[PATCH v2 3/4] mmc: core: Make host->card as NULL when card is removed

["Bao D. Nguyen" <nguyenb@codeaurora.org>]

From: Ritesh Harjani <riteshh@codeaurora.org>

Make host->card as NULL when card is removed otherwise
we do see some kernel crashes in async contexts,
where host->card is referred (as dangling pointer).

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/mmc/core/bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 74de3f2..e83821c 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -247,12 +247,15 @@ void mmc_unregister_driver(struct mmc_driver *drv)
 static void mmc_release_card(struct device *dev)
 {
 	struct mmc_card *card = mmc_dev_to_card(dev);
+	struct mmc_host *host = card->host;
 
 	sdio_free_common_cis(card);
 
 	kfree(card->info);
 
 	kfree(card);
+	if (host)
+		host->card = NULL;
 }
 
 /*
-- 
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