From: David S. Miller <davem@davemloft.net>
Date: Sat, 25 Jun 2005 03:18:35 +0000 (-0700)
Subject: [TG3]: Eliminate all hw IRQ handler spinlocks.
X-Git-Tag: v2.6.13-rc1~68^2~244
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f47c11eeccc8820010992eb32dbe7370a08f8bd3;p=pandora-kernel.git

[TG3]: Eliminate all hw IRQ handler spinlocks.

Move all driver spinlocks to be taken at sw IRQ
context only.

This fixes the skb_copy() we were doing with hw
IRQs disabled (which is illegal and triggers a
BUG() with HIGHMEM enabled).  It also simplifies
the locking all over the driver tremendously.

We accomplish this feat by creating a special
sequence to synchronize with the hw IRQ handler
using a binary state and synchronize_irq().
This idea is from Herbert Xu.

Thanks to Michael Chan for helping to track down
all of the race conditions in initial versions
of this code.

Signed-off-by: David S. Miller <davem@davemloft.net>
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