mmc: sdio: fix nasty oops in mmc_sdio_detect (4d0812c3) · Commits · 戴 / test

Power off the card in mmc_sdio_detect __before__ a potential error handler, which completely removes the card, executes, and only if the card was successfully powered on beforehand. While we're at it, use the _sync variant of the runtime PM put API, in order to ensure that the card is left powered off in case an error occurred, and the card is going to be removed. Reproduced and tested on the OLPC XO-1.5. Reported-by:

Daniel Drake <dsd@laptop.org> Signed-off-by:

Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by:

Chris Ball <cjb@laptop.org>

drivers/mmc/core/sdio.c

+13 −3

Original line number	Diff line number	Diff line
		@@ -560,6 +560,19 @@ static void mmc_sdio_detect(struct mmc_host *host)

		mmc_release_host(host);

		/*
		* Tell PM core it's OK to power off the card now.
		*
		* The _sync variant is used in order to ensure that the card
		* is left powered off in case an error occurred, and the card
		* is going to be removed.
		*
		* Since there is no specific reason to believe a new user
		* is about to show up at this point, the _sync variant is
		* desirable anyway.
		*/
		pm_runtime_put_sync(&host->card->dev);

		out:
		if (err) {
		mmc_sdio_remove(host);
		@@ -568,9 +581,6 @@ out:
		mmc_detach_bus(host);
		mmc_release_host(host);
		}

		/* Tell PM core that we're done */
		pm_runtime_put(&host->card->dev);
		}

		/*

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