From: Michael Chan <mchan@broadcom.com>
Date: Mon, 7 May 2007 07:26:15 +0000 (-0700)
Subject: [TG3]: Eliminate spurious interrupts.
X-Git-Tag: v2.6.22-rc1~822^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c04cb34725fdcf5fdb4135d8fdfaf6f318f10e99;p=pandora-kernel.git

[TG3]: Eliminate spurious interrupts.

Spurious interrupts are often encountered especially on systems
using the 8259 PIC mode.  This is because the I/O write to deassert
the interrupt is posted and won't get to the chip immediately.  As
a result, the IRQ may remain asserted after the IRQ handler exits,
causing spurious interrupts.

Flush the interrupt mailbox in non-MSI handlers to de-assert the
IRQ immediately.  This seems to be the most straight forward approach
after discussion with Jeff Garzik and David Miller.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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