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[PATCH] tty_io.c balance tty_ldisc_ref()

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tty_ldisc_deref() should only be called when tty_ldisc_ref() succeeds
otherwise it triggers a BUG().  There's already a function
tty_ldisc_flush() that flushes properly.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dan Carpenter 2006-12-13 00:35:09 -08:00 committed by Linus Torvalds
parent a2db8dfce8
commit b3f13debd5
1 changed files with 1 additions and 6 deletions
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7
drivers/char/tty_io.c
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@ -3335,18 +3335,13 @@ static void __do_SAK(struct work_struct *work)
int session; int session;
int i; int i;
struct file *filp; struct file *filp;
struct tty_ldisc *disc;
struct fdtable *fdt; struct fdtable *fdt;
if (!tty) if (!tty)
return; return;
session = tty->session; session = tty->session;
/* We don't want an ldisc switch during this */ tty_ldisc_flush(tty);
disc = tty_ldisc_ref(tty);
if (disc && disc->flush_buffer)
disc->flush_buffer(tty);
tty_ldisc_deref(disc);
if (tty->driver->flush_buffer) if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty); tty->driver->flush_buffer(tty);