On Fri, 25 Apr 2014, James Bottomley wrote:
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 65a123d..9db097a 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -137,6 +137,7 @@ static void __scsi_queue_insert(struct scsi_cmnd *cmd,
> int reason, int unbusy)
> * lock such that the kblockd_schedule_work() call happens
> * before blk_cleanup_queue() finishes.
> */
> + cmd->result = 0;
> spin_lock_irqsave(q->queue_lock, flags);
> blk_requeue_request(q, cmd->request);
> kblockd_schedule_work(q, &device->requeue_work);
> @@ -1044,6 +1045,7 @@ static int scsi_init_sgtable(struct request *req,
> struct scsi_data_buffer *sdb,
> */
> int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask)
> {
> + struct scsi_device *sdev = cmd->device;
> struct request *rq = cmd->request;
>
> int error = scsi_init_sgtable(rq, &cmd->sdb, gfp_mask);
> @@ -1091,7 +1093,7 @@ err_exit:
> scsi_release_buffers(cmd);
> cmd->request->special = NULL;
> scsi_put_command(cmd);
> - put_device(&cmd->device->sdev_gendev);
> + put_device(&sdev->sdev_gendev);
> return error;
> }
> EXPORT_SYMBOL(scsi_init_io);
Hmm, I see why this is needed because of the scsi_put_command(cmd), but I
think you need to do struct scsi_device *sdev = ACCESS_ONCE(cmd->device)
instead to prevent gcc from messing with the code generation.
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