vserver 1.9.5.x5

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

diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index a567410..f5c918a 100644 (file)
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -19,7 +19,7 @@
  * PPP driver, written by Michael Callahan and Al Longyear, and
  * subsequently hacked by Paul Mackerras.
  *
- * ==FILEVERSION 20020217==
+ * ==FILEVERSION 20041108==
  */
 
 #include <linux/config.h>
@@ -210,7 +210,7 @@ static atomic_t ppp_unit_count = ATOMIC_INIT(0);
  * and the atomicity of find a channel and updating its file.refcnt
  * field.
  */
-static spinlock_t all_channels_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(all_channels_lock);
 static LIST_HEAD(all_channels);
 static LIST_HEAD(new_channels);
 static int last_channel_index;
@@ -412,6 +412,17 @@ static ssize_t ppp_read(struct file *file, char __user *buf,
                ret = 0;
                if (pf->dead)
                        break;
+               if (pf->kind == INTERFACE) {
+                       /*
+                        * Return 0 (EOF) on an interface that has no
+                        * channels connected, unless it is looping
+                        * network traffic (demand mode).
+                        */
+                       struct ppp *ppp = PF_TO_PPP(pf);
+                       if (ppp->n_channels == 0
+                           && (ppp->flags & SC_LOOP_TRAFFIC) == 0)
+                               break;
+               }
                ret = -EAGAIN;
                if (file->f_flags & O_NONBLOCK)
                        break;
@@ -491,6 +502,14 @@ static unsigned int ppp_poll(struct file *file, poll_table *wait)
                mask |= POLLIN | POLLRDNORM;
        if (pf->dead)
                mask |= POLLHUP;
+       else if (pf->kind == INTERFACE) {
+               /* see comment in ppp_read */
+               struct ppp *ppp = PF_TO_PPP(pf);
+               if (ppp->n_channels == 0
+                   && (ppp->flags & SC_LOOP_TRAFFIC) == 0)
+                       mask |= POLLIN | POLLRDNORM;
+       }
+
        return mask;
 }
 
@@ -1920,7 +1939,7 @@ ppp_register_channel(struct ppp_channel *chan)
 #endif /* CONFIG_PPP_MULTILINK */
        init_rwsem(&pch->chan_sem);
        spin_lock_init(&pch->downl);
-       pch->upl = RW_LOCK_UNLOCKED;
+       rwlock_init(&pch->upl);
        spin_lock_bh(&all_channels_lock);
        pch->file.index = ++last_channel_index;
        list_add(&pch->list, &new_channels);
@@ -2199,7 +2218,7 @@ ppp_ccp_closed(struct ppp *ppp)
 
 /* List of compressors. */
 static LIST_HEAD(compressor_list);
-static spinlock_t compressor_list_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(compressor_list_lock);
 
 struct compressor_entry {
        struct list_head list;
@@ -2559,7 +2578,8 @@ ppp_disconnect_channel(struct channel *pch)
                /* remove it from the ppp unit's list */
                ppp_lock(ppp);
                list_del(&pch->clist);
-               --ppp->n_channels;
+               if (--ppp->n_channels == 0)
+                       wake_up_interruptible(&ppp->file.rwait);
                ppp_unlock(ppp);
                if (atomic_dec_and_test(&ppp->file.refcnt))
                        ppp_destroy_interface(ppp);