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| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2011-05-25 22:52:14 +0200 |
|---|---|---|
| committer | James Bottomley <jbottomley@parallels.com> | 2011-06-02 11:34:43 +0200 |
| commit | e73e079bf128d68284efedeba1fbbc18d78610f9 (patch) | |
| tree | 7477ba6759346155bb784e9719fe68bab89ee88e /drivers/scsi/scsi_sysfs.c | |
| parent | Revert "mm: fail GFP_DMA allocations when ZONE_DMA is not configured" (diff) | |
| download | linux-e73e079bf128d68284efedeba1fbbc18d78610f9.tar.xz linux-e73e079bf128d68284efedeba1fbbc18d78610f9.zip | |
[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>
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index e63912510fb9..e0bd3f790fca 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -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; |