From: Oleg Nesterov Date: Thu, 26 Apr 2007 22:45:32 +0000 (-0700) Subject: [WORKQUEUE]: cancel_delayed_work: use del_timer() instead of del_timer_sync() X-Git-Tag: v2.6.22-rc1~1128^2~31 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=071b638689464c6b39407025eedd810d5b5e6f5d;p=pandora-kernel.git [WORKQUEUE]: cancel_delayed_work: use del_timer() instead of del_timer_sync() del_timer_sync() buys nothing for cancel_delayed_work(), but it is less efficient since it locks the timer unconditionally, and may wait for the completion of the delayed_work_timer_fn(). cancel_delayed_work() == 0 means: before this patch: work->func may still be running or queued after this patch: work->func may still be running or queued, or delayed_work_timer_fn->__queue_work() in progress. The latter doesn't differ from the caller's POV, delayed_work_timer_fn() is called with _PENDING bit set. cancel_delayed_work() == 1 with this patch adds a new possibility: delayed_work->work was cancelled, but delayed_work_timer_fn is still running (this is only possible for the re-arming works on single-threaded workqueue). In this case the timer was re-started by work->func(), nobody else can do this. This in turn means that delayed_work_timer_fn has already passed __queue_work() (and wont't touch delayed_work) because nobody else can queue delayed_work->work. Signed-off-by: Oleg Nesterov Signed-Off-By: David Howells Signed-off-by: David S. Miller --- Reading git-diff-tree failed