1 files changed, 25 insertions, 12 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 076e07c1da38..e9bba94fc898 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -268,6 +268,8 @@ static struct tty_buffer *tty_buffer_alloc(size_t size)
         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); */
@@ -298,6 +300,8 @@ static struct tty_buffer *tty_buffer_find(struct tty_struct *tty, size_t 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); */
@@ -335,6 +339,7 @@ int tty_buffer_request_room(struct tty_struct *tty, size_t size)
                         if (b != NULL) {
                                 b->next = n;
                                 b->active = 0;
+                                b->commit = b->used;
                         } else
                                 tty->buf.head = n;
                         tty->buf.tail = n;
@@ -1836,7 +1841,6 @@ static void release_dev(struct file * filp)
                 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) {
@@ -1864,6 +1868,7 @@ static void release_dev(struct file * filp)
 
                 printk(KERN_WARNING "release_dev: %s: read/write wait queue "
                                     "active!\n", tty_name(tty, buf));
+                up(&tty_sem);
                 schedule();
         }       
 
@@ -1872,8 +1877,6 @@ 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 "
@@ -1887,7 +1890,6 @@ 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
@@ -1932,6 +1934,8 @@ static void release_dev(struct file * filp)
                 read_unlock(&tasklist_lock);
         }
 
+        up(&tty_sem);
+
         /* check whether both sides are closing ... */
         if (!tty_closing || (o_tty && !o_tty_closing))
                 return;
@@ -2752,6 +2756,9 @@ static void flush_to_ldisc(void *private_)
         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 */
@@ -2765,16 +2772,20 @@ static void flush_to_ldisc(void *private_)
                 goto out;
         }
         spin_lock_irqsave(&tty->buf.lock, flags);
-        while((tbuf = tty->buf.head) != NULL && !tbuf->active) {
+        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;
-                spin_unlock_irqrestore(&tty->buf.lock, flags);
-                /* printk("Process buffer %p for %d\n", tbuf, tbuf->used); */
-                disc->receive_buf(tty, tbuf->char_buf_ptr,
-                                       tbuf->flag_buf_ptr,
-                                       tbuf->used);
-                spin_lock_irqsave(&tty->buf.lock, flags);
                 tty_buffer_free(tty, tbuf);
         }
         spin_unlock_irqrestore(&tty->buf.lock, flags);
@@ -2871,8 +2882,10 @@ void tty_flip_buffer_push(struct tty_struct *tty)
 {
         unsigned long flags;
         spin_lock_irqsave(&tty->buf.lock, flags);
-        if (tty->buf.tail != NULL)
+        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)