ext4: check to make make sure bd_dev is set before dereferencing it
authorTheodore Ts'o <tytso@mit.edu>
Tue, 27 Jul 2010 15:56:08 +0000 (11:56 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Tue, 27 Jul 2010 15:56:08 +0000 (11:56 -0400)
There are some drivers which may not set bdev->bd_dev.  So make sure
it is non-NULL before dereferencing it.

Google-Bug-Id: 1773557

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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