[SCSI] sd: fix issue_flush

sd_issue_flush() is called from atomic context so we can't use the
semaphore based routines to get a reference to the scsi_disk.  Assume
something else already got the reference so we can safely use it.

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

1 files changed, 9 insertions, 13 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index bb5b242ac6b4..8613a1317712 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -769,20 +769,16 @@ static void sd_end_flush(request_queue_t *q, struct request *flush_rq)
 static int sd_prepare_flush(request_queue_t *q, struct request *rq)
 {
         struct scsi_device *sdev = q->queuedata;
-        struct scsi_disk *sdkp = scsi_disk_get_from_dev(&sdev->sdev_gendev);
-        int ret = 0;
+        struct scsi_disk *sdkp = dev_get_drvdata(&sdev->sdev_gendev);
 
-        if (sdkp) {
-                if (sdkp->WCE) {
-                        memset(rq->cmd, 0, sizeof(rq->cmd));
-                        rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER;
-                        rq->timeout = SD_TIMEOUT;
-                        rq->cmd[0] = SYNCHRONIZE_CACHE;
-                        ret = 1;
-                }
-                scsi_disk_put(sdkp);
-        }
-        return ret;
+        if (!sdkp || !sdkp->WCE)
+                return 0;
+
+        memset(rq->cmd, 0, sizeof(rq->cmd));
+        rq->flags |= REQ_BLOCK_PC | REQ_SOFTBARRIER;
+        rq->timeout = SD_TIMEOUT;
+        rq->cmd[0] = SYNCHRONIZE_CACHE;
+        return 1;
 }
 
 static void sd_rescan(struct device *dev)