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 <[email protected]>
Acked-by: Ulf Hansson <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 271efea..950b97d 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2333,6 +2333,8 @@
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 @@
host->pm_flags = 0;
err = 0;
}
- mmc_do_release_host(host);
} else {
err = -EBUSY;
}
