linux-kernel - Re: [PATCH 1/2] net: phy: fix yt8511 clang uninitialized variable warning

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Date:   Tue, 25 May 2021 15:01:59 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/2] net: phy: fix yt8511 clang uninitialized variable
 warning

On Tue, May 25, 2021 at 08:26:14AM -0400, Peter Geis wrote:
> clang doesn't preinitialize variables. If phy_select_page failed and
> returned an error, phy_restore_page would be called with `ret` being
> uninitialized.
> Even though phy_restore_page won't use `ret` in this scenario,
> initialize `ret` to silence the warning.
> 
> Fixes: b1b41c047f73 ("net: phy: add driver for Motorcomm yt8511 phy")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Peter Geis <pgwipeout@...il.com>
> ---
>  drivers/net/phy/motorcomm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
> index 796b68f4b499..5795f446c528 100644
> --- a/drivers/net/phy/motorcomm.c
> +++ b/drivers/net/phy/motorcomm.c
> @@ -51,7 +51,7 @@ static int yt8511_write_page(struct phy_device *phydev, int page)
>  static int yt8511_config_init(struct phy_device *phydev)
>  {
>  	unsigned int ge, fe;
> -	int ret, oldpage;
> +	int oldpage, ret = 0;

Please keep to reverse Christmas tree.

With that fixed:

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew