diff mbox series

[3/4] xen/blkfront: reorder tests in xlblk_init()

Message ID 20180806113403.24728-5-jgross@suse.com (mailing list archive)
State New, archived
Headers show
Series xen/blk: persistent grant rework | expand

Commit Message

Jürgen Groß Aug. 6, 2018, 11:34 a.m. UTC 
In case we don't want pv block devices we should not test parameters
for sanity and eventually print out error messages. So test precluding
conditions before checking parameters.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 drivers/block/xen-blkfront.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Comments

Roger Pau Monné Aug. 6, 2018, 4:18 p.m. UTC | #1 
On Mon, Aug 06, 2018 at 01:34:02PM +0200, Juergen Gross wrote:
> In case we don't want pv block devices we should not test parameters
> for sanity and eventually print out error messages. So test precluding
> conditions before checking parameters.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

Thanks, Roger.
diff mbox series

Patch

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 19feb8835fc4..f72d96384326 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2718,6 +2718,15 @@  static int __init xlblk_init(void)
 	if (!xen_domain())
 		return -ENODEV;
 
+	if (!xen_has_pv_disk_devices())
+		return -ENODEV;
+
+	if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
+		pr_warn("xen_blk: can't get major %d with name %s\n",
+			XENVBD_MAJOR, DEV_NAME);
+		return -ENODEV;
+	}
+
 	if (xen_blkif_max_segments < BLKIF_MAX_SEGMENTS_PER_REQUEST)
 		xen_blkif_max_segments = BLKIF_MAX_SEGMENTS_PER_REQUEST;
 
@@ -2733,15 +2742,6 @@  static int __init xlblk_init(void)
 		xen_blkif_max_queues = nr_cpus;
 	}
 
-	if (!xen_has_pv_disk_devices())
-		return -ENODEV;
-
-	if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
-		printk(KERN_WARNING "xen_blk: can't get major %d with name %s\n",
-		       XENVBD_MAJOR, DEV_NAME);
-		return -ENODEV;
-	}
-
 	INIT_DELAYED_WORK(&blkfront_work, blkfront_delay_work);
 
 	ret = xenbus_register_frontend(&blkfront_driver);