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[SCSI] Fix oops caused by queue refcounting failure 

In certain circumstances, we can get an oops from a torn down device.
Most notably this is from CD roms trying to call scsi_ioctl.  The root
cause of the problem is the fact that after scsi_remove_device() has
been called, the queue is fully torn down.  This is actually wrong
since the queue can be used until the sdev release function is called.
Therefore, we add an extra reference to the queue which is released in
sdev->release, so the queue always exists.

Reported-by: Parag Warudkar <parag.lkml@gmail.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <jbottomley@parallels.com>
hifive-unleashed-5.1
James Bottomley 2011-05-25 15:52:14 -05:00 committed by James Bottomley
parent 1fa7b6a29c
commit e73e079bf1
2 changed files with 2 additions and 1 deletions
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2
drivers/scsi/scsi_scan.c
View File

@ -297,7 +297,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
kfree(sdev);
goto out;
}
blk_get_queue(sdev->request_queue);
sdev->request_queue->queuedata = sdev;
scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);

1
drivers/scsi/scsi_sysfs.c
View File

@ -322,6 +322,7 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
kfree(evt);
}
blk_put_queue(sdev->request_queue);
/* NULL queue means the device can't be used */
sdev->request_queue = NULL;