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[PATCH 2/14] lemote: i8259 IMR write flush

To: linux-mips@linux-mips.org, Ralf Baechle <ralf@linux-mips.org>, 彭亮锦 <penglj@lemote.com>, "zhangfx@lemote.com" <zhangfx@lemote.com>
Subject: [PATCH 2/14] lemote: i8259 IMR write flush
From: yanhua <yanh@lemote.com>
Date: Thu, 09 Apr 2009 12:51:34 +0800
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Thunderbird 2.0.0.21 (Windows/20090302)
read back after write to IMR, otherwise, there will be many spurious
irqs from it.
---
arch/mips/kernel/i8259.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index 413bd1d..9d55c73 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -175,11 +175,13 @@ handle_real_irq:
if (irq & 8) {
inb(PIC_SLAVE_IMR); /* DUMMY - (do we need this?) */
outb(cached_slave_mask, PIC_SLAVE_IMR);
+ inb(PIC_SLAVE_IMR);
outb(0x60+(irq&7), PIC_SLAVE_CMD);/* 'Specific EOI' to slave */
outb(0x60+PIC_CASCADE_IR, PIC_MASTER_CMD); /* 'Specific EOI' to
master-IRQ2 */
} else {
inb(PIC_MASTER_IMR); /* DUMMY - (do we need this?) */
outb(cached_master_mask, PIC_MASTER_IMR);
+ inb(PIC_MASTER_IMR);
outb(0x60+irq, PIC_MASTER_CMD); /* 'Specific EOI to master */
}
smtc_im_ack_irq(irq);
-- 
1.5.6.5




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