From: Michael Chan <mchan@broadcom.com>
Date: Sun, 8 Jul 2007 05:51:03 +0000 (-0700)
Subject: [BNX2]: Reduce spurious INTA interrupts.
X-Git-Tag: v2.6.23-rc1~1109^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8a7ce7bedb2134acb731e08e588ad92087a40ff;p=pandora-kernel.git

[BNX2]: Reduce spurious INTA 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.

Add read back to flush the I/O write to deassert the IRQ immediately.
We also store the last_status_idx immediately in the IRQ handler to
help detect whether the interrupt is ours or not when the IRQ is
entered again before ->poll gets called.

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