mmc: add a might_sleep() to mmc_claim_host()

In the normal case, the host lock can be claimed directly.
When it cannot, the caller will sleep. Make sure we don't
have any latent bugs by always calling might_sleep().

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index e08aa352bd50..3208890b10b3 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -260,6 +260,8 @@ void mmc_claim_host(struct mmc_host *host)
         DECLARE_WAITQUEUE(wait, current);
         unsigned long flags;
 
+        might_sleep();
+
         add_wait_queue(&host->wq, &wait);
         spin_lock_irqsave(&host->lock, flags);
         while (1) {