netdev - Re: [PATCH] sky2: safer transmit ring cleaning

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: <20100112101306.6a67c0a5@nehalam>
Date:	Tue, 12 Jan 2010 10:13:06 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, mikem@...g3k.org,
	flyboy@...il.com, rjw@...k.pl, netdev@...r.kernel.org,
	mbreuer@...jas.com
Subject: Re: [PATCH] sky2: safer transmit ring cleaning

On Tue, 12 Jan 2010 19:04:30 +0100
Jarek Poplawski <jarkao2@...il.com> wrote:

> On Tue, Jan 12, 2010 at 08:15:13AM -0800, Stephen Hemminger wrote:
> > This code makes transmit path and transmit reset safer by:
> >   * adding memory barrier before checking available ring slots
> >   * reseting state of tx ring elements after free
> >   * seperate cleanup function from ring done function
> >   * removing mostly unused tx_next element  
> 
> Does this patch prevent re-enabling tx after netif_device_detach(),
> e.g. when sky2_detach() and sky2_tx_done() run at the same time on
> different cpus?
> 

Yes.
The napi is disabled during the detach so transmit completion can
not be done during that period.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html