From ac495bf8971f2dc9d401d892849977e86633ced6 Mon Sep 17 00:00:00 2001
From: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Date: Tue, 17 Jul 2007 04:05:00 -0700
Subject: [PATCH] rtc-dev: return -ENOTTY in ioctl if irq_set_freq is not
 implemented by driver

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/rtc/rtc-dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index f4e5f0040ff7..304535942de2 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -341,6 +341,8 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
 	case RTC_IRQP_READ:
 		if (ops->irq_set_freq)
 			err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
+		else
+			err = -ENOTTY;
 		break;
 
 	case RTC_IRQP_SET:
-- 
2.20.1