linux-kernel - Re: [PATCH 2/4] gpio: davinci: Handle the return value of davinci_gpio_irq

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Date:   Thu, 20 Jul 2017 11:50:47 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Keerthy <j-keerthy@...com>
Cc:     Johan Hovold <johan@...nel.org>, linus.walleij@...aro.org,
        ssantosh@...nel.org, devicetree@...r.kernel.org, nsekhar@...com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        robh+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
        fcooper@...com
Subject: Re: [PATCH 2/4] gpio: davinci: Handle the return value of
 davinci_gpio_irq_setup function

On Thu, Jul 20, 2017 at 02:40:37PM +0530, Keerthy wrote:
> 
> 
> On Thursday 20 July 2017 12:14 PM, Keerthy wrote:
> > 
> > 
> > On Wednesday 19 July 2017 04:40 PM, Johan Hovold wrote:
> >> On Tue, Jul 18, 2017 at 04:27:14PM +0530, Keerthy wrote:
> >>> Currently davinci_gpio_irq_setup return value is ignored. Handle the
> >>> return value appropriately.
> >>>
> >>> Signed-off-by: Keerthy <j-keerthy@...com>
> >>> ---
> >>>  drivers/gpio/gpio-davinci.c | 18 +++++++++++++-----
> >>>  1 file changed, 13 insertions(+), 5 deletions(-)
> >>>
> >>> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
> >>> index 2c88054..932f270 100644
> >>> --- a/drivers/gpio/gpio-davinci.c
> >>> +++ b/drivers/gpio/gpio-davinci.c
> >>> @@ -233,15 +233,23 @@ static int davinci_gpio_probe(struct platform_device *pdev)
> >>>  		chips->regs[bank] = gpio_base + offset_array[bank];
> >>>  
> >>>  	ret = devm_gpiochip_add_data(dev, &chips->chip, chips);
> >>> +	if (ret)
> >>> +		goto err;
> >>> +
> >>> +	platform_set_drvdata(pdev, chips);
> >>> +	ret = davinci_gpio_irq_setup(pdev);
> >>>  	if (ret) {
> >>> -		ctrl_num = 0;
> >>> -		bank_base = 0;
> >>> -		return ret;
> >>> +		platform_set_drvdata(pdev, NULL);
> >>> +		goto err;
> >>>  	}
> >>>  
> >>> -	platform_set_drvdata(pdev, chips);
> >>> -	davinci_gpio_irq_setup(pdev);
> >>>  	return 0;
> >>
> >> There's a separate but related bug here too as the clk_prepare_enable()
> >> in davinci_gpio_irq_setup() is never balanced on driver unbind.
> > 
> > Yes Johan. I will send that as a separate patch.
> 
> This is already fixed in the latest kernel:
> 
> commit 6dc0048cff988858254fcc26becfc1e9753efa79
> Author: Arvind Yadav <arvind.yadav.cs@...il.com>
> Date:   Tue May 23 14:48:57 2017 +0530

That change only handles errors in davinci_gpio_irq_setup() (i.e. during
probe) and not the imbalance at driver unbind that I was referring to.

Johan