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

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Date: Sat, 11 May 2024 18:53:27 +0100
From: Simon Horman <horms@...nel.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	"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: Re: [PATCH net-next] virtio_net: Fix error code in
 __virtnet_get_hw_stats()

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.
> 
> 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>

Hi Dan, all,

Strictly this is doing two things.  But I agree that the "ok" variable in
virtnet_get_hw_stats() was very confusing, and I'm not sure how long it
would have taken me to grasp the fix without that change being here too.

Reviewed-by: Simon Horman <horms@...nel.org>