This is a note to let you know that we have just queued up the patch titled
Subject: mmc_block: add dev_t initialization check
to the 2.6.32-stable tree. Its filename is
mmc_block-add-dev_t-initialization-check.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From 7d92df692994472cab6045bbd9d0e2c4afa4365f Mon Sep 17 00:00:00 2001
From: Anna Lemehova <[email protected]>
Date: Fri, 8 Jan 2010 14:42:58 -0800
Subject: mmc_block: add dev_t initialization check
From: Anna Lemehova <[email protected]>
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 <[email protected]>
Signed-off-by: Adrian Hunter <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/mmc/card/block.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -85,7 +85,12 @@ static void mmc_blk_put(struct mmc_blk_d
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);
Patches currently in stable-queue which might be from
[email protected] are
queue-2.6.32/mmc_block-add-dev_t-initialization-check.patch
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