---

yaml --- r: 356835 b: refs/heads/master c: b26ba22 h: refs/heads/master i: 356833: 16c50a8 356831: 27076e9 v: v3
git-mirror · Jan 9, 2013 · d608803 · d608803
1 parent 8fddf3c
commit d608803
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Showing 2 changed files with 9 additions and 6 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 73fa21ea4fc662a2e8e85f84c4ca3fcb55fa4da2
+refs/heads/master: b26ba22bb4f12289f9d5eb878c490e674934a197
diff --git a/trunk/drivers/s390/kvm/virtio_ccw.c b/trunk/drivers/s390/kvm/virtio_ccw.c
@@ -132,11 +132,14 @@ static int ccw_io_helper(struct virtio_ccw_device *vcdev,
 	unsigned long flags;
 	int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
 
-	spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
-	ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
-	if (!ret)
-		vcdev->curr_io |= flag;
-	spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
+	do {
+		spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
+		ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
+		if (!ret)
+			vcdev->curr_io |= flag;
+		spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
+		cpu_relax();
+	} while (ret == -EBUSY);
 	wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
 	return ret ? ret : vcdev->err;
 }