Re: [3.19.y-ckt stable] Patch "stmmac: fix check for phydev being open" has been added to staging queue

[Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>]

Hello.

On 10/20/2015 01:40 AM, Kamal Mostafa wrote:

> This is a note to let you know that I have just added a patch titled
>
>      stmmac: fix check for phydev being open
>
> to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
> which can be found at:
>
>      http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue
>
> This patch is scheduled to be released in version 3.19.8-ckt8.
>
> If you, or anyone else, feels it should not be added to this tree, please
> reply to this email.
>
> For more information about the 3.19.y-ckt tree, see
> https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

    Uh oh, it happened again... :-(
    NAK.

> Thanks.
> -Kamal
>
> ------
>
>  From ba01d7935fb4710b33ccc217b8e9a9cce88e1d75 Mon Sep 17 00:00:00 2001
> From: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
> Date: Wed, 9 Sep 2015 18:01:08 +0300
> Subject: stmmac: fix check for phydev being open
>
> commit dfc50fcaad574e5c8c85cbc83eca1426b2413fa4 upstream.
>
> Current check of phydev with IS_ERR(phydev) may make not much sense
> because of_phy_connect() returns NULL on failure instead of error value.

    of_phy_connect() insn't called yet in 3.19 as should be obvious from the 
patch context.

> Still for checking result of phy_connect() IS_ERR() makes perfect sense.
>
> So let's use combined check IS_ERR_OR_NULL() that covers both cases.
>
> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: David Miller <davem@davemloft.net>
> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> Signed-off-by: Kamal Mostafa <kamal@canonical.com>
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 8834b82..5b9d3f7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -829,8 +829,11 @@ static int stmmac_init_phy(struct net_device *dev)
>
>   	phydev = phy_connect(dev, phy_id_fmt, &stmmac_adjust_link, interface);
>
> -	if (IS_ERR(phydev)) {
> +	if (IS_ERR_OR_NULL(phydev)) {
>   		pr_err("%s: Could not attach to PHY\n", dev->name);
> +		if (!phydev)
> +			return -ENODEV;
> +
>   		return PTR_ERR(phydev);
>   	}
>
> --
> 1.9.1

MBR, Sergei