Commit 7d92df69 authored by Anna Lemehova's avatar Anna Lemehova Committed by Linus Torvalds

mmc_block: add dev_t initialization check

When a card is removed before mmc_blk_probe() has called add_disk(), then
the minor field is uninitialized and has value 0.  This caused
mmc_blk_put() to always release devidx 0 even if 0 was still in use.  Then
the next mmc_blk_probe() used the first free idx of 0, which oopses in
sysfs, since it is used by another card.
Signed-off-by: default avatarAnna Lemehova <EXT-Anna.Lemehova@nokia.com>
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@nokia.com>
Cc: <linux-mmc@vger.kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0a884223
......@@ -85,7 +85,12 @@ static void mmc_blk_put(struct mmc_blk_data *md)
mutex_lock(&open_lock);
md->usage--;
if (md->usage == 0) {
int devmaj = MAJOR(disk_devt(md->disk));
int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
if (!devmaj)
devidx = md->disk->first_minor >> MMC_SHIFT;
__clear_bit(devidx, dev_use);
put_disk(md->disk);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment