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authorBart Van Assche <bvanassche@acm.org>2012-06-29 19:33:22 +0400
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 11:58:40 +0400
commit67bd94130015c507011af37858989b199c52e1de (patch)
tree9b4bc8ef5c7180d920eae0f95158dc377c38df8c /drivers/scsi/scsi_priv.h
parente81ca6fe85b77109a32489a5db82f575d51dfc98 (diff)
downloadlinux-67bd94130015c507011af37858989b199c52e1de.tar.xz
[SCSI] Fix device removal NULL pointer dereference
Use blk_queue_dead() to test whether the queue is dead instead of !sdev. Since scsi_prep_fn() may be invoked concurrently with __scsi_remove_device(), keep the queuedata (sdev) pointer in __scsi_remove_device(). This patch fixes a kernel oops that can be triggered by USB device removal. See also http://www.spinics.net/lists/linux-scsi/msg56254.html. Other changes included in this patch: - Swap the blk_cleanup_queue() and kfree() calls in scsi_host_dev_release() to make that code easier to grasp. - Remove the queue dead check from scsi_run_queue() since the queue state can change anyway at any point in that function where the queue lock is not held. - Remove the queue dead check from the start of scsi_request_fn() since it is redundant with the scsi_device_online() check. Reported-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Tejun Heo <tj@kernel.org> Cc: <stable@kernel.org> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_priv.h')
-rw-r--r--drivers/scsi/scsi_priv.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index cbfe5df24a3b..291db6effffb 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -85,7 +85,6 @@ extern void scsi_next_command(struct scsi_cmnd *cmd);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
extern void scsi_run_host_queues(struct Scsi_Host *shost);
extern struct request_queue *scsi_alloc_queue(struct scsi_device *sdev);
-extern void scsi_free_queue(struct request_queue *q);
extern int scsi_init_queue(void);
extern void scsi_exit_queue(void);
struct request_queue;