netdev - Re: [PATCH 2/2] MPC52xx FEC: be more conservative when setting MII

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Wed, 15 Jul 2009 11:18:59 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Wolfgang Denk <wd@...x.de>
Cc:	linuxppc-dev@...abs.org, Kumar Gala <galak@...nel.crashing.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] MPC52xx FEC: be more conservative when setting 
	MII_SPEED register

On Wed, Jul 15, 2009 at 9:18 AM, Wolfgang Denk<wd@...x.de> wrote:
> This patch adds error checking and prevents clobbering unrelated bits
> (reserved bits or the DIS_PREAMBLE bit) when writing the MII_SPEED
> register on MPC52xx systems.
>
> Signed-off-by: Wolfgang Denk <wd@...x.de>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Kumar Gala <galak@...nel.crashing.org>
> Cc: <netdev@...r.kernel.org>

As I mentioned in the other patch, I don't want the 5121 and 5200 FEC
devices using common code for this.  It is a tiny block of code and
they are different devices.  Just open code the needed calculation
into this driver.

g.

> ---
>  drivers/net/fec_mpc52xx.c     |    2 +-
>  drivers/net/fec_mpc52xx_phy.c |    6 ++++--
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/fec_mpc52xx.c b/drivers/net/fec_mpc52xx.c
> index cc78633..b69d440 100644
> --- a/drivers/net/fec_mpc52xx.c
> +++ b/drivers/net/fec_mpc52xx.c
> @@ -639,7 +639,7 @@ static void mpc52xx_fec_hw_init(struct net_device *dev)
>        /* set phy speed.
>         * this can't be done in phy driver, since it needs to be called
>         * before fec stuff (even on resume) */
> -       out_be32(&fec->mii_speed, priv->mdio_speed);
> +       clrsetbits_be32(&fec->mii_speed, 0x7E, priv->mdio_speed);
>  }
>
>  /**
> diff --git a/drivers/net/fec_mpc52xx_phy.c b/drivers/net/fec_mpc52xx_phy.c
> index 31e6d62..f733d43 100644
> --- a/drivers/net/fec_mpc52xx_phy.c
> +++ b/drivers/net/fec_mpc52xx_phy.c
> @@ -105,8 +105,10 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of,
>        dev_set_drvdata(dev, bus);
>
>        /* set MII speed */
> -       out_be32(&priv->regs->mii_speed,
> -               ((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
> +       i = mpc5xxx_get_mii_speed(of);
> +       if (i<0)
> +               goto out_unmap;
> +       clrsetbits_be32(&priv->regs->mii_speed, 0x7E, i);
>
>        err = of_mdiobus_register(bus, np);
>        if (err)
> --
> 1.6.0.6
>
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html