diff options
| author | Sujit Reddy Thumma <sthumma@codeaurora.org> | 2011-11-23 04:13:18 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-12-10 22:18:39 +0100 |
| commit | 49df78074963c97e25debc3c67b72f059111607d (patch) | |
| tree | 8e5e8779f9c3228b5a04044bc077b78eac456fc2 /drivers/mmc | |
| parent | mmc: sdhci-s3c: Remove old and misprototyped suspend operations (diff) | |
| download | linux-49df78074963c97e25debc3c67b72f059111607d.tar.xz linux-49df78074963c97e25debc3c67b72f059111607d.zip | |
mmc: core: Fix deadlock when the CONFIG_MMC_UNSAFE_RESUME is not defined
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 271efeac860b..950b97d7412a 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -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; } |