[PATCH 1/1] mmc: Check to disable IOCTL when card is mounted

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From: Shashidhar Hiremath <shashidharh@xxxxxxxxxxxxxxx>

The Patch adds a check to disable the IOCTL from running when the card is mounted
or device is opened elsewhere.

Signed-off-by: Shashidhar Hiremath <shashidharh@xxxxxxxxxxxxxxx>
---
 drivers/mmc/card/block.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 0cad48a..e680929 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -387,6 +387,12 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 		err = -EINVAL;
 		goto cmd_done;
 	}
+	/* Disallow the IOCTL run if card is already mounted or device is
+	 * opened elsewhere */
+	if (md->usage > 3) {
+		err = -EINVAL;
+		goto cmd_done;
+	}
 
 	card = md->queue.card;
 	if (IS_ERR(card)) {
-- 
1.7.6.4

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