linux-kernel - Re: [patch v2] net: hip04: Make tx coalesce timer actually work

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Message-ID: <2657074.k4FFdZD9ci@wuerfel>
Date:	Wed, 15 Apr 2015 12:20:01 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	peterz@...radead.org, mingo@...nel.org, dingtianhong@...wei.com,
	zhangfei.gao@...aro.org, dan.carpenter@...cle.com,
	netdev@...r.kernel.org
Subject: Re: [patch v2] net: hip04: Make tx coalesce timer actually work

On Tuesday 14 April 2015 21:42:42 Thomas Gleixner wrote:
> The code sets the expiry value of the timer to a relative value and
> starts it with hrtimer_start_expires. That's fine, but that only works
> once. The timer is started in relative mode, so the expiry value gets
> overwritten with the absolut expiry time (now + expiry).
> 
> So once the timer expired, a new call to hrtimer_start_expires results
> in an immidiately expired timer, because the expiry value is
> already in the past.
> 
> Use the proper mechanisms to (re)start the timer in the intended way.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: dingtianhong <dingtianhong@...wei.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Zhangfei Gao <zhangfei.gao@...aro.org>
> Cc: Dan Carpenter <dan.carpenter@...cle.com>
> Cc: netdev@...r.kernel.org
> 

Acked-by: Arnd Bergmann <arnd@...db.de>
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