linux-kernel - Re: [PATCH v3 2/5] pwm: dwc: drop redundant error check

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Date: Wed, 14 Feb 2024 18:48:00 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Raag Jadav <raag.jadav@...el.com>
Cc: jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com, 
	andriy.shevchenko@...ux.intel.com, lakshmi.sowjanya.d@...el.com, linux-pwm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] pwm: dwc: drop redundant error check

Hello,

On Mon, Feb 12, 2024 at 06:32:44PM +0530, Raag Jadav wrote:
> pcim_iomap_table() fails only if pcim_iomap_regions() fails. No need to
> check for failure if the latter is already successful.
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Raag Jadav <raag.jadav@...el.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/pwm/pwm-dwc.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
> index a4a057ae03ea..b9e18dbf7493 100644
> --- a/drivers/pwm/pwm-dwc.c
> +++ b/drivers/pwm/pwm-dwc.c
> @@ -50,10 +50,6 @@ static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
>  	}
>  
>  	dwc->base = pcim_iomap_table(pci)[0];
> -	if (!dwc->base) {
> -		dev_err(dev, "Base address missing\n");
> -		return -ENOMEM;
> -	}

As just written in reply to v2, I'd like to have a comment here saying
that pcim_iomap_table() won't fail after pcim_iomap_table() to prevent
someone sending a patch that undoes this change with the reasoning that
pcim_iomap_table()'s return value should be checked.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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