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Subject: Re: [PATCH v2 2/2] net: dsa: qca: ar9331: export stats64
To:     Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        linux-mips@vger.kernel.org, Russell King <linux@armlinux.org.uk>,
        "David S. Miller" <davem@davemloft.net>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        netdev@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
        Vladimir Oltean <olteanv@gmail.com>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        linux-kernel@vger.kernel.org
References: <20201202120712.6212-1-o.rempel@pengutronix.de>
 <20201202120712.6212-3-o.rempel@pengutronix.de>
 <d3f790c6-d84c-f1bd-df6e-912ab64cce8c@pengutronix.de>
 <20201202124317.vehujtj2fdur2ed2@pengutronix.de>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Message-ID: <f80ea68e-9515-0d4e-b2e3-1ae9e8296cd0@pengutronix.de>
Date:   Wed, 2 Dec 2020 13:47:17 +0100
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In-Reply-To: <20201202124317.vehujtj2fdur2ed2@pengutronix.de>
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Content-Type: multipart/mixed; boundary="ELDSsYxouK1b603L4AP6U2LqdLxl6O2go";
 protected-headers="v1"
From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Andrew Lunn <andrew@lunn.ch>, Florian Fainelli <f.fainelli@gmail.com>,
 linux-mips@vger.kernel.org, Russell King <linux@armlinux.org.uk>,
 "David S. Miller" <davem@davemloft.net>,
 Pengutronix Kernel Team <kernel@pengutronix.de>, netdev@vger.kernel.org,
 Jakub Kicinski <kuba@kernel.org>, Vladimir Oltean <olteanv@gmail.com>,
 Vivien Didelot <vivien.didelot@gmail.com>, linux-kernel@vger.kernel.org
Message-ID: <f80ea68e-9515-0d4e-b2e3-1ae9e8296cd0@pengutronix.de>
Subject: Re: [PATCH v2 2/2] net: dsa: qca: ar9331: export stats64
References: <20201202120712.6212-1-o.rempel@pengutronix.de>
 <20201202120712.6212-3-o.rempel@pengutronix.de>
 <d3f790c6-d84c-f1bd-df6e-912ab64cce8c@pengutronix.de>
 <20201202124317.vehujtj2fdur2ed2@pengutronix.de>
In-Reply-To: <20201202124317.vehujtj2fdur2ed2@pengutronix.de>

--ELDSsYxouK1b603L4AP6U2LqdLxl6O2go
Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: quoted-printable

On 12/2/20 1:43 PM, Oleksij Rempel wrote:
>>> +struct ar9331_sw_priv;
>>> +struct ar9331_sw_port {
>>> +	int idx;
>>> +	struct ar9331_sw_priv *priv;
>>> +	struct delayed_work mib_read;
>>> +	struct ar9331_sw_stats stats;
>>> +	struct mutex lock;		/* stats access */
>>
>> What does the lock protect? It's only used a single time.
>=20
> The ar9331_read_stats() function is called from two different contests:=

> from worker over ar9331_do_stats_poll() and from user space over
> ar9331_get_stats64().
>=20
> The mutex lock should prevent a race in the read modify write operation=
s
> for in the stats->*

Makes sense!

Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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