From 7d92df692994472cab6045bbd9d0e2c4afa4365f Mon Sep 17 00:00:00 2001 From: Anna Lemehova Date: Fri, 8 Jan 2010 14:42:58 -0800 Subject: [PATCH] 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: Anna Lemehova Signed-off-by: Adrian Hunter Cc: Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/mmc/card/block.c | 5 +++++ 1 file changed, 5 insertions(+) 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);