linux-kernel - [PATCH] staging/rts_pstor: fix Polling thread wakeups CPU

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Date:	Tue,  3 May 2011 17:53:35 +0800
From:	"Cho, Yu-Chen" <acho@...ell.com>
To:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	gregkh@...e.de, wei_wang@...lsil.com.cn
Cc:	segoon@...nwall.com, a.beregalov@...il.com, jlee@...ell.com,
	acho@...ell.com
Subject: [PATCH] staging/rts_pstor: fix Polling thread wakeups CPU

RealTek PCI-E Card Reader rts_pstor driver causes CPU wakeup very
frequently, thatt's bad for power consumption.

Signed-off-by: Cho, Yu-Chen <acho@...ell.com>
---
 drivers/staging/rts_pstor/rtsx.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/rts_pstor/rtsx.c b/drivers/staging/rts_pstor/rtsx.c
index 02525d5..5ff59f2 100644
--- a/drivers/staging/rts_pstor/rtsx.c
+++ b/drivers/staging/rts_pstor/rtsx.c
@@ -594,7 +594,9 @@ static int rtsx_polling_thread(void *__dev)
 	wait_timeout((delay_use + 5) * 1000);
 
 	for (;;) {
-		wait_timeout(POLLING_INTERVAL);
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(POLLING_INTERVAL);
 
 		/* lock the device pointers */
 		mutex_lock(&(dev->dev_mutex));
-- 
1.7.1

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