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authorMichael Buesch <mb@bu3sch.de>2009-01-06 14:43:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:31 -0800
commitf59abb161c955b68fd3d473368420c5919733e09 (patch)
treeb316a7acdbc2e2eb819614e61644249937903f47 /drivers/parport/ieee1284.c
parent50682bb4de35544466c264c017030de826614367 (diff)
downloadlinux-f59abb161c955b68fd3d473368420c5919733e09.tar.gz
parport: ieee1284: use del_timer_sync() in parport_wait_event()
Use del_timer_sync() instead of del_timer() to make sure the timer won't be running when we return from parport_wait_event(), because this would crash due to destruction of timer_list. This is untested and just based on a code review. Just think about the following sequence of events: - add_timer() - down_interruptible() is interrupted by a signal. - we enter the timer callback handler on another CPU. - del_timer(), but the timer callback is still running. - eturn from parport_wait_even, which destroys the automatic variable "timer" while the callback is running on another CPU. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/parport/ieee1284.c')
-rw-r--r--drivers/parport/ieee1284.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/parport/ieee1284.c b/drivers/parport/ieee1284.c
index ac2a805ac7ea..8901ecf6e037 100644
--- a/drivers/parport/ieee1284.c
+++ b/drivers/parport/ieee1284.c
@@ -84,7 +84,7 @@ int parport_wait_event (struct parport *port, signed long timeout)
add_timer (&timer);
ret = down_interruptible (&port->physport->ieee1284.irq);
- if (!del_timer (&timer) && !ret)
+ if (!del_timer_sync(&timer) && !ret)
/* Timed out. */
ret = 1;