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mmc: sdio: Allow sdio operations in other threads during sdio_add_func()

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This fixes a bug introduced by 807e8e4067 ("mmc: Fix sd/sdio/mmc
initialization frequency retries") that prevented SDIO drivers from
performing SDIO commands in their probe routines -- the above patch
called mmc_claim_host() before sdio_add_func(), which causes a deadlock
if an external SDIO driver calls sdio_claim_host().

Fix tested on an OLPC XO-1.75 with libertas on SDIO.

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Reviewed-and-Tested-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Dmitry Shmidt 2011-03-03 17:40:10 -05:00 committed by Chris Ball
parent 214d93b02c
commit 34497913f2
1 changed files with 1 additions and 2 deletions
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3
drivers/mmc/core/sdio.c
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@ -792,7 +792,6 @@ int mmc_attach_sdio(struct mmc_host *host)
*/
mmc_release_host(host);
err = mmc_add_card(host->card);
mmc_claim_host(host);
if (err)
goto remove_added;
@ -805,12 +804,12 @@ int mmc_attach_sdio(struct mmc_host *host)
goto remove_added;
}
mmc_claim_host(host);
return 0;
remove_added:
/* Remove without lock if the device has been added. */
mmc_release_host(host);
mmc_sdio_remove(host);
mmc_claim_host(host);
remove: