linux-kernel - [PATCH RFC] virtio_ring: fix delayed enable cb implementation

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Message-ID: <20110519171246.GA8650@redhat.com>
Date:	Thu, 19 May 2011 20:12:47 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	rusty@...tcorp.com.au, habanero@...ux.vnet.ibm.com,
	Shirley Ma <mashirle@...ibm.com>,
	Krishna Kumar2 <krkumar2@...ibm.com>, kvm@...r.kernel.org,
	steved@...ibm.com, Tom Lendacky <tahm@...ux.vnet.ibm.com>,
	borntraeger@...ibm.com, avi@...hat.com
Cc:	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH RFC] virtio_ring: fix delayed enable cb implementation

Fix some signed/assigned mistakes in virtqueue_enable_cb_delayed
by using u16 math all over.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

---

I'll put this on my v1 branch as well

@@ -398,7 +397,7 @@ EXPORT_SYMBOL_GPL(virtqueue_enable_cb);
 bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
-	int bufs;
+	u16 bufs;
 
 	START_USE(vq);
 
@@ -412,7 +411,7 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
 	bufs = (vq->vring.avail->idx - vq->last_used_idx) * 3 / 4;
 	vring_used_event(&vq->vring) = vq->last_used_idx + bufs;
 	virtio_mb();
-	if (unlikely(vq->vring.used->idx - vq->last_used_idx > bufs)) {
+	if (unlikely((u16)(vq->vring.used->idx - vq->last_used_idx) > bufs)) {
 		END_USE(vq);
 		return false;
 	}
 
-- 
1.7.5.53.gc233e
--
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