linux-kernel - [PATCH net-next] virtio_net: Fix error code in __virtnet_get_hw

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Date: Fri, 10 May 2024 15:50:45 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	virtualization@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] virtio_net: Fix error code in
 __virtnet_get_hw_stats()

The virtnet_send_command_reply() function returns true on success or
false on failure.  The "ok" variable is true/false depending on whether
it succeeds or not.  It's up to the caller to translate the true/false
into -EINVAL on failure or zero for success.

The bug is that __virtnet_get_hw_stats() returns false for both
errors and success.  It's not a bug, but it is confusing that the caller
virtnet_get_hw_stats() uses an "ok" variable to store negative error
codes.

Fix the bug and clean things up so that it's clear that
__virtnet_get_hw_stats() returns zero on success or negative error codes
on failure.

Fixes: 941168f8b40e ("virtio_net: support device stats")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/net/virtio_net.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 218a446c4c27..4fc0fcdad259 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -4016,7 +4016,7 @@ static int __virtnet_get_hw_stats(struct virtnet_info *vi,
 					&sgs_out, &sgs_in);
 
 	if (!ok)
-		return ok;
+		return -EINVAL;
 
 	for (p = reply; p - reply < res_size; p += le16_to_cpu(hdr->size)) {
 		hdr = p;
@@ -4053,7 +4053,7 @@ static int virtnet_get_hw_stats(struct virtnet_info *vi,
 	struct virtio_net_ctrl_queue_stats *req;
 	bool enable_cvq;
 	void *reply;
-	int ok;
+	int err;
 
 	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS))
 		return 0;
@@ -4100,12 +4100,12 @@ static int virtnet_get_hw_stats(struct virtnet_info *vi,
 	if (enable_cvq)
 		virtnet_make_stat_req(vi, ctx, req, vi->max_queue_pairs * 2, &j);
 
-	ok = __virtnet_get_hw_stats(vi, ctx, req, sizeof(*req) * j, reply, res_size);
+	err = __virtnet_get_hw_stats(vi, ctx, req, sizeof(*req) * j, reply, res_size);
 
 	kfree(req);
 	kfree(reply);
 
-	return ok;
+	return err;
 }
 
 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)