linux-kernel - [RFC 1/1] xen: block: correct setting for xen_blkif_max_ring

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Date:	Wed, 25 Nov 2015 18:26:01 +0800
From:	Peng Fan <van.freenix@...il.com>
To:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:	van.freenix@...il.com,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: [RFC 1/1] xen: block: correct setting for xen_blkif_max_ring_order

According to this piece code:
"
     pr_info("Invalid max_ring_order (%d), will use default max: %d.\n",
              xen_blkif_max_ring_order, XENBUS_MAX_RING_GRANT_ORDER);
"
if xen_blkif_max_ring_order is bigger that XENBUS_MAX_RING_GRANT_ORDER,
need to set xen_blkif_max_ring_order using XENBUS_MAX_RING_GRANT_ORDER,
but not 0.

Signed-off-by: Peng Fan <van.freenix@...il.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: David Vrabel <david.vrabel@...rix.com>
Cc: "Roger Pau Monné" <roger.pau@...rix.com>
---

Hi,

I am new to xen and reading related soure code, not sure whether
this is correct. Please comments.

Thanks

 drivers/block/xen-blkfront.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 0823a96..883b9fa 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2126,7 +2126,7 @@ static int __init xlblk_init(void)
 	if (xen_blkif_max_ring_order > XENBUS_MAX_RING_PAGE_ORDER) {
 		pr_info("Invalid max_ring_order (%d), will use default max: %d.\n",
 			xen_blkif_max_ring_order, XENBUS_MAX_RING_PAGE_ORDER);
-		xen_blkif_max_ring_order = 0;
+		xen_blkif_max_ring_order = XENBUS_MAX_RING_PAGE_ORDER;
 	}
 
 	if (!xen_has_pv_disk_devices())
-- 
2.6.2

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