linux-kernel - Re: [PATCH RESEND] rtsx_usb_ms: Use msleep

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Date:	Thu, 8 Oct 2015 03:37:22 +0000
From:	Roger Tseng <rogerable@...ltek.com>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	Maxim Levitsky <maximlevitsky@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in polling loop

On Mon, 2015-09-28 at 01:34 +0100, Ben Hutchings wrote:
> 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.
The change should be OK providing it does the same delay. You can add my
ack.

> References: https://bugs.debian.org/765717
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
> --- 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);

-- 
Best regards,
Roger Tseng