[PATCH 5.16 0759/1017] memstick/mspro_block: fix handling of read-only devices

Greg Kroah-Hartman
2022-04-05T13:23:38Z

From: Christoph Hellwig <hch@lst.de>

[ Upstream commit 6dab421bfe06a59bf8f212a72e34673e8acf2018 ]

Use set_disk_ro to propagate the read-only state to the block layer
instead of checking for it in ->open and leaking a reference in case
of a read-only device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220215094514.3828912-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/memstick/core/mspro_block.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index c0450397b673..7ea312f0840e 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -186,13 +186,8 @@ static int mspro_block_bd_open(struct block_device *bdev, fmode_t mode)

mutex_lock(&mspro_block_disk_lock);

- if (msb && msb->card) {
+ if (msb && msb->card)
msb->usage_count++;
- if ((mode & FMODE_WRITE) && msb->read_only)
- rc = -EROFS;
- else
- rc = 0;
- }

mutex_unlock(&mspro_block_disk_lock);

@@ -1239,6 +1234,9 @@ static int mspro_block_init_disk(struct memstick_dev *card)
set_capacity(msb->disk, capacity);
dev_dbg(&card->dev, "capacity set %ld\n", capacity);

+ if (msb->read_only)
+ set_disk_ro(msb->disk, true);
+
rc = device_add_disk(&card->dev, msb->disk, NULL);
if (rc)
goto out_cleanup_disk;
--
2.34.1