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mISDN: fix race in timer canceling on module unloading 

Using timer_pending() without additional syncronization is racy,
del_timer_sync() must be used here for waiting in-flight handler.
Bug caught with help from "debug-objects" during random insmod/rmmod.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Konstantin Khlebnikov 2012-12-14 01:02:36 +00:00 committed by David S. Miller
parent 4008e97f86
commit 4a0ae7b0a9
1 changed files with 1 additions and 2 deletions
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3
drivers/isdn/mISDN/dsp_core.c
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@ -1217,8 +1217,7 @@ static void __exit dsp_cleanup(void)
{
mISDN_unregister_Bprotocol(&DSP);
if (timer_pending(&dsp_spl_tl))
del_timer(&dsp_spl_tl);
del_timer_sync(&dsp_spl_tl);
if (!list_empty(&dsp_ilist)) {
printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "