netdev - Re: [PATCH net v2] ravb: Fix bit fields checking in ravb_hwtstamp

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Message-ID: <20201027171620.2b5eef40@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 27 Oct 2020 17:16:20 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Gabbasov <andrew_gabbasov@...tor.com>
Cc:     <linux-renesas-soc@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>, <geert+renesas@...der.be>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Dirk Behme <dirk.behme@...bosch.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>
Subject: Re: [PATCH net v2] ravb: Fix bit fields checking in
 ravb_hwtstamp_get()

On Mon, 26 Oct 2020 05:21:30 -0500 Andrew Gabbasov wrote:
> In the function ravb_hwtstamp_get() in ravb_main.c with the existing
> values for RAVB_RXTSTAMP_TYPE_V2_L2_EVENT (0x2) and RAVB_RXTSTAMP_TYPE_ALL
> (0x6)
> 
> if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
> 	config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
> else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
> 	config.rx_filter = HWTSTAMP_FILTER_ALL;
> 
> if the test on RAVB_RXTSTAMP_TYPE_ALL should be true,
> it will never be reached.
> 
> This issue can be verified with 'hwtstamp_config' testing program
> (tools/testing/selftests/net/hwtstamp_config.c). Setting filter type
> to ALL and subsequent retrieving it gives incorrect value:
> 
> $ hwtstamp_config eth0 OFF ALL
> flags = 0
> tx_type = OFF
> rx_filter = ALL
> $ hwtstamp_config eth0
> flags = 0
> tx_type = OFF
> rx_filter = PTP_V2_L2_EVENT
> 
> Correct this by converting if-else's to switch.
> 
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Reported-by: Julia Lawall <julia.lawall@...ia.fr>
> Signed-off-by: Andrew Gabbasov <andrew_gabbasov@...tor.com>
> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@...il.com>

Applied, thank you!