linux-kernel - Re: [patch 4/5] net: hip04: Make tx coalesce timer actually work

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <552CC78D.3090906@huawei.com>
Date:	Tue, 14 Apr 2015 15:53:49 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Thomas Gleixner <tglx@...utronix.de>, Arnd Bergmann <arnd@...db.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	<netdev@...r.kernel.org>
Subject: Re: [patch 4/5] net: hip04: Make tx coalesce timer actually work

On 2015/4/14 6:08, Thomas Gleixner wrote:
> On Tue, 14 Apr 2015, Arnd Bergmann wrote:
>> On Monday 13 April 2015 23:42:03 Thomas Gleixner wrote:
>>>>
>>>> Question: this looks to me like it sets both the minimum and maximum
>>>> time to priv->tx_coalesce_usecs/2, when the intention was to set
>>>> the minimum to priv->tx_coalesce_usecs/2 and the maximum to
>>>> priv->tx_coalesce_usecs. Am I missing something subtle here, or did
>>>> you just misread my original intention from the botched code?
>>>
>>> Yes, I missed that. Simple fix for this is:
>>>
>>>   unsigned long t_ns = priv->tx_coalesce_usecs * NSEC_PER_USEC / 2;
>>>   
>>>   hrtimer_start_range_ns(&priv->tx_coalesce_timer, ns_to_ktime(t_ns),
>>>                          t_ns, HRTIMER_MODE_REL);
>>
>> Ah, good. I have to admit that I'd probably make the same mistake
>> again if I was to do this for another driver and you hadn't sent
>> the fix. The hrtimer_set_expires_range() function just looked like
>> it had been designed for the use case I was interested in ;-).
>>
>> Any idea how to prevent the next person from making the same mistake?
> 
> Yes. Documentation :)
> 
Looks good to me, thanks everyone.

Ding

> Thanks,
> 
> 	tglx
> 
> .
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/