linux-kernel - [PATCH] RTC: Return -EBUSY, not -EACCES when device is busy

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Date:	Thu, 6 Jun 2013 10:46:09 -0700
From:	cbrand@...adcom.com
To:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
cc:	"Chris Brand" <chris.brand@...adcom.com>
Subject: [PATCH] RTC: Return -EBUSY, not -EACCES when device is busy

From: Chris Brand <chris.brand@...adcom.com>

If rtc->irq_task is non-NULL and task is NULL, they always
differ, which means that in rtc_irq_set_state() and
rtc_irq_set_freq(), whenever err is set to -EBUSY it will
then immediately be set to -EACCES, misleading the caller
as to the underlying problem.
---
 drivers/rtc/interface.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 42bd57d..40d4032 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -698,9 +698,9 @@ retry:
 	spin_lock_irqsave(&rtc->irq_task_lock, flags);
 	if (rtc->irq_task != NULL && task == NULL)
 		err = -EBUSY;
-	if (rtc->irq_task != task)
+	else if (rtc->irq_task != task)
 		err = -EACCES;
-	if (!err) {
+	else {
 		if (rtc_update_hrtimer(rtc, enabled) < 0) {
 			spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
 			cpu_relax();
@@ -734,9 +734,9 @@ retry:
 	spin_lock_irqsave(&rtc->irq_task_lock, flags);
 	if (rtc->irq_task != NULL && task == NULL)
 		err = -EBUSY;
-	if (rtc->irq_task != task)
+	else if (rtc->irq_task != task)
 		err = -EACCES;
-	if (!err) {
+	else {
 		rtc->irq_freq = freq;
 		if (rtc->pie_enabled && rtc_update_hrtimer(rtc, 1) < 0) {
 			spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
-- 
1.7.5.4


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