updates for CFQ oops fix

- add a comment to the device structure that the device_busy field
  is now protected by the request_queue->queue_lock
- null out sdev->request_queue after the queue is released to trap
  any (and there shouldn't be any) use after the queue is freed.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 134d3a3e4222..e75ee4671ee3 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -171,6 +171,9 @@ void scsi_device_dev_release(struct device *dev)
         if (sdev->request_queue) {
                 sdev->request_queue->queuedata = NULL;
                 scsi_free_queue(sdev->request_queue);
+                /* temporary expedient, try to catch use of queue lock
+                 * after free of sdev */
+                sdev->request_queue = NULL;
         }
 
         scsi_target_reap(scsi_target(sdev));