>From 96404dc52f2cfa73541ed221febf83e54d7556a9 Mon Sep 17 00:00:00 2001 From: Anna Lemehova <[email protected]> Date: Fri, 30 Oct 2009 10:45:54 +0100 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 <[email protected]> Signed-off-by: Adrian Hunter <[email protected]> --- 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 85f0e8c..5988573 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); -- 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
