Commit d667bff1 authored Nov 10, 2015 by Subhash Jadavani Committed by Xiaonian Wang Apr 07, 2017

mmc: core: kick cmdq thread after suspend

eMMC runtime suspend first puts the CMDQ to halt and then sets the card
state to suspended after sending out sleep command. If new requests get
queued after halting the CMDQ but before the card state has changed to
suspended then command queue thread will not be woken up again until
some new requests are queued to request queue. And if new request gets
queued, we will remain in this state forever. Fix this issue by kicking
the CMDQ thread after the suspend completion.

Change-Id: I37a03d9a75acf2ab3ebda57da87e246b449abf18
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>

parent 976e8cb3

drivers/mmc/core/mmc.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -2632,6 +2632,11 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
		host->dev_status = DEV_UNKNOWN;
		else if (is_suspend)
		host->dev_status = DEV_SUSPENDED;

		/* Kick CMDQ thread to process any requests came in while suspending */
		if (host->card->cmdq_init)
		wake_up(&host->cmdq_ctx.wait);

		mmc_release_host(host);
		return err;
		}