linux-kernel - [PATCH 1/1] Char: ds1286, eliminate busy waiting

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Message-Id: <1217008198-17143-1-git-send-email-jirislaby@gmail.com>
Date:	Fri, 25 Jul 2008 19:49:58 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 1/1] Char: ds1286, eliminate busy waiting

ds1286_get_time(); is not called from atomic context, sleep for 20 ms is
better choice than a (home-made) busy waiting for such a situation.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
---
 drivers/char/ds1286.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
index fb58493..5329d48 100644
--- a/drivers/char/ds1286.c
+++ b/drivers/char/ds1286.c
@@ -443,7 +443,6 @@ static void ds1286_get_time(struct rtc_time *rtc_tm)
 {
 	unsigned char save_control;
 	unsigned long flags;
-	unsigned long uip_watchdog = jiffies;
 
 	/*
 	 * read RTC once any update in progress is done. The update
@@ -456,8 +455,7 @@ static void ds1286_get_time(struct rtc_time *rtc_tm)
 	 */
 
 	if (ds1286_is_updating() != 0)
-		while (time_before(jiffies, uip_watchdog + 2*HZ/100))
-			barrier();
+		msleep(20);
 
 	/*
 	 * Only the values that we read from the RTC are set. We leave
-- 
1.5.6.2

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