From: Shashidhar Hiremath <shashidh...@vayavyalabs.com>
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 <shashidh...@vayavyalabs.com>
---
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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