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authorJiri Slaby <jslaby@suse.cz>2012-05-05 22:49:10 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-05 16:21:21 -0700
commit49a5f3cf6a956360bb43e5f8d0c592a8daea8ebd (patch)
tree195c877875e18f5ab4280f4227104f958bfa5251
parent1c2f95480648ed7326ab2288ca0e2d35551db4be (diff)
TTY: pdc_cons, fix regression in close
The test in pdc_console_tty_close '!tty->count' was always wrong because tty->count is decremented after tty->ops->close is called and thus can never be zero. Hence the 'then' branch was never executed and the timer never deleted. This did not matter until commit 5dd5bc40f3b6 ("TTY: pdc_cons, use tty_port"). There we needed to set TTY in tty_port to NULL, but this never happened due to the bug above. So change the test to really trigger at the last close by changing the condition to 'tty->count == 1'. Well, the driver should not touch tty->count at all. It should use tty_port->count and count open count there itself. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Reported-and-tested-by: Mikulas Patocka <mpatocka@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/parisc/kernel/pdc_cons.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index 4f004596a6e7..0b3393381a81 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -104,7 +104,7 @@ static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
{
- if (!tty->count) {
+ if (tty->count == 1) {
del_timer_sync(&pdc_console_timer);
tty_port_tty_set(&tty_port, NULL);
}