vserver 1.9.3

[linux-2.6.git] / drivers / net / slip.c

diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index e783ac0..0c1995b 100644 (file)
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -672,7 +672,9 @@ static int slip_receive_room(struct tty_struct *tty)
  * Handle the 'receiver data ready' interrupt.
  * This function is called by the 'tty_io' module in the kernel when
  * a block of SLIP data has been received, which can now be decapsulated
- * and sent on to some IP layer for further processing.
+ * and sent on to some IP layer for further processing. This will not
+ * be re-entered while running but other ldisc functions may be called
+ * in parallel
  */
  
 static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
@@ -841,9 +843,11 @@ sl_alloc(dev_t line)
  * SLIP line discipline is called for.  Because we are
  * sure the tty line exists, we only have to link it to
  * a free SLIP channel...
+ *
+ * Called in process context serialized from other ldisc calls.
  */
-static int
-slip_open(struct tty_struct *tty)
+
+static int slip_open(struct tty_struct *tty)
 {
        struct slip *sl;
        int err;
@@ -876,11 +880,11 @@ slip_open(struct tty_struct *tty)
        tty->disc_data = sl;
        sl->line = tty_devnum(tty);
        sl->pid = current->pid;
+       
+       /* FIXME: already done before we were called - seems this can go */
        if (tty->driver->flush_buffer)
                tty->driver->flush_buffer(tty);
-       if (tty->ldisc.flush_buffer)
-               tty->ldisc.flush_buffer(tty);
-
+               
        if (!test_bit(SLF_INUSE, &sl->flags)) {
                /* Perform the low-level SLIP initialization. */
                if ((err = sl_alloc_bufs(sl, SL_MTU)) != 0)
@@ -923,6 +927,9 @@ err_exit:
 }
 
 /*
+
+  FIXME: 1,2 are fixed 3 was never true anyway.
+  
    Let me to blame a bit.
    1. TTY module calls this funstion on soft interrupt.
    2. TTY module calls this function WITH MASKED INTERRUPTS!
@@ -941,9 +948,8 @@ err_exit:
 
 /*
  * Close down a SLIP channel.
- * This means flushing out any pending queues, and then restoring the
- * TTY line discipline to what it was before it got hooked to SLIP
- * (which usually is TTY again).
+ * This means flushing out any pending queues, and then returning. This
+ * call is serialized against other ldisc functions.
  */
 static void
 slip_close(struct tty_struct *tty)
@@ -954,7 +960,7 @@ slip_close(struct tty_struct *tty)
        if (!sl || sl->magic != SLIP_MAGIC || sl->tty != tty)
                return;
 
-       tty->disc_data = 0;
+       tty->disc_data = NULL;
        sl->tty = NULL;
        if (!sl->leased)
                sl->line = 0;
@@ -1138,6 +1144,7 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
 {
        struct slip *sl = (struct slip *) tty->disc_data;
        unsigned int tmp;
+       int __user *p = (int __user *)arg;
 
        /* First make sure we're connected. */
        if (!sl || sl->magic != SLIP_MAGIC) {
@@ -1147,17 +1154,17 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
        switch(cmd) {
         case SIOCGIFNAME:
                tmp = strlen(sl->dev->name) + 1;
-               if (copy_to_user((void *)arg, sl->dev->name, tmp))
+               if (copy_to_user((void __user *)arg, sl->dev->name, tmp))
                        return -EFAULT;
                return 0;
 
        case SIOCGIFENCAP:
-               if (put_user(sl->mode, (int *)arg))
+               if (put_user(sl->mode, p))
                        return -EFAULT;
                return 0;
 
        case SIOCSIFENCAP:
-               if (get_user(tmp,(int *)arg))
+               if (get_user(tmp, p))
                        return -EFAULT;
 #ifndef SL_INCLUDE_CSLIP
                if (tmp & (SL_MODE_CSLIP|SL_MODE_ADAPTIVE))  {
@@ -1185,7 +1192,7 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
 #ifdef CONFIG_SLIP_SMART
        /* VSV changes start here */
         case SIOCSKEEPALIVE:
-               if (get_user(tmp,(int *)arg))
+               if (get_user(tmp, p))
                        return -EFAULT;
                 if (tmp > 255) /* max for unchar */
                        return -EINVAL;
@@ -1205,12 +1212,12 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
                return 0;
 
         case SIOCGKEEPALIVE:
-               if (put_user(sl->keepalive, (int *)arg))
+               if (put_user(sl->keepalive, p))
                        return -EFAULT;
                return 0;
 
         case SIOCSOUTFILL:
-               if (get_user(tmp,(int *)arg))
+               if (get_user(tmp, p))
                        return -EFAULT;
                 if (tmp > 255) /* max for unchar */
                        return -EINVAL;
@@ -1229,7 +1236,7 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
                 return 0;
 
         case SIOCGOUTFILL:
-               if (put_user(sl->outfill, (int *)arg))
+               if (put_user(sl->outfill, p))
                        return -EFAULT;
                return 0;
        /* VSV changes end */
@@ -1254,6 +1261,7 @@ static int slip_ioctl(struct tty_struct *tty, struct file *file, unsigned int cm
 static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
 {
        struct slip *sl = (struct slip*)(dev->priv);
+       unsigned long *p = (unsigned long *)&rq->ifr_ifru;
 
        if (sl == NULL)         /* Allocation failed ?? */
                return -ENODEV;
@@ -1268,11 +1276,11 @@ static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
        switch(cmd){
         case SIOCSKEEPALIVE:
                /* max for unchar */
-                if (((unsigned int)((unsigned long)rq->ifr_data)) > 255) {
+                if ((unsigned)*p > 255) {
                        spin_unlock_bh(&sl->lock);
                        return -EINVAL;
                }
-               sl->keepalive = (unchar) ((unsigned long)rq->ifr_data);
+               sl->keepalive = (unchar) *p;
                if (sl->keepalive != 0) {
                        sl->keepalive_timer.expires=jiffies+sl->keepalive*HZ;
                        mod_timer(&sl->keepalive_timer, jiffies+sl->keepalive*HZ);
@@ -1283,15 +1291,15 @@ static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
                break;
 
         case SIOCGKEEPALIVE:
-               rq->ifr_data=(caddr_t)((unsigned long)sl->keepalive);
+               *p = sl->keepalive;
                break;
 
         case SIOCSOUTFILL:
-                if (((unsigned)((unsigned long)rq->ifr_data)) > 255) { /* max for unchar */
+                if ((unsigned)*p > 255) { /* max for unchar */
                        spin_unlock_bh(&sl->lock);
                        return -EINVAL;
                }
-                if ((sl->outfill = (unchar)((unsigned long) rq->ifr_data)) != 0){
+                if ((sl->outfill = (unchar)*p) != 0){
                        mod_timer(&sl->outfill_timer, jiffies+sl->outfill*HZ);
                        set_bit(SLF_OUTWAIT, &sl->flags);
                } else {
@@ -1300,7 +1308,7 @@ static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
                 break;
 
         case SIOCGOUTFILL:
-               rq->ifr_data=(caddr_t)((unsigned long)sl->outfill);
+               *p = sl->outfill;
                break;
 
         case SIOCSLEASE:
@@ -1312,12 +1320,12 @@ static int sl_ioctl(struct net_device *dev,struct ifreq *rq,int cmd)
                        return -EPERM;
                }
                sl->leased = 0;
-                if ((unsigned long)rq->ifr_data)
+                if (*p)
                        sl->leased = 1;
                 break;
 
         case SIOCGLEASE:
-               rq->ifr_data=(caddr_t)((unsigned long)sl->leased);
+               *p = sl->leased;
        };
        spin_unlock_bh(&sl->lock);
        return 0;