linux-kernel - [PATCH v5 2/2] pwm: core: Set enable state properly on failed call to enable

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Message-ID: <1420659771-31401-3-git-send-email-jonathar@broadcom.com>
Date:	Wed, 7 Jan 2015 11:42:51 -0800
From:	Jonathan Richardson <jonathar@...adcom.com>
To:	Tim Kryger <tim.kryger@...il.com>
CC:	Scott Branden <sbranden@...adcom.com>,
	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
	"Jonathan Richardson" <jonathar@...adcom.com>
Subject: [PATCH v5 2/2] pwm: core: Set enable state properly on failed call to enable

The pwm_enable function didn't clear the enabled bit if a call to a
clients enable function returned an error. The result was that the state
of the pwm core was wrong. Clearing the bit when enable returns an error
ensures the state is properly set.

Tested-by: Jonathan Richardson <jonathar@...adcom.com>
Signed-off-by: Jonathan Richardson <jonathar@...adcom.com>
---
 drivers/pwm/core.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index f28c4ce..c33e24f 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -477,8 +477,14 @@ EXPORT_SYMBOL_GPL(pwm_set_polarity);
  */
 int pwm_enable(struct pwm_device *pwm)
 {
-	if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags))
-		return pwm->chip->ops->enable(pwm->chip, pwm);
+	int err;
+
+	if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags)) {
+		err = pwm->chip->ops->enable(pwm->chip, pwm);
+		if (err)
+			clear_bit(PWMF_ENABLED, &pwm->flags);
+		return err;
+	}
 
 	return pwm ? 0 : -EINVAL;
 }
-- 
1.7.9.5

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