netdev - [PATCH 2/2] vhost_net: introduce vhost_net_set_backend

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Date:   Mon,  7 Sep 2020 18:52:20 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH 2/2] vhost_net: introduce vhost_net_set_backend_features()

This commit introduced a new function
vhost_net_set_backend_features() which is a wrap of
vhost_set_backend_features() with necessary mutex lockings.

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vhost/net.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 531a00d703cd..e01da77538c8 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1679,6 +1679,13 @@ static long vhost_net_set_owner(struct vhost_net *n)
 	return r;
 }
 
+static void vhost_net_set_backend_features(struct vhost_dev *dev, u64 features)
+{
+	mutex_lock(&dev->mutex);
+	vhost_set_backend_features(dev, features);
+	mutex_unlock(&dev->mutex);
+}
+
 static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
 			    unsigned long arg)
 {
@@ -1715,7 +1722,7 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
 			return -EFAULT;
 		if (features & ~VHOST_NET_BACKEND_FEATURES)
 			return -EOPNOTSUPP;
-		vhost_set_backend_features(&n->dev, features);
+		vhost_net_set_backend_features(&n->dev, features);
 		return 0;
 	case VHOST_RESET_OWNER:
 		return vhost_net_reset_owner(n);
-- 
2.18.4