linux-kernel - [PATCH v2] gpio: cs5535: Switch to using managed resources with devm

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Date:	Tue,  7 Oct 2014 12:35:16 +0530
From:	Pramod Gurav <pramod.gurav@...rtplayin.com>
To:	linux-kernel@...r.kernel.org
Cc:	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-gpio@...r.kernel.org
Subject: [PATCH v2] gpio: cs5535: Switch to using managed resources with devm_

This change switches to devm_request_region to request region
and hence simplifies the module unload and does away with
release_region in remove function.

Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Alexandre Courbot <gnurou@...il.com>
Cc: linux-gpio@...r.kernel.org
Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
---

Changes since v1:

Change commit subject to reflect cs5535.

 drivers/gpio/gpio-cs5535.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-cs5535.c b/drivers/gpio/gpio-cs5535.c
index 668127f..71484ee 100644
--- a/drivers/gpio/gpio-cs5535.c
+++ b/drivers/gpio/gpio-cs5535.c
@@ -322,7 +322,8 @@ static int cs5535_gpio_probe(struct platform_device *pdev)
 		goto done;
 	}
 
-	if (!request_region(res->start, resource_size(res), pdev->name)) {
+	if (!devm_request_region(&pdev->dev, res->start, resource_size(res),
+				 pdev->name)) {
 		dev_err(&pdev->dev, "can't request region\n");
 		goto done;
 	}
@@ -348,24 +349,18 @@ static int cs5535_gpio_probe(struct platform_device *pdev)
 	/* finally, register with the generic GPIO API */
 	err = gpiochip_add(&cs5535_gpio_chip.chip);
 	if (err)
-		goto release_region;
+		goto done;
 
 	return 0;
 
-release_region:
-	release_region(res->start, resource_size(res));
 done:
 	return err;
 }
 
 static int cs5535_gpio_remove(struct platform_device *pdev)
 {
-	struct resource *r;
-
 	gpiochip_remove(&cs5535_gpio_chip.chip);
 
-	r = platform_get_resource(pdev, IORESOURCE_IO, 0);
-	release_region(r->start, resource_size(r));
 	return 0;
 }
 
-- 
1.7.9.5

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