linux-kernel - [PATCH] rtsx_usb_ms: Use msleep_interruptible() in polling loop

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Message-ID: <1415237557.3398.41.camel@decadent.org.uk>
Date:	Thu, 06 Nov 2014 01:32:37 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Roger Tseng <rogerable@...ltek.com>
Cc:	linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH] rtsx_usb_ms: Use msleep_interruptible() in polling loop

rtsx_usb_ms creates a task that mostly sleeps, but tasks in
uninterruptible sleep still contribute to the load average (for
bug-compatibility with Unix).  A load average of ~1 on a system that
should be idle is somewhat alarming.

Change the sleep to be interruptible, but still ignore signals.

A better fix might be to replace this loop with a delayed work item.

References: https://bugs.debian.org/765717
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
Re-sent without the typo in linux-kernel address.

Ben.

 drivers/memstick/host/rtsx_usb_ms.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index a7282b7..7356780 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -706,7 +706,8 @@ poll_again:
 		if (host->eject)
 			break;
 
-		msleep(1000);
+		if (msleep_interruptible(1000))
+			flush_signals(current);
 	}
 
 	complete(&host->detect_ms_exit);


-- 
Ben Hutchings
Beware of programmers who carry screwdrivers. - Leonard Brandwein

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