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mmc: core: Fix deadlock when the CONFIG_MMC_UNSAFE_RESUME is not defined

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mmc_suspend_host() tries to claim host during suspend
and release it only when the bus suspend operation is
compeleted. If CONFIG_MMC_UNSAFE_RESUME is defined and
the host is flagged as removable, mmc_suspend_host()
tries to remove the card. In this process, the file system
sync can get blocked trying to acquire host which is already
claimed by mmc_suspend_host() causing deadlock.

Fix this deadlock by releasing host before ->remove() is called.

Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Acked-by: Ulf Hansson <ulf.hansson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Sujit Reddy Thumma 2011-11-23 08:43:18 +05:30 committed by Chris Ball
parent 524bfca2b4
commit 49df780749
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/core/core.c
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@ -2333,6 +2333,8 @@ int mmc_suspend_host(struct mmc_host *host)
mmc_poweroff_notify(host);
err = host->bus_ops->suspend(host);
}
mmc_do_release_host(host);
if (err == -ENOSYS || !host->bus_ops->resume) {
/*
* We simply "remove" the card in this case.
@ -2347,7 +2349,6 @@ int mmc_suspend_host(struct mmc_host *host)
host->pm_flags = 0;
err = 0;
}
mmc_do_release_host(host);
} else {
err = -EBUSY;
}