[S390] tape block: complete request with correct locking

__blk_end_request must be called with request queue lock held. We need to use
blk_end_request rather than  __blk_end_request.

Signed-off-by: Frank Munzert <munzert@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 023803d..ae18baf 100644 (file)
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -76,7 +76,7 @@ tapeblock_trigger_requeue(struct tape_device *device)
 static void
 tapeblock_end_request(struct request *req, int error)
 {
-       if (__blk_end_request(req, error, blk_rq_bytes(req)))
+       if (blk_end_request(req, error, blk_rq_bytes(req)))
                BUG();
 }
 
@@ -166,7 +166,7 @@ tapeblock_requeue(struct work_struct *work) {
                nr_queued++;
        spin_unlock(get_ccwdev_lock(device->cdev));
 
-       spin_lock(&device->blk_data.request_queue_lock);
+       spin_lock_irq(&device->blk_data.request_queue_lock);
        while (
                !blk_queue_plugged(queue) &&
                elv_next_request(queue)   &&
@@ -176,7 +176,9 @@ tapeblock_requeue(struct work_struct *work) {
                if (rq_data_dir(req) == WRITE) {
                        DBF_EVENT(1, "TBLOCK: Rejecting write request\n");
                        blkdev_dequeue_request(req);
+                       spin_unlock_irq(&device->blk_data.request_queue_lock);
                        tapeblock_end_request(req, -EIO);
+                       spin_lock_irq(&device->blk_data.request_queue_lock);
                        continue;
                }
                blkdev_dequeue_request(req);