[PATCH v3 3/5] xen/blkfront: reorder tests in xlblk_init()
From: Juergen Gross <jgross@suse.com>
Date: 2018-08-13 14:01:48
Also in:
lkml
Subsystem:
block layer, the rest, xen block subsystem, xen hypervisor interface · Maintainers:
Jens Axboe, Linus Torvalds, Roger Pau Monné, Juergen Gross, Stefano Stabellini
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> --- drivers/block/xen-blkfront.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 7c4b1b9d3971..36e4ca41e765 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c@@ -2713,6 +2713,15 @@ 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;
@@ -2728,15 +2737,6 @@ 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);
--
2.13.7