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authorAlasdair G Kergon <agk@redhat.com>2009-04-02 19:55:28 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-04-02 19:55:28 +0100
commit570b9d968bf9b16974252ef7cbce73fa6dac34f3 (patch)
tree1a356ada71b373b363f9fc2204769f8eee920f30 /drivers/md/dm-target.c
parentaea9058801c0acfa2831af1714da412dfb0018c2 (diff)
dm table: fix upgrade mode race
upgrade_mode() sets bdev to NULL temporarily, and does not have any locking to exclude anything from seeing that NULL. In dm_table_any_congested() bdev_get_queue() can dereference that NULL and cause a reported oops. Fix this by not changing that field during the mode upgrade. Cc: stable@kernel.org Cc: Neil Brown <neilb@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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