Re: [PATCH] poll/select: initialize triggered field of struct poll_wqueues

[Tejun Heo <tj@kernel.org>]

Guillaume Knispel wrote:
> poll/select: initialize triggered field of struct poll_wqueues
> 
> The triggered field of struct poll_wqueues introduced in commit
> 5f820f648c92a5ecc771a96b3c29aa6e90013bba "poll: allow f_op->poll to
> sleep" was set to 1 in pollwake() (now __pollwake() ), tested and
> later set to 0 in poll_schedule_timeout(), but not initialized before.
> As a result when the process needs to sleep, triggered was likely to be
> non-zero even if pollwake() is not called before the first
> poll_schedule_timeout(), meaning schedule_hrtimeout_range() would not
> be called and an extra loop calling all ->poll() would be done.
> 
> This patch initialize triggered to 0 in poll_initwait() so the ->poll()
> are not called twice before the process goes to sleep when it needs to.
> 
> Signed-off-by: Guillaume Knispel <gknispel@proformatique.com>

Ah... nice spotting.

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun