On Fri, May 10, 2024 at 03:50:45PM +0300, Dan Carpenter wrote:
> 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.
The bug is ... It's not a bug ....
I think what you are trying to say is that the error isn't
really handled anyway, except for printing a warning,
so it's not a big deal.
Right?
I don't know why can't get_ethtool_stats fail - we should
probably fix that.
> 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@xxxxxxxxxx>
> ---
> 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)
