linux-kernel - RE: mwifiex: propagate error if IRQ request fails in mwifiex_sdio

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Message-ID: <0f15fe320fa34ae287f8a6b91ec78a34@SC-EXCH04.marvell.com>
Date:   Thu, 8 Sep 2016 15:55:34 +0000
From:   Amitkumar Karwar <akarwar@...vell.com>
To:     Javier Martinez Canillas <javier@....samsung.com>,
        Kalle Valo <kvalo@...eaurora.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "Nishant Sarmukadam" <nishants@...vell.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>
Subject: RE: mwifiex: propagate error if IRQ request fails in
 mwifiex_sdio_of()

Hi Javier,

> From: Javier Martinez Canillas [mailto:javier@....samsung.com]
> Sent: Tuesday, September 06, 2016 5:43 PM
> To: Kalle Valo
> Cc: linux-kernel@...r.kernel.org; Amitkumar Karwar;
> netdev@...r.kernel.org; linux-wireless@...r.kernel.org; Nishant
> Sarmukadam; Arend van Spriel
> Subject: Re: mwifiex: propagate error if IRQ request fails in
> mwifiex_sdio_of()
> 
> Hello Kalle,
> 
> On 09/03/2016 12:35 PM, Kalle Valo wrote:
> > Javier Martinez Canillas <javier@....samsung.com> 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.
> >>
> >> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> >
> > What's the conclusion with this patch? Should I drop it or take it?
> >
> > (The discussion is available from the patchwork link in the
> > signature.)
> >
> 
> My understanding is that Arend agrees with the patch and that the
> question raised was caused by looking at an older kernel version. IOW,
> the patch is OK and should be picked.
> 
> I'm adding Arend to cc, so can comment in case I misunderstood him
> though.
> 

This error doesn't affect actual wifi functionality. Only thing is wakeup on interrupt when system is in suspended state won't work.
I think, we can make below change. 

------------------
@@ -122,9 +122,11 @@ static int mwifiex_sdio_probe_of(struct device *dev, struct sdio_mmc_card *card)
                                               IRQF_TRIGGER_LOW,
                                               "wifi_wake", cfg);
           if (ret) {
-                    dev_err(dev,
+                    dev_dbg(dev,
                             "Failed to request irq_wifi %d (%d)\n",
                             cfg->irq_wifi, ret);
+                    card->plt_wake_cfg = NULL;
+                    return 0;
             }
                disable_irq(cfg->irq_wifi);
            }
-----------------

Regards,
Amitkumar