linux-kernel - [PATCH] Pinctrl: SPEAr: Plgpio: Don't call prepare/unprepare on request/free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 14 Nov 2012 14:44:07 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	linus.walleij@...aro.org
Cc:	axel.lin@...ics.com, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH] Pinctrl: SPEAr: Plgpio: Don't call prepare/unprepare on request/free

SPEAr SoC's don't do anything in clk_prepare() of plgpio driver, so there is no
need to call this routine multiple times. Just call it once at probe.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
Hi Linus,

This patch is rebased over https://lkml.org/lkml/2012/11/14/220

 drivers/pinctrl/spear/pinctrl-plgpio.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/spear/pinctrl-plgpio.c b/drivers/pinctrl/spear/pinctrl-plgpio.c
index cf6d9c2..5aebbf7 100644
--- a/drivers/pinctrl/spear/pinctrl-plgpio.c
+++ b/drivers/pinctrl/spear/pinctrl-plgpio.c
@@ -213,7 +213,7 @@ static int plgpio_request(struct gpio_chip *chip, unsigned offset)
 		return ret;
 
 	if (!IS_ERR(plgpio->clk)) {
-		ret = clk_prepare_enable(plgpio->clk);
+		ret = clk_enable(plgpio->clk);
 		if (ret)
 			goto err0;
 	}
@@ -244,7 +244,7 @@ static int plgpio_request(struct gpio_chip *chip, unsigned offset)
 
 err1:
 	if (!IS_ERR(plgpio->clk))
-		clk_disable_unprepare(plgpio->clk);
+		clk_disable(plgpio->clk);
 err0:
 	pinctrl_free_gpio(gpio);
 	return ret;
@@ -275,7 +275,7 @@ static void plgpio_free(struct gpio_chip *chip, unsigned offset)
 
 disable_clk:
 	if (!IS_ERR(plgpio->clk))
-		clk_disable_unprepare(plgpio->clk);
+		clk_disable(plgpio->clk);
 
 	pinctrl_free_gpio(gpio);
 }
@@ -584,10 +584,18 @@ static int __devinit plgpio_probe(struct platform_device *pdev)
 	plgpio->chip.dev = &pdev->dev;
 	plgpio->chip.owner = THIS_MODULE;
 
+	if (!IS_ERR(plgpio->clk)) {
+		ret = clk_prepare(plgpio->clk);
+		if (ret) {
+			dev_err(&pdev->dev, "clk prepare failed\n");
+			return ret;
+		}
+	}
+
 	ret = gpiochip_add(&plgpio->chip);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to add gpio chip\n");
-		return ret;
+		goto unprepare_clk;
 	}
 
 	irq = platform_get_irq(pdev, 0);
@@ -629,6 +637,9 @@ remove_gpiochip:
 	dev_info(&pdev->dev, "Remove gpiochip\n");
 	if (gpiochip_remove(&plgpio->chip))
 		dev_err(&pdev->dev, "unable to remove gpiochip\n");
+unprepare_clk:
+	if (!IS_ERR(plgpio->clk))
+		clk_unprepare(plgpio->clk);
 
 	return ret;
 }
-- 
1.7.12.rc2.18.g61b472e

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/