[PATCH master 1/3] mci: core: reset number of parttions on card probe failure

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

mci_part_add records information about MMC hardware partitions and
increments mci->nr_parts by one afterwards.
If starting up the card succeeds, this information is then used to
call mci_register_partition for each added partition.

If card start up fails, registration will be skipped, but mci->nr_parts
is not reset. This means that repeatedly calling device_detect will
overflow the mci->part buffer and overwrite subsequent memory.

Fix this by setting mci->nr_parts to zero on error. We don't need to
touch mci->part as it will be overwritten by subsequent detect attempts.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/mci/mci-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index f6565b2b64dd..66ca98a414ce 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -2363,6 +2363,7 @@ static int mci_card_probe(struct mci *mci)
 		host->clock = 0;	/* disable the MCI clock */
 		mci_set_ios(mci);
 		regulator_disable(host->supply);
+		mci->nr_parts = 0;
 	}
 
 	return rc;
-- 
2.39.2