netdev - Re: [PATCH] Re: kernel BUG in eth_alloc_tx_desc_index at drivers/net/mv643xx

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Message-ID: <7d01f9f00701230442t7d39ba72we6ec3fc6bc0556e9@mail.gmail.com>
Date:	Tue, 23 Jan 2007 13:42:24 +0100
From:	"Thibaut VARENE" <T-Bone@...isc-linux.org>
To:	"Dale Farnsworth" <dale@...nsworth.org>
Cc:	"Jarek Poplawski" <jarkao2@...pl>, netdev@...r.kernel.org,
	mlachwani@...sta.com
Subject: Re: [PATCH] Re: kernel BUG in eth_alloc_tx_desc_index at drivers/net/mv643xx_eth.c:1069!

On 1/23/07, Thibaut VARENE <T-Bone@...isc-linux.org> wrote:
> - As Jarek pointed out, you're checking twice the value of
> mp->tx_desc_count, which means dereferencing a pointer and accessing
> memory twice. I don't know how perf-critical this bit of code is, but
> I wonder which of keeping the lock for a long time or doing what you
> is better (I'm being anal and you probably know that better than me :)

Forget that. That's an irq disabling lock, it's worse than anything else :)

-- 
Thibaut VARENE
http://www.parisc-linux.org/~varenet/
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