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authorAnna Lemehova <EXT-Anna.Lemehova@nokia.com>2010-01-08 14:42:58 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-18 10:19:34 -0800
commit0798abf9dc8157145d7136f751b6a16aaac1b1e8 (patch)
treeb5251d1a8ad7e95f715d70d0e8d51b13a33a52bb
parent0696a3b5e0bb2b214b4b8293ce214f3a2e113bda (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>
-rw-r--r--drivers/mmc/card/block.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 85f0e8cd875..5988573bb84 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);