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Commit 50a50f92 authored by Mika Westerberg's avatar Mika Westerberg Committed by Chris Ball
Browse files

mmc: core: use non-reentrant workqueue for clock gating 



The default multithread workqueue can cause the same work to be executed
concurrently on a different CPUs. This isn't really suitable for clock
gating as it might already gated the clock and gating it twice results both
host->clk_old and host->ios.clock to be set to 0.

To prevent this from happening we use system_nrt_wq instead.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarChris Ball <cjb@laptop.org>
Cc: <stable@kernel.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 778e277c

drivers/mmc/core/host.c

+1 −1
Original line number Diff line number Diff line
@@ -179,7 +179,7 @@ void mmc_host_clk_release(struct mmc_host *host) 
	host->clk_requests--;

	if (mmc_host_may_gate_card(host->card) &&

	    !host->clk_requests)

		schedule_work(&host->clk_gate_work);

		queue_work(system_nrt_wq, &host->clk_gate_work);

	spin_unlock_irqrestore(&host->clk_lock, flags);

}