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mmc: skip detection of nonremovable cards on rescan

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mmc_rescan() checks whether registered cards are still present before
skipping them, by calling the bus-specific ->detect() handler.

With buses that support runtime PM, the card may be powered off at
this point, so they need to be powered on and fully reinitialized before
->detect() executes.

This whole process is redundant with nonremovable cards; in those cases,
we can safely skip calling ->detect() and implicitly assume its success.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Ohad Ben-Cohen 2010-11-28 07:21:28 +02:00 committed by Chris Ball
parent 8f230f454f
commit 30201e7f3a
1 changed files with 6 additions and 2 deletions
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8
drivers/mmc/core/core.c
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@ -1506,8 +1506,12 @@ void mmc_rescan(struct work_struct *work)
mmc_bus_get(host);
/* if there is a card registered, check whether it is still present */
if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead)
/*
* if there is a _removable_ card registered, check whether it is
* still present
*/
if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
&& mmc_card_is_removable(host))
host->bus_ops->detect(host);
mmc_bus_put(host);