diff options
| author | Anna Lemehova <EXT-Anna.Lemehova@nokia.com> | 2010-01-08 14:42:58 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-18 10:19:34 -0800 |
| commit | 0798abf9dc8157145d7136f751b6a16aaac1b1e8 (patch) | |
| tree | b5251d1a8ad7e95f715d70d0e8d51b13a33a52bb /drivers/mmc | |
| parent | 0696a3b5e0bb2b214b4b8293ce214f3a2e113bda (diff) | |
mmc_block: add dev_t initialization check
commit 7d92df692994472cab6045bbd9d0e2c4afa4365f upstream.
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: Anna Lemehova <EXT-Anna.Lemehova@nokia.com>
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/card/block.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 85f0e8cd875b..5988573bb843 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -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); |