linux-kernel - Re: [PATCH] net/cadence/macb: clear interrupts simply and correctly

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]

Date:	Tue, 17 Jun 2014 11:38:44 +0900
From:	Jongsung Kim <neidhard.kim@....com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Hayun Hwang <hwang.hayun@....com>,
	Youngkyu Choi <youngkyu7.choi@....com>
Subject: Re: [PATCH] net/cadence/macb: clear interrupts simply and correctly

On 06/16/2014 11:56 PM, Sören Brinkmann wrote:
> On Mon, 2014-06-16 at 02:00PM +0900, Jongsung Kim wrote:
>> On 06/13/2014 12:44 AM, Sören Brinkmann wrote:
>>> This is now clearing all IRQ flags which is probably not what we want
>>> here. This is handling RX only. We still want the non-RX interrupts to go to
>>> the actual interrupt service routing.
>>
>> The ISR(Interrupt Status Register) is read only in the interrupt service
>> routine, macb_interrupt. But is partially cleared here and there. Further
>> handler-functions decide jobs to be done by reading/checking other status
>> registers. (e.g., TSR, RSR) So, clearing the ISR after reading looks not
>> a bad idea.
>
> But you are clearing _all_ interrupt flags in the RX NAPI handler.
> Doesn't that mean we might miss certain events?

Please inspect my patch again. What I did in the macb_poll is removing
statements clearing the Rx-complete interrupt, not clearing all the
interrupts.
--
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/