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>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index e08aa35..3208890 100644 (file)
--- 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) {