linux-kernel - Re: [PATCH 5/5] net: phy: dp83867: Use unsigned variables to store unsigned properties

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Message-ID: <3a42c0cc-4a4b-e168-c03e-1cc13bd2f5d4@gmail.com>
Date:   Sat, 11 May 2019 14:32:28 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Trent Piepho <tpiepho@...inj.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH 5/5] net: phy: dp83867: Use unsigned variables to store
 unsigned properties

On 11.05.2019 12:41, Heiner Kallweit wrote:
> On 10.05.2019 23:46, Trent Piepho wrote:
>> The variables used to store u32 DT properties were signed ints.  This
>> doesn't work properly if the value of the property were to overflow.
>> Use unsigned variables so this doesn't happen.
>>
> In patch 3 you added a check for DT properties being out of range.
> I think this would be good also for the three properties here.
> The delay values are only 4 bits wide, so you might also consider
> to switch to u8 or u16.
> 
I briefly looked over the rest of the driver. What is plain wrong
is to allocate memory for the private data structure in the
config_init callback. This has to be done in the probe callback.
An example is marvell_probe(). As you seem to work on this driver,
can you provide a patch for this?

> Please note that net-next is closed currently. Please resubmit the
> patches once it's open again, and please annotate them properly
> with net-next.
> 
>> Cc: Andrew Lunn <andrew@...n.ch>
>> Cc: Florian Fainelli <f.fainelli@...il.com>
>> Cc: Heiner Kallweit <hkallweit1@...il.com>
>> Signed-off-by: Trent Piepho <tpiepho@...inj.com>
>> ---
>>  drivers/net/phy/dp83867.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
>> index a46cc9427fb3..edd9e27425e8 100644
>> --- a/drivers/net/phy/dp83867.c
>> +++ b/drivers/net/phy/dp83867.c
>> @@ -82,9 +82,9 @@ enum {
>>  };
>>  
>>  struct dp83867_private {
>> -	int rx_id_delay;
>> -	int tx_id_delay;
>> -	int fifo_depth;
>> +	u32 rx_id_delay;
>> +	u32 tx_id_delay;
>> +	u32 fifo_depth;
>>  	int io_impedance;
>>  	int port_mirroring;
>>  	bool rxctrl_strap_quirk;
>>
>