tree 2d18138f5c9697f71861c37f94aa2e7cbfc5228b
parent 9b1084b8f99a6b5e97c0c9bc1b4455db4fa51a07
author Michael Chan <mchan@broadcom.com> 1183873863 -0700
committer David S. Miller <davem@sunset.davemloft.net> 1184131115 -0700

[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>