linux-kernel - Re: [PATCH v2 1/2] Input: tegra-kbc- Convert to devm_ioremap

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Date:	Fri, 1 Feb 2013 12:24:13 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Input: tegra-kbc- Convert to
 devm_ioremap_resource()

On Fri, Feb 01, 2013 at 03:37:56PM +0530, Sachin Kamat wrote:
> Use the newly introduced devm_ioremap_resource() instead of
> devm_request_and_ioremap() which provides more consistent error handling.
> 
> devm_ioremap_resource() provides its own error messages; so all explicit
> error messages can be removed from the failure code paths.
> 
> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: linux-input@...r.kernel.org
> ---
>  Patch based & compile tested on linux-next tree (20130128).
>  Changes since v1:
>  * Dropped the error message as it is now handled by devm_ioremap_resource()
>  itself.
> ---
>  drivers/input/keyboard/tegra-kbc.c |    9 ++++-----
>  1 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
> index 46e8ad2..fc43806 100644
> --- a/drivers/input/keyboard/tegra-kbc.c
> +++ b/drivers/input/keyboard/tegra-kbc.c
> @@ -31,6 +31,7 @@
>  #include <linux/slab.h>
>  #include <linux/input/tegra_kbc.h>
>  #include <linux/clk/tegra.h>
> +#include <linux/err.h>
>  
>  #define KBC_MAX_DEBOUNCE_CNT	0x3ffu
>  
> @@ -615,11 +616,9 @@ static int tegra_kbc_probe(struct platform_device *pdev)
>  	spin_lock_init(&kbc->lock);
>  	setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
>  
> -	kbc->mmio = devm_request_and_ioremap(&pdev->dev, res);
> -	if (!kbc->mmio) {
> -		dev_err(&pdev->dev, "Cannot request memregion/iomap address\n");
> -		return -EBUSY;
> -	}
> +	kbc->mmio = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(kbc->mmio))
> +		return PTR_ERR(kbc->mmio);
>  
>  	kbc->clk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(kbc->clk)) {

Reviewed-by: Thierry Reding <thierry.reding@...onic-design.de>

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