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omap hsmmc: fix a racing case between kmmcd and omap_hsmmc_suspend

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If suspend called when kmmcd is doing host->ops->disable, as kmmcd already
increased host->en_dis_recurs to 1, the mmc_host_enable in suspend
function will return directly without increase the nesting_cnt, which will
cause the followed register access carried out to the disabled host.

mmc_suspend_host will enable host itself.  No need to enable host before
it.  Also works on kmmcd will get flushed in mmc_suspend_host, enable host
after it will be safe.  So make the mmc_host_enable after it.

[cjb: rebase against current Linus]
Signed-off-by: Ethan <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Acked-by: Madhusudhan Chikkature <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ethan Du 2010-09-09 16:37:49 -07:00 • committed by Linus Torvalds
commit e7cb756fc3
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/omap_hsmmc.c
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@ -2323,8 +2323,8 @@ static int omap_hsmmc_suspend(struct device *dev)
}
}
cancel_work_sync(&host->mmc_carddetect_work);
mmc_host_enable(host->mmc);
ret = mmc_suspend_host(host->mmc);
mmc_host_enable(host->mmc);
if (ret == 0) {
omap_hsmmc_disable_irq(host);
OMAP_HSMMC_WRITE(host->base, HCTL,