Re: [PATCH] dp83640: Ensure against premature access to PHY registers after reset

2018-04-10 Thread Sasha Levin 
Hi,

[This is an automated email]

This commit has been processed by the -stable helper bot and determined
to be a high probability candidate for -stable trees. (score: 6.8160)

The bot has tested the following trees: v4.16.1, v4.15.16, v4.14.33, v4.9.93, 
v4.4.127.

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v4.14.33: Build OK!
v4.9.93: Build OK!
v4.4.127: Build OK!

Please let us know if you'd like to have this patch included in a stable tree.

--
Thanks,
Sasha

Re: [PATCH] dp83640: Ensure against premature access to PHY registers after reset

2018-04-06 Thread Esben Haabendal 
David Miller  writes:

> From: Andrew Lunn 
> Date: Fri, 6 Apr 2018 16:14:10 +0200
>
>> On Fri, Apr 06, 2018 at 04:05:40PM +0200, Esben Haabendal wrote:
>>> From: Esben Haabendal 
>>> 
>>> Signed-off-by: Esben Haabendal 
>>> ---
>>>  drivers/net/phy/dp83640.c | 17 +
>>>  1 file changed, 17 insertions(+)
>>> 
>>> diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
>>> index 654f42d00092..48403170096a 100644
>>> --- a/drivers/net/phy/dp83640.c
>>> +++ b/drivers/net/phy/dp83640.c
>>> @@ -1207,6 +1207,22 @@ static void dp83640_remove(struct phy_device *phydev)
>>> kfree(dp83640);
>>>  }
>>>  
>>> +static int dp83640_soft_reset(struct phy_device *phydev)
>>> +{
>>> +   int ret;
>>> +
>>> +   ret = genphy_soft_reset(phydev);
>>> +   if (ret < 0)
>>> +   return ret;
>>> +
>>> +   /* From DP83640 datasheet: "Software driver code must wait 3 us
>>> +* following a software reset before allowing further serial MII
>>> +* operations with the DP83640." */
>>> +   udelay(3);
>> 
>> Hi Esben
>> 
>> The accuracy of udelay() is not guaranteed. So you probably want to be
>> a bit pessimistic, and use 10.

Ok, will do.

/Esben

Re: [PATCH] dp83640: Ensure against premature access to PHY registers after reset

2018-04-06 Thread David Miller 
From: Andrew Lunn 
Date: Fri, 6 Apr 2018 16:14:10 +0200

> On Fri, Apr 06, 2018 at 04:05:40PM +0200, Esben Haabendal wrote:
>> From: Esben Haabendal 
>> 
>> Signed-off-by: Esben Haabendal 
>> ---
>>  drivers/net/phy/dp83640.c | 17 +
>>  1 file changed, 17 insertions(+)
>> 
>> diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
>> index 654f42d00092..48403170096a 100644
>> --- a/drivers/net/phy/dp83640.c
>> +++ b/drivers/net/phy/dp83640.c
>> @@ -1207,6 +1207,22 @@ static void dp83640_remove(struct phy_device *phydev)
>>  kfree(dp83640);
>>  }
>>  
>> +static int dp83640_soft_reset(struct phy_device *phydev)
>> +{
>> +int ret;
>> +
>> +ret = genphy_soft_reset(phydev);
>> +if (ret < 0)
>> +return ret;
>> +
>> +/* From DP83640 datasheet: "Software driver code must wait 3 us
>> + * following a software reset before allowing further serial MII
>> + * operations with the DP83640." */
>> +udelay(3);
> 
> Hi Esben
> 
> The accuracy of udelay() is not guaranteed. So you probably want to be
> a bit pessimistic, and use 10.

Agreed.

Re: [PATCH] dp83640: Ensure against premature access to PHY registers after reset

2018-04-06 Thread Andrew Lunn 
On Fri, Apr 06, 2018 at 04:05:40PM +0200, Esben Haabendal wrote:
> From: Esben Haabendal 
> 
> Signed-off-by: Esben Haabendal 
> ---
>  drivers/net/phy/dp83640.c | 17 +
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
> index 654f42d00092..48403170096a 100644
> --- a/drivers/net/phy/dp83640.c
> +++ b/drivers/net/phy/dp83640.c
> @@ -1207,6 +1207,22 @@ static void dp83640_remove(struct phy_device *phydev)
>   kfree(dp83640);
>  }
>  
> +static int dp83640_soft_reset(struct phy_device *phydev)
> +{
> + int ret;
> +
> + ret = genphy_soft_reset(phydev);
> + if (ret < 0)
> + return ret;
> +
> + /* From DP83640 datasheet: "Software driver code must wait 3 us
> +  * following a software reset before allowing further serial MII
> +  * operations with the DP83640." */
> + udelay(3);

Hi Esben

The accuracy of udelay() is not guaranteed. So you probably want to be
a bit pessimistic, and use 10.

  Andrew