mmc: sdio: ensure mmc_sdio_detect is powered

To prevent an erroneous removal of the card, make sure
the device is powered when it is mmc_sdio_detect()ed.

This is required since mmc_sdio_detect may be invoked
while the device is runtime suspended (e.g., MMC core
is rescanning when system comes out of suspend).

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Tested-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 85561dd..c3ad105 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -546,6 +546,11 @@ static void mmc_sdio_detect(struct mmc_host *host)
        BUG_ON(!host);
        BUG_ON(!host->card);
 
+       /* Make sure card is powered before detecting it */
+       err = pm_runtime_get_sync(&host->card->dev);
+       if (err < 0)
+               goto out;
+
        mmc_claim_host(host);
 
        /*
@@ -555,6 +560,7 @@ static void mmc_sdio_detect(struct mmc_host *host)
 
        mmc_release_host(host);
 
+out:
        if (err) {
                mmc_sdio_remove(host);
 
@@ -562,6 +568,9 @@ static void mmc_sdio_detect(struct mmc_host *host)
                mmc_detach_bus(host);
                mmc_release_host(host);
        }
+
+       /* Tell PM core that we're done */
+       pm_runtime_put(&host->card->dev);
 }
 
 /*