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authorOhad Ben-Cohen <ohad@wizery.com>2010-11-28 06:21:28 +0100
committerChris Ball <cjb@laptop.org>2011-01-09 04:48:04 +0100
commit30201e7f3ac639fe98fcd25d40346b65dde9ecba (patch)
treee2abf06a8dbb1cd83d8eeefcaa65440861218dc9 /drivers/mmc
parentmmc: Add support for JMicron 388 SD/MMC controller (diff)
downloadlinux-30201e7f3ac639fe98fcd25d40346b65dde9ecba.tar.xz
linux-30201e7f3ac639fe98fcd25d40346b65dde9ecba.zip
mmc: skip detection of nonremovable cards on rescan
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/core.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 722af2dce3bb..9683d4d3fced 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -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);