Commit f0cc9cf9 authored by Ulf Hansson's avatar Ulf Hansson Committed by Chris Ball
Browse files

mmc: core: Detect card removal on I/O error 



To prevent I/O as soon as possible at card removal, a new detect work is
re-scheduled without a delay to let a rescan remove the card device as
soon as possible.

Additionally, MMC_CAP2_DETECT_ON_ERR can now be used to handle "slowly"
removed cards that a scheduled detect work did not detect as removed.
To prevent further I/O requests for these lingering removed cards,
check if card has been removed and then schedule a detect work to
properly remove it.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@stericsson.com>
Reviewed-by: default avatarNamjae Jeon <linkinjeon@gmail.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 885c3e80

drivers/mmc/core/core.c

+21 −3
Original line number Diff line number Diff line
@@ -2121,18 +2121,36 @@ int _mmc_detect_card_removed(struct mmc_host *host) 
int mmc_detect_card_removed(struct mmc_host *host)

{

	struct mmc_card *card = host->card;

	int ret;



	WARN_ON(!host->claimed);



	if (!card)

		return 1;



	ret = mmc_card_removed(card);

	/*

	 * The card will be considered unchanged unless we have been asked to

	 * detect a change or host requires polling to provide card detection.

	 */

	if (card && !host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))

		return mmc_card_removed(card);

	if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) &&

	    !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))

		return ret;



	host->detect_change = 0;

	if (!ret) {

		ret = _mmc_detect_card_removed(host);

		if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) {

			/*

			 * Schedule a detect work as soon as possible to let a

			 * rescan handle the card removal.

			 */

			cancel_delayed_work(&host->detect);

			mmc_detect_change(host, 0);

		}

	}



	return _mmc_detect_card_removed(host);

	return ret;

}

EXPORT_SYMBOL(mmc_detect_card_removed);

include/linux/mmc/host.h

+1 −0
Original line number Diff line number Diff line
@@ -258,6 +258,7 @@ struct mmc_host { 
#define MMC_CAP2_HS200		(MMC_CAP2_HS200_1_8V_SDR | \

				 MMC_CAP2_HS200_1_2V_SDR)

#define MMC_CAP2_BROKEN_VOLTAGE	(1 << 7)	/* Use the broken voltage */

#define MMC_CAP2_DETECT_ON_ERR	(1 << 8)	/* On I/O err check card removal */



	mmc_pm_flag_t		pm_caps;	/* supported pm features */

	unsigned int        power_notify_type;

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