linux-kernel - Re: [PATCH v1 2/3] pwm: dwc: simplify error handling

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Date: Tue, 30 Jan 2024 10:31:02 +0200
From: Raag Jadav <raag.jadav@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: u.kleine-koenig@...gutronix.de, jarkko.nikula@...ux.intel.com,
	mika.westerberg@...ux.intel.com, lakshmi.sowjanya.d@...el.com,
	linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] pwm: dwc: simplify error handling

On Sun, Jan 28, 2024 at 04:48:16PM +0200, Andy Shevchenko wrote:
> On Mon, Jan 22, 2024 at 08:32:37AM +0530, Raag Jadav wrote:
> > Simplify error handling in ->probe() function using dev_err_probe() helper.
> 
> ...
> 
> >  	ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
> > -	if (ret) {
> > -		dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> > -		return ret;
> > -	}
> > +	if (ret)
> > +		return dev_err_probe(dev, ret, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> >  
> >  	base = pcim_iomap_table(pci)[0];
> 
> > -	if (!base) {
> > -		dev_err(dev, "Base address missing\n");
> > -		return -ENOMEM;
> > -	}
> > +	if (!base)
> > +		return dev_err_probe(dev, -ENOMEM, "Base address missing\n");
> 
> This check is bogus. Just remove it completely.
> 
> The pcim_iomap_table() fails IFF pcim_iomap_regions() fails.
> You have checked the latter already.

I'm no expert on devres but I found a few NULL returns in alloc_dr()
call path. In the interest of learning more about iomap, wouldn't we
need to handle them (just in some odd case)?

Raag