linux-kernel - Re: [PATCH] net: ethernet: ti: cpsw: Push the request

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Date:   Fri, 21 Jul 2017 10:55:00 -0500
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Keerthy <j-keerthy@...com>, David Miller <davem@...emloft.net>
CC:     <linux-omap@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <johan@...nel.org>,
        <ivan.khoronzhuk@...aro.org>, <t-kristo@...com>, <nsekhar@...com>
Subject: Re: [PATCH] net: ethernet: ti: cpsw: Push the request_irq function to
 the end of probe



On 07/20/2017 11:45 PM, Keerthy wrote:
> 
> 
> On Friday 21 July 2017 04:14 AM, Grygorii Strashko wrote:
>>
>>
>> On 07/20/2017 05:28 PM, David Miller wrote:
>>> From: Grygorii Strashko <grygorii.strashko@...com>
>>> Date: Thu, 20 Jul 2017 11:08:09 -0500
>>>
>>>> In general patch looks good to me, but it's really unexpected to
>>>> receive IRQs while CPSW is probing ;(
>>>
>>> This is a poor expectation.
>>>
>>> Boot loaders and other entities can leave the device in any state
>>> whatsoever.
>>>
>>> Furthermore, enabling an IRQ whose handler cannot properly execute
>>> without crashing is wrong fundamentally.  All data structures and
>>> state must be set up properly before the IRQ is requested.
>>>
>>> Therefore this patch is correct and I will apply it.
>>>
>>
>> Thanks. Agree (it just has never triggered before, so I meant - unexpected
>>   from current driver code point of view ;().
>> And I'm just worry that it might not be enough :(, especially for am335x.
> 
> I tried nfs boot on am335x-evm with this patch and it boots fine for me.
> 

Thank you Keerthy, I've also simulated and tested it on am335x and dra7
and see networking working and no crashes.

-- 
regards,
-grygorii