netdev - Re: [PATCH net-next] e100: Fix passing zero to 'PTR_ERR' warning in e100_load_ucode

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Date:   Tue, 20 Nov 2018 16:03:18 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     YueHaibing <yuehaibing@...wei.com>, davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH net-next] e100: Fix passing zero to 'PTR_ERR' warning in
 e100_load_ucode_wait

On Mon, 2018-11-19 at 20:48 +0800, YueHaibing wrote:
> Fix a static code checker warning:
> drivers/net/ethernet/intel/e100.c:1349
>  e100_load_ucode_wait() warn: passing zero to 'PTR_ERR'
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/net/ethernet/intel/e100.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

This looks fine, I am just concerned of the regression testing needed on
hardware that is almost 20 years old now.  The availability of the hardware
for testing is also a concern.

> diff --git a/drivers/net/ethernet/intel/e100.c
> b/drivers/net/ethernet/intel/e100.c
> index 7c4b554..736115b 100644
> --- a/drivers/net/ethernet/intel/e100.c
> +++ b/drivers/net/ethernet/intel/e100.c
> @@ -1345,8 +1345,8 @@ static inline int e100_load_ucode_wait(struct nic
> *nic)
>  
>  	fw = e100_request_firmware(nic);
>  	/* If it's NULL, then no ucode is required */
> -	if (!fw || IS_ERR(fw))
> -		return PTR_ERR(fw);
> +	if (IS_ERR_OR_NULL(fw))
> +		return PTR_ERR_OR_ZERO(fw);
>  
>  	if ((err = e100_exec_cb(nic, (void *)fw, e100_setup_ucode)))
>  		netif_err(nic, probe, nic->netdev,


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