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Commit 07bdfb8d authored by James Bottomley's avatar James Bottomley Committed by Herton Ronaldo Krzesinski
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block: add proper state guards to __elv_next_request



BugLink: http://bugs.launchpad.net/bugs/802383

commit 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae upstream.

blk_cleanup_queue() calls elevator_exit() and after this, we can't
touch the elevator without oopsing.  __elv_next_request() must check
for this state because in the refcounted queue model, we can still
call it after blk_cleanup_queue() has been called.

This was reported as causing an oops attributable to scsi.

Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarTim Gardner <tim.gardner@canonical.com>
parent 339defb7
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