linux-kernel - Re: [PATCH] net: netxen: report error on version offset reading

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Message-ID: <20230329185907.GE831478@unreal>
Date:   Wed, 29 Mar 2023 21:59:07 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Denis Plotnikov <den-plotnikov@...dex-team.ru>
Cc:     GR-Linux-NIC-Dev@...vell.com, manishc@...vell.com,
        rahulv@...vell.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH] net: netxen: report error on version offset reading

On Wed, Mar 29, 2023 at 07:26:29PM +0300, Denis Plotnikov wrote:
> A static analyzer complains for non-checking the function returning value.
> Although, the code looks like not expecting any problems with version
> reading on netxen_p3_has_mn call, it seems the error still may happen.
> So, at least, add error reporting to ease problems investigation.
> 
> Signed-off-by: Denis Plotnikov <den-plotnikov@...dex-team.ru>
> ---
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> index 35ec9aab3dc7b..92962dbb73ad0 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> @@ -1192,8 +1192,13 @@ netxen_p3_has_mn(struct netxen_adapter *adapter)
>  	if (NX_IS_REVISION_P2(adapter->ahw.revision_id))
>  		return 1;
>  
> -	netxen_rom_fast_read(adapter,
> -			NX_FW_VERSION_OFFSET, (int *)&flashed_ver);
> +	if (netxen_rom_fast_read(adapter,
> +			NX_FW_VERSION_OFFSET, (int *)&flashed_ver)) {

1. Mo callers of netxen_rom_fast_read() print debug messages, so this
shouldn't too.
2. netxen_p3_has_mn() can't fail and by returning 0, you will cause to
unpredictable behaviour in netxen_validate_firmware().

Thanks

> +		printk(KERN_ERR "%s: ERROR on flashed version reading",
> +				netxen_nic_driver_name);
> +		return 0;
> +	}
> +
>  	flashed_ver = NETXEN_DECODE_VERSION(flashed_ver);
>  
>  	if (flashed_ver >= NETXEN_VERSION_CODE(4, 0, 220)) {
> -- 
> 2.25.1
>