Re: [PATCH] net: fec: normalize return value of pm_runtime_get_sync() in MDIO write

From: David Miller
Date: Sun Sep 06 2015 - 01:04:37 EST

From: "Maciej S. Szmigiero" <mail@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 03 Sep 2015 21:38:30 +0200

> If fec MDIO write method succeeds its return value comes from
> call to pm_runtime_get_sync().
> But pm_runtime_get_sync() can also return 1.
> In case of Micrel KSZ9031 PHY this value will then
> be returned along the call chain of phy_write() ->
> ksz9031_extended_write() -> ksz9031_center_flp_timing() ->
> ksz9031_config_init() -> phy_init_hw() -> phy_attach_direct() ->
> phy_connect_direct().
> Then phy_connect() will cast it into a pointer using ERR_PTR(),
> which then fec_enet_mii_probe() will try to dereference
> resulting in an oops.
> Fix it by normalizing return value of pm_runtime_get_sync()
> to be zero if positive in MDIO write method.
> Signed-off-by: Maciej Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx>

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