linux-kernel - Re: [PATCH] igc: return an error if the mac type is unknown in igc_ptp_systim_to

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Message-ID: <Y8Q/1mFjuYXdJg/A@corigine.com>
Date:   Sun, 15 Jan 2023 19:03:02 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Tom Rix <trix@...hat.com>
Cc:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, richardcochran@...il.com, nathan@...nel.org,
        ndesaulniers@...gle.com, vinicius.gomes@...el.com,
        jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] igc: return an error if the mac type is unknown in
 igc_ptp_systim_to_hwtstamp()

On Sat, Jan 14, 2023 at 09:04:12AM -0500, Tom Rix wrote:
> clang static analysis reports
> drivers/net/ethernet/intel/igc/igc_ptp.c:673:3: warning: The left operand of
>   '+' is a garbage value [core.UndefinedBinaryOperatorResult]
>    ktime_add_ns(shhwtstamps.hwtstamp, adjust);
>    ^            ~~~~~~~~~~~~~~~~~~~~
> 
> igc_ptp_systim_to_hwtstamp() silently returns without setting the hwtstamp
> if the mac type is unknown.  This should be treated as an error.
> 
> Fixes: 81b055205e8b ("igc: Add support for RX timestamping")
> Signed-off-by: Tom Rix <trix@...hat.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>