linux-kernel - Re: [PATCH v3 2/3] Input: add new vibrator driver for various MSM SOCs

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Message-ID: <20190206005216.GA16650@basecamp>
Date:   Tue, 5 Feb 2019 19:52:16 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     andy.gross@...aro.org, david.brown@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, devicetree@...r.kernel.org,
        jonathan@...ek.ca
Subject: Re: [PATCH v3 2/3] Input: add new vibrator driver for various MSM
 SOCs

On Tue, Feb 05, 2019 at 11:42:46AM -0800, Dmitry Torokhov wrote:
> > +		dev_err(&pdev->dev, "Failed to lookup pwm clock: %ld\n",
> > +			PTR_ERR(vibrator->clk));
> > +		return PTR_ERR(vibrator->clk);
> > +	}
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	if (!res) {
> > +		dev_err(&pdev->dev, "Failed to get platform resource\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	vibrator->base = devm_ioremap(&pdev->dev, res->start,
> > +				     resource_size(res));
> > +	if (IS_ERR(vibrator->base)) {
> 
> devm_ioremap() returns NULL on error. You either need to check for NULL
> or see of you can use devm_ioremap_resource().

I originally tried to use devm_ioremap_resource() but the call to
devm_request_mem_region() would fail. I'll go with the NULL check here
for devm_ioremap().

Thanks for the review!

Brian