netdev - Re: [PATCH RFC]: napi

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:	Wed, 25 Jul 2007 17:37:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	netdev@...r.kernel.org, jgarzik@...ox.com, hadi@...erus.ca,
	rusty@...tcorp.com.au
Subject: Re: [PATCH RFC]: napi_struct V4

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Wed, 25 Jul 2007 09:56:54 +0100

> The usage of NAPI on 8139cp and 8139too seems dodgy;
> these drivers expect this to work:
> 
> 		local_irq_save(flags);
> 		cpw16_f(IntrMask, cp_intr_mask);
> 		__netif_rx_complete(dev);
> 		local_irq_restore(flags);
> 
> It works on SMP only because if poll races with IRQ, 
> the IRQ is not masked or cleared so the IRQ will get restarted.
> 
> Better would be to change it to:
> 		spin_lock_irqsave(&cp->lock, flags);
> 		cpw16_f(IntrMask, cp_intr_mask);
> 		__netif_rx_complete(dev);
> 		spin_unlock_irqrestore(&cp->lock, flags);
> 
> Which actually is same code on UP.

I've made these fixes to my tree, thanks Stephen.
-
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