netdev - Re: [RFC PATCH 2/3] net: phy: call mdiobus

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:	Mon, 15 Jul 2013 16:46:05 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	netdev <netdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Lior Amsalem <alior@...vell.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Subject: Re: [RFC PATCH 2/3] net: phy: call mdiobus_scan() after adding a
 fixed PHY

Hello Thomas,

2013/7/15 Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>:
> The fixed_phy_add() function allows to register a fixed PHY. However,
> when this function gets called *after* fixed_mdio_bus_init() (which
> gets called at the module_init stage), then the fixed PHY is not
> registered into the phylib.
>
> In order to address this, we add a call to mdiobus_scan() in
> fixed_phy_add() to ensure that the PHY indeed gets registered into the
> phylib, even if the fixed_phy_add() is called after
> fixed_mdio_bus_init().
>
> This is needed because until now, the only code that was calling the
> fixed_add_phy() function was PowerPC-specific platform code, which
> could ensure that such fixed PHYs get registered before
> fixed_mdio_bus_init() is called.

arch/mips/ar7/platform.c also calls fixed_phy_add() early enough as
well to ensure that we do not need to rescan the MDIO bus. There is
also another user: arch/m68k/platform/coldfire/m5272.c

>
> However, with the new of_phy_register_fixed_link() function, device
> drivers can parse their 'fixed-link' property and register a fixed PHY
> at ->probe() time, which may happen after fixed_mdio_bus_init() is
> called.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

Reviewed-by: Florian Fainelli <florian@...nwrt.org>

> ---
>  drivers/net/phy/fixed.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
> index ba55adf..bd1e67a 100644
> --- a/drivers/net/phy/fixed.c
> +++ b/drivers/net/phy/fixed.c
> @@ -195,6 +195,8 @@ int fixed_phy_add(unsigned int irq, int phy_id,
>
>         list_add_tail(&fp->node, &fmb->phys);
>
> +       mdiobus_scan(fmb->mii_bus, phy_id);
> +
>         return 0;
>
>  err_regs:
> --
> 1.8.1.2
>



--
Florian
--
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