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Message-ID: <CAG0bkvKTFqbhHh=MRdLQnHJpEs4agiZX+05spdkK_zu5-W+rAA@mail.gmail.com> Date: Fri, 6 Mar 2015 14:04:53 +0530 From: Naveen Kumar Parna <pnaveenkos@...il.com> To: Michal Hocko <mhocko@...e.cz> Cc: linux-kernel@...r.kernel.org Subject: Re: Synchronization mechanism between wait_for_completion_interruptible_timeout() & complete() Thanks Michal. Now I am clearing x->done to zero before wait_for_completion_interruptible_timeout. On Thu, Mar 5, 2015 at 6:53 PM, Michal Hocko <mhocko@...e.cz> wrote: > On Wed 04-03-15 18:46:43, Naveen Kumar Parna wrote: >> Hello, >> >> I have a question regarding the synchronization mechanism between >> wait_for_completion_interruptible_timeout() & complete(). I used >> complete() API in the ISR Tx interrupt path and >> wait_for_completion_interruptible_timeout() in struct file_operations >> .write method. >> >> Let assume a scenario in which Tx interrupt occurred and ISR called >> complete() API before any process actually blocked at write method on >> wait_for_completion_interruptible_timeout(). >> >> After a few milli seconds, a process called write() API. Does it gets >> blocked on wait_for_completion_interruptible_timeout() for completion >> of a specific task to be signaled from new Tx interrupt? > > No, see do_wait_for_common resp. complete and x->done handling. > > -- > Michal Hocko > SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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