + /* + * No more input please, we are switching. The new ldisc + * will update this value in the ldisc open function + */ + + tty->receive_room = 0; + + /* + * Problem: What do we do if this blocks ? + */ tty_wait_until_sent(tty, 0); + if (tty->ldisc.num == ldisc) { + tty_ldisc_put(ldisc); + return 0; + } + + o_ldisc = tty->ldisc; + o_tty = tty->link; + /* * Make sure we don't change while someone holds a * reference to the line discipline. The TTY_LDISC bit * prevents anyone taking a reference once it is clear. * We need the lock to avoid racing reference takers. */ - + spin_lock_irqsave(&tty_ldisc_lock, flags); - if(tty->ldisc.refcount) - { - /* Free the new ldisc we grabbed. Must drop the lock - first. */ + if (tty->ldisc.refcount || (o_tty && o_tty->ldisc.refcount)) { + if(tty->ldisc.refcount) { + /* Free the new ldisc we grabbed. Must drop the lock + first. */ + spin_unlock_irqrestore(&tty_ldisc_lock, flags); + tty_ldisc_put(ldisc); + /* + * There are several reasons we may be busy, including + * random momentary I/O traffic. We must therefore + * retry. We could distinguish between blocking ops + * and retries if we made tty_ldisc_wait() smarter. That + * is up for discussion. + */ + if (wait_event_interruptible(tty_ldisc_wait, tty->ldisc.refcount == 0) < 0) + return -ERESTARTSYS; + goto restart; + } + if(o_tty && o_tty->ldisc.refcount) { + spin_unlock_irqrestore(&tty_ldisc_lock, flags); + tty_ldisc_put(ldisc); + if (wait_event_interruptible(tty_ldisc_wait, o_tty->ldisc.refcount == 0) < 0) + return -ERESTARTSYS; + goto restart; + } + } + + /* if the TTY_LDISC bit is set, then we are racing against another ldisc change */ + + if (!test_bit(TTY_LDISC, &tty->flags)) { spin_unlock_irqrestore(&tty_ldisc_lock, flags); tty_ldisc_put(ldisc); - /* - * There are several reasons we may be busy, including - * random momentary I/O traffic. We must therefore - * retry. We could distinguish between blocking ops - * and retries if we made tty_ldisc_wait() smarter. That - * is up for discussion. - */ - if(wait_event_interruptible(tty_ldisc_wait, tty->ldisc.refcount == 0) < 0) - return -ERESTARTSYS; + ld = tty_ldisc_ref_wait(tty); + tty_ldisc_deref(ld); goto restart; } - clear_bit(TTY_LDISC, &tty->flags); + + clear_bit(TTY_LDISC, &tty->flags); clear_bit(TTY_DONT_FLIP, &tty->flags); + if (o_tty) { + clear_bit(TTY_LDISC, &o_tty->flags); + clear_bit(TTY_DONT_FLIP, &o_tty->flags); + } spin_unlock_irqrestore(&tty_ldisc_lock, flags); - + /* * From this point on we know nobody has an ldisc * usage reference, nor can they obtain one until * we say so later on. */ - - work = cancel_delayed_work(&tty->flip.work); + + work = cancel_delayed_work(&tty->buf.work); /* - * Wait for ->hangup_work and ->flip.work handlers to terminate + * Wait for ->hangup_work and ->buf.work handlers to terminate */ flush_scheduled_work(); @@ -573,11 +848,13 @@ restart: */ tty_ldisc_enable(tty); + if (o_tty) + tty_ldisc_enable(o_tty); /* Restart it in case no characters kick it off. Safe if already running */ - if(work) - schedule_delayed_work(&tty->flip.work, 1); + if (work) + schedule_delayed_work(&tty->buf.work, 1); return retval; } @@ -770,7 +1047,7 @@ static void do_tty_hangup(void *data) check_tty_count(tty, "do_tty_hangup"); file_list_lock(); /* This breaks for file handles being sent over AF_UNIX sockets ? */ - list_for_each_entry(filp, &tty->tty_files, f_list) { + list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) { if (filp->f_op->write == redirected_tty_write) cons_filp = filp; if (filp->f_op->write != tty_write) @@ -828,8 +1105,8 @@ static void do_tty_hangup(void *data) p->signal->tty = NULL; if (!p->signal->leader) continue; - send_group_sig_info(SIGHUP, SEND_SIG_PRIV, p); - send_group_sig_info(SIGCONT, SEND_SIG_PRIV, p); + group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p); + group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p); if (tty->pgrp > 0) p->signal->tty_old_pgrp = tty->pgrp; } while_each_task_pid(tty->session, PIDTYPE_SID, p); @@ -919,11 +1196,11 @@ void disassociate_ctty(int on_exit) lock_kernel(); - down(&tty_sem); + mutex_lock(&tty_mutex); tty = current->signal->tty; if (tty) { tty_pgrp = tty->pgrp; - up(&tty_sem); + mutex_unlock(&tty_mutex); if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY) tty_vhangup(tty); } else { @@ -931,7 +1208,7 @@ void disassociate_ctty(int on_exit) kill_pg(current->signal->tty_old_pgrp, SIGHUP, on_exit); kill_pg(current->signal->tty_old_pgrp, SIGCONT, on_exit); } - up(&tty_sem); + mutex_unlock(&tty_mutex); unlock_kernel(); return; } @@ -942,7 +1219,7 @@ void disassociate_ctty(int on_exit) } /* Must lock changes to tty_old_pgrp */ - down(&tty_sem); + mutex_lock(&tty_mutex); current->signal->tty_old_pgrp = 0; tty->session = 0; tty->pgrp = -1; @@ -953,7 +1230,7 @@ void disassociate_ctty(int on_exit) p->signal->tty = NULL; } while_each_task_pid(current->signal->session, PIDTYPE_SID, p); read_unlock(&tasklist_lock); - up(&tty_sem); + mutex_unlock(&tty_mutex); unlock_kernel(); } @@ -1037,7 +1314,7 @@ static inline ssize_t do_tty_write( ssize_t ret = 0, written = 0; unsigned int chunk; - if (down_interruptible(&tty->atomic_write)) { + if (mutex_lock_interruptible(&tty->atomic_write_lock)) { return -ERESTARTSYS; } @@ -1060,7 +1337,7 @@ static inline ssize_t do_tty_write( if (count < chunk) chunk = count; - /* write_buf/write_cnt is protected by the atomic_write semaphore */ + /* write_buf/write_cnt is protected by the atomic_write_lock mutex */ if (tty->write_cnt < chunk) { unsigned char *buf; @@ -1069,7 +1346,7 @@ static inline ssize_t do_tty_write( buf = kmalloc(chunk, GFP_KERNEL); if (!buf) { - up(&tty->atomic_write); + mutex_unlock(&tty->atomic_write_lock); return -ENOMEM; } kfree(tty->write_buf); @@ -1105,7 +1382,7 @@ static inline ssize_t do_tty_write( inode->i_mtime = current_fs_time(inode->i_sb); ret = written; } - up(&tty->atomic_write); + mutex_unlock(&tty->atomic_write_lock); return ret; } @@ -1173,8 +1450,8 @@ static inline void tty_line_name(struct tty_driver *driver, int index, char *p) /* * WSH 06/09/97: Rewritten to remove races and properly clean up after a - * failed open. The new code protects the open with a semaphore, so it's - * really quite straightforward. The semaphore locking can probably be + * failed open. The new code protects the open with a mutex, so it's + * really quite straightforward. The mutex locking can probably be * relaxed for the (most common) case of reopening a tty. */ static int init_dev(struct tty_driver *driver, int idx, @@ -1371,20 +1648,17 @@ fast_track: success: *ret_tty = tty; - /* All paths come through here to release the semaphore */ + /* All paths come through here to release the mutex */ end_init: return retval; /* Release locally allocated memory ... nothing placed in slots */ free_mem_out: - if (o_tp) - kfree(o_tp); + kfree(o_tp); if (o_tty) free_tty_struct(o_tty); - if (ltp) - kfree(ltp); - if (tp) - kfree(tp); + kfree(ltp); + kfree(tp); free_tty_struct(tty); fail_no_mem: @@ -1400,6 +1674,19 @@ release_mem_out: goto end_init; } +/* + * Get a copy of the termios structure for the driver/index + */ +void tty_get_termios(struct tty_driver *driver, int idx, struct termios *tio) +{ + lock_kernel(); + if (driver->termios[idx]) + *tio = *driver->termios[idx]; + else + *tio = driver->init_termios; + unlock_kernel(); +} + /* * Releases memory associated with a tty structure, and clears out the * driver table slots. @@ -1467,7 +1754,7 @@ static void release_dev(struct file * filp) { struct tty_struct *tty, *o_tty; int pty_master, tty_closing, o_tty_closing, do_sleep; - int devpts_master, devpts; + int devpts; int idx; char buf[64]; unsigned long flags; @@ -1484,7 +1771,6 @@ static void release_dev(struct file * filp) pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY && tty->driver->subtype == PTY_TYPE_MASTER); devpts = (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) != 0; - devpts_master = pty_master && devpts; o_tty = tty->link; #ifdef TTY_PARANOIA_CHECK @@ -1571,11 +1857,10 @@ static void release_dev(struct file * filp) /* Guard against races with tty->count changes elsewhere and opens on /dev/tty */ - down(&tty_sem); + mutex_lock(&tty_mutex); tty_closing = tty->count <= 1; o_tty_closing = o_tty && (o_tty->count <= (pty_master ? 1 : 0)); - up(&tty_sem); do_sleep = 0; if (tty_closing) { @@ -1603,6 +1888,7 @@ static void release_dev(struct file * filp) printk(KERN_WARNING "release_dev: %s: read/write wait queue " "active!\n", tty_name(tty, buf)); + mutex_unlock(&tty_mutex); schedule(); } @@ -1611,8 +1897,6 @@ static void release_dev(struct file * filp) * both sides, and we've completed the last operation that could * block, so it's safe to proceed with closing. */ - - down(&tty_sem); if (pty_master) { if (--o_tty->count < 0) { printk(KERN_WARNING "release_dev: bad pty slave count " @@ -1626,7 +1910,6 @@ static void release_dev(struct file * filp) tty->count, tty_name(tty, buf)); tty->count = 0; } - up(&tty_sem); /* * We've decremented tty->count, so we need to remove this file @@ -1671,6 +1954,8 @@ static void release_dev(struct file * filp) read_unlock(&tasklist_lock); } + mutex_unlock(&tty_mutex); + /* check whether both sides are closing ... */ if (!tty_closing || (o_tty && !o_tty_closing)) return; @@ -1685,10 +1970,10 @@ static void release_dev(struct file * filp) */ clear_bit(TTY_LDISC, &tty->flags); clear_bit(TTY_DONT_FLIP, &tty->flags); - cancel_delayed_work(&tty->flip.work); + cancel_delayed_work(&tty->buf.work); /* - * Wait for ->hangup_work and ->flip.work handlers to terminate + * Wait for ->hangup_work and ->buf.work handlers to terminate */ flush_scheduled_work(); @@ -1775,11 +2060,11 @@ retry_open: index = -1; retval = 0; - down(&tty_sem); + mutex_lock(&tty_mutex); if (device == MKDEV(TTYAUX_MAJOR,0)) { if (!current->signal->tty) { - up(&tty_sem); + mutex_unlock(&tty_mutex); return -ENXIO; } driver = current->signal->tty->driver; @@ -1805,18 +2090,18 @@ retry_open: noctty = 1; goto got_driver; } - up(&tty_sem); + mutex_unlock(&tty_mutex); return -ENODEV; } driver = get_tty_driver(device, &index); if (!driver) { - up(&tty_sem); + mutex_unlock(&tty_mutex); return -ENODEV; } got_driver: retval = init_dev(driver, index, &tty); - up(&tty_sem); + mutex_unlock(&tty_mutex); if (retval) return retval; @@ -1902,9 +2187,9 @@ static int ptmx_open(struct inode * inode, struct file * filp) } up(&allocated_ptys_lock); - down(&tty_sem); + mutex_lock(&tty_mutex); retval = init_dev(ptm_driver, index, &tty); - up(&tty_sem); + mutex_unlock(&tty_mutex); if (retval) goto out; @@ -1923,6 +2208,7 @@ static int ptmx_open(struct inode * inode, struct file * filp) return 0; out1: release_dev(filp); + return retval; out: down(&allocated_ptys_lock); idr_remove(&allocated_ptys, index); @@ -2175,12 +2461,11 @@ static int tiocsetd(struct tty_struct *tty, int __user *p) return tty_set_ldisc(tty, ldisc); } -static int send_break(struct tty_struct *tty, int duration) +static int send_break(struct tty_struct *tty, unsigned int duration) { tty->driver->break_ctl(tty, -1); if (!signal_pending(current)) { - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(duration); + msleep_interruptible(duration); } tty->driver->break_ctl(tty, 0); if (signal_pending(current)) @@ -2361,10 +2646,10 @@ int tty_ioctl(struct inode * inode, struct file * file, * all by anyone? */ if (!arg) - return send_break(tty, HZ/4); + return send_break(tty, 250); return 0; case TCSBRKP: /* support for POSIX tcsendbreak() */ - return send_break(tty, arg ? arg*(HZ/10) : HZ/4); + return send_break(tty, arg ? arg*100 : 250); case TIOCMGET: return tty_tiocmget(tty, file, p); @@ -2416,11 +2701,12 @@ static void __do_SAK(void *arg) tty_hangup(tty); #else struct tty_struct *tty = arg; - struct task_struct *p; + struct task_struct *g, *p; int session; int i; struct file *filp; struct tty_ldisc *disc; + struct fdtable *fdt; if (!tty) return; @@ -2436,8 +2722,18 @@ static void __do_SAK(void *arg) tty->driver->flush_buffer(tty); read_lock(&tasklist_lock); + /* Kill the entire session */ do_each_task_pid(session, PIDTYPE_SID, p) { - if (p->signal->tty == tty || session > 0) { + printk(KERN_NOTICE "SAK: killed process %d" + " (%s): p->signal->session==tty->session\n", + p->pid, p->comm); + send_sig(SIGKILL, p, 1); + } while_each_task_pid(session, PIDTYPE_SID, p); + /* Now kill any processes that happen to have the + * tty open. + */ + do_each_thread(g, p) { + if (p->signal->tty == tty) { printk(KERN_NOTICE "SAK: killed process %d" " (%s): p->signal->session==tty->session\n", p->pid, p->comm); @@ -2446,8 +2742,13 @@ static void __do_SAK(void *arg) } task_lock(p); if (p->files) { + /* + * We don't take a ref to the file, so we must + * hold ->file_lock instead. + */ spin_lock(&p->files->file_lock); - for (i=0; i < p->files->max_fds; i++) { + fdt = files_fdtable(p->files); + for (i=0; i < fdt->max_fds; i++) { filp = fcheck_files(p->files, i); if (!filp) continue; @@ -2456,14 +2757,14 @@ static void __do_SAK(void *arg) printk(KERN_NOTICE "SAK: killed process %d" " (%s): fd#%d opened to the tty\n", p->pid, p->comm, i); - send_sig(SIGKILL, p, 1); + force_sig(SIGKILL, p); break; } } spin_unlock(&p->files->file_lock); } task_unlock(p); - } while_each_task_pid(session, PIDTYPE_SID, p); + } while_each_thread(g, p); read_unlock(&tasklist_lock); #endif } @@ -2486,17 +2787,18 @@ EXPORT_SYMBOL(do_SAK); /* * This routine is called out of the software interrupt to flush data - * from the flip buffer to the line discipline. + * from the buffer chain to the line discipline. */ static void flush_to_ldisc(void *private_) { struct tty_struct *tty = (struct tty_struct *) private_; - unsigned char *cp; - char *fp; - int count; unsigned long flags; struct tty_ldisc *disc; + struct tty_buffer *tbuf; + int count; + char *char_buf; + unsigned char *flag_buf; disc = tty_ldisc_ref(tty); if (disc == NULL) /* !TTY_LDISC */ @@ -2506,28 +2808,27 @@ static void flush_to_ldisc(void *private_) /* * Do it after the next timer tick: */ - schedule_delayed_work(&tty->flip.work, 1); + schedule_delayed_work(&tty->buf.work, 1); goto out; } - spin_lock_irqsave(&tty->read_lock, flags); - if (tty->flip.buf_num) { - cp = tty->flip.char_buf + TTY_FLIPBUF_SIZE; - fp = tty->flip.flag_buf + TTY_FLIPBUF_SIZE; - tty->flip.buf_num = 0; - tty->flip.char_buf_ptr = tty->flip.char_buf; - tty->flip.flag_buf_ptr = tty->flip.flag_buf; - } else { - cp = tty->flip.char_buf; - fp = tty->flip.flag_buf; - tty->flip.buf_num = 1; - tty->flip.char_buf_ptr = tty->flip.char_buf + TTY_FLIPBUF_SIZE; - tty->flip.flag_buf_ptr = tty->flip.flag_buf + TTY_FLIPBUF_SIZE; + spin_lock_irqsave(&tty->buf.lock, flags); + while((tbuf = tty->buf.head) != NULL) { + while ((count = tbuf->commit - tbuf->read) != 0) { + char_buf = tbuf->char_buf_ptr + tbuf->read; + flag_buf = tbuf->flag_buf_ptr + tbuf->read; + tbuf->read += count; + spin_unlock_irqrestore(&tty->buf.lock, flags); + disc->receive_buf(tty, char_buf, flag_buf, count); + spin_lock_irqsave(&tty->buf.lock, flags); + } + if (tbuf->active) + break; + tty->buf.head = tbuf->next; + if (tty->buf.head == NULL) + tty->buf.tail = NULL; + tty_buffer_free(tty, tbuf); } - count = tty->flip.count; - tty->flip.count = 0; - spin_unlock_irqrestore(&tty->read_lock, flags); - - disc->receive_buf(tty, cp, fp, count); + spin_unlock_irqrestore(&tty->buf.lock, flags); out: tty_ldisc_deref(disc); } @@ -2619,14 +2920,23 @@ EXPORT_SYMBOL(tty_get_baud_rate); void tty_flip_buffer_push(struct tty_struct *tty) { + unsigned long flags; + spin_lock_irqsave(&tty->buf.lock, flags); + if (tty->buf.tail != NULL) { + tty->buf.tail->active = 0; + tty->buf.tail->commit = tty->buf.tail->used; + } + spin_unlock_irqrestore(&tty->buf.lock, flags); + if (tty->low_latency) flush_to_ldisc((void *) tty); else - schedule_delayed_work(&tty->flip.work, 1); + schedule_delayed_work(&tty->buf.work, 1); } EXPORT_SYMBOL(tty_flip_buffer_push); + /* * This subroutine initializes a tty structure. */ @@ -2637,16 +2947,16 @@ static void initialize_tty_struct(struct tty_struct *tty) tty_ldisc_assign(tty, tty_ldisc_get(N_TTY)); tty->pgrp = -1; tty->overrun_time = jiffies; - tty->flip.char_buf_ptr = tty->flip.char_buf; - tty->flip.flag_buf_ptr = tty->flip.flag_buf; - INIT_WORK(&tty->flip.work, flush_to_ldisc, tty); - init_MUTEX(&tty->flip.pty_sem); + tty->buf.head = tty->buf.tail = NULL; + tty_buffer_init(tty); + INIT_WORK(&tty->buf.work, flush_to_ldisc, tty); + init_MUTEX(&tty->buf.pty_sem); init_MUTEX(&tty->termios_sem); init_waitqueue_head(&tty->write_wait); init_waitqueue_head(&tty->read_wait); INIT_WORK(&tty->hangup_work, do_tty_hangup, tty); - sema_init(&tty->atomic_read, 1); - sema_init(&tty->atomic_write, 1); + mutex_init(&tty->atomic_read_lock); + mutex_init(&tty->atomic_write_lock); spin_lock_init(&tty->read_lock); INIT_LIST_HEAD(&tty->tty_files); INIT_WORK(&tty->SAK_work, NULL, NULL); @@ -2660,7 +2970,7 @@ static void tty_default_put_char(struct tty_struct *tty, unsigned char ch) tty->driver->write(tty, &ch, 1); } -static struct class_simple *tty_class; +static struct class *tty_class; /** * tty_register_device - register a tty device @@ -2693,7 +3003,7 @@ void tty_register_device(struct tty_driver *driver, unsigned index, pty_line_name(driver, index, name); else tty_line_name(driver, index, name); - class_simple_device_add(tty_class, dev, device, name); + class_device_create(tty_class, NULL, dev, device, "%s", name); } /** @@ -2707,7 +3017,7 @@ void tty_register_device(struct tty_driver *driver, unsigned index, void tty_unregister_device(struct tty_driver *driver, unsigned index) { devfs_remove("%s%d", driver->devfs_name, index + driver->name_base); - class_simple_device_remove(MKDEV(driver->major, driver->minor_start) + index); + class_device_destroy(tty_class, MKDEV(driver->major, driver->minor_start) + index); } EXPORT_SYMBOL(tty_register_device); @@ -2905,11 +3215,6 @@ void __init console_init(void) */ #ifdef CONFIG_EARLY_PRINTK disable_early_printk(); -#endif -#ifdef CONFIG_SERIAL_68360 - /* This is not a console initcall. I know not what it's doing here. - So I haven't moved it. dwmw2 */ - rs_360_init(); #endif call = __con_initcall_start; while (call < __con_initcall_end) { @@ -2924,7 +3229,7 @@ extern int vty_init(void); static int __init tty_class_init(void) { - tty_class = class_simple_create(THIS_MODULE, "tty"); + tty_class = class_create(THIS_MODULE, "tty"); if (IS_ERR(tty_class)) return PTR_ERR(tty_class); return 0; @@ -2953,14 +3258,14 @@ static int __init tty_init(void) register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0) panic("Couldn't register /dev/tty driver\n"); devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 0), S_IFCHR|S_IRUGO|S_IWUGO, "tty"); - class_simple_device_add(tty_class, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty"); + class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty"); cdev_init(&console_cdev, &console_fops); if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) || register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0) panic("Couldn't register /dev/console driver\n"); devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 1), S_IFCHR|S_IRUSR|S_IWUSR, "console"); - class_simple_device_add(tty_class, MKDEV(TTYAUX_MAJOR, 1), NULL, "console"); + class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, "console"); #ifdef CONFIG_UNIX98_PTYS cdev_init(&ptmx_cdev, &ptmx_fops); @@ -2968,7 +3273,7 @@ static int __init tty_init(void) register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) panic("Couldn't register /dev/ptmx driver\n"); devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 2), S_IFCHR|S_IRUGO|S_IWUGO, "ptmx"); - class_simple_device_add(tty_class, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); + class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); #endif #ifdef CONFIG_VT @@ -2977,7 +3282,7 @@ static int __init tty_init(void) register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) panic("Couldn't register /dev/tty0 driver\n"); devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR, "vc/0"); - class_simple_device_add(tty_class, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); + class_device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); vty_init(); #endif