linux-kernel - Re: [PATCH 3/9] net: ethernet: ti: cpts: rework initialization/deinitialization

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Date:   Wed, 14 Sep 2016 23:37:45 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Mugunthan V N <mugunthanvnm@...com>,
        Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, WingMan Kwok <w-kwok2@...com>
Subject: Re: [PATCH 3/9] net: ethernet: ti: cpts: rework
 initialization/deinitialization

On 09/14/2016 11:32 PM, Richard Cochran wrote:
> On Wed, Sep 14, 2016 at 11:10:48PM +0300, Grygorii Strashko wrote:
>> On 09/14/2016 04:52 PM, Richard Cochran wrote:
>>> On Wed, Sep 14, 2016 at 04:02:25PM +0300, Grygorii Strashko wrote:
> 
>>>> -	if (!cpts->rx_enable)
>>>> +	if (!cpts || !cpts->rx_enable)
>>>>  		return;
> 
>> Ok. I can't say I'd like all this checks, but there are internal requirement 
>> to allow CPTS to be disabled though DT on KS2 (even if built in).
>> I'd try to clarify and return back here.
>>
>> But It'll be good to know your position - acceptable/can be discussed/completely unacceptable?
> 
> Look at that code snippet.  We already test for @cpts->rx_enable.  If
> you want to disable cpts at run time, just avoid setting that field.
> There is no need for any new tests or return codes.
> 

The problem is that if cpts not initialized than pinter on 
cpts (in consumer/parent driver - NETCP) will be NULL.
So, rx_enable will be unaccessible and cause crash :(

-- 
regards,
-grygorii