linux-kernel - Re: [PATCH net-next 6/9] net: phy: add backplane kr driver support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 27 Mar 2020 15:28:15 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florinel Iordache <florinel.iordache@....com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, f.fainelli@...il.com,
        hkallweit1@...il.com, linux@...linux.org.uk,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com, kuba@...nel.org,
        corbet@....net, shawnguo@...nel.org, leoyang.li@....com,
        madalin.bucur@....nxp.com, ioana.ciornei@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 6/9] net: phy: add backplane kr driver support

> +/* Read AN Link Status */
> +static int is_an_link_up(struct phy_device *bpphy)
> +{
> +	struct backplane_phy_info *bp_phy = bpphy->priv;
> +	int ret, val = 0;
> +
> +	mutex_lock(&bp_phy->bpphy_lock);
> +
> +	/* Read twice because Link_Status is LL (Latched Low) bit */
> +	val = phy_read_mmd(bpphy, MDIO_MMD_AN, bp_phy->bp_dev.mdio.an_status);
> +	val = phy_read_mmd(bpphy, MDIO_MMD_AN, bp_phy->bp_dev.mdio.an_status);
> +
> +	mutex_unlock(&bp_phy->bpphy_lock);

How does this mutex interact with phydev->lock? It appears both are
trying to do the same thing, serialise access to the PHY hardware.

	 Andrew