netdev - Re: [PATCH] mwifiex: propagate error if IRQ request fails in mwifiex_sdio

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Date:   Thu, 18 Aug 2016 15:29:01 -0400
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        linux-kernel@...r.kernel.org
Cc:     Amitkumar Karwar <akarwar@...vell.com>,
        Kalle Valo <kvalo@...eaurora.org>, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Nishant Sarmukadam <nishants@...vell.com>
Subject: Re: [PATCH] mwifiex: propagate error if IRQ request fails in
 mwifiex_sdio_of()

Hello Arend,

Thanks a lot for your feedback.

On 08/18/2016 03:14 PM, Arend van Spriel wrote:
> On 18-08-16 16:17, Javier Martinez Canillas wrote:
>> If request_irq() fails in mwifiex_sdio_probe_of(), only an error message
>> is printed but the actual error is not propagated to the caller function.
> 
> Hmm. The caller function, ie. mwifiex_sdio_probe(), does not seem to care.
>

Hmm, I'm not so sure about that. It's checking the wifiex_sdio_probe_of()
return value.

If the IRQ request failing is not an error, then at the very least the call
to disable_irq() should be avoided if request_irq() fails, and the message
should be changed from dev_err() to dev_dgb() or dev_info().

> The device may still function without this wake interrupt.
>

That's correct, the binding says that the "interrupts" property in the child
node is optional since is just a wakeup IRQ. Now the question is if should
be an error if the IRQ is defined but fails to be requested.

> Regards,
> Arend
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America