commit: e73e079bf128d68284efedeba1fbbc18d78610f9 From: James Bottomley <[email protected]> Date: Wed, 25 May 2011 15:52:14 -0500 Subject: [PATCH] [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 <[email protected]> Cc: [email protected] Signed-off-by: James Bottomley <[email protected]> --- drivers/scsi/scsi_scan.c | 2 +- drivers/scsi/scsi_sysfs.c | 1 + 2 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 58584dc..44e8ca3 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -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); diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index e639125..e0bd3f7 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; _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
