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[PATCH 2/2][MIPS] add irq_disable_hazard() before c0_compare_int_pending

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 2/2][MIPS] add irq_disable_hazard() before c0_compare_int_pending()
From: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Date: Mon, 17 Mar 2008 23:49:42 +0900
Cc: yoichi_yuasa@tripeaks.co.jp, linux-mips <linux-mips@linux-mips.org>
In-reply-to: <20080317234740.705a8a34.yoichi_yuasa@tripeaks.co.jp>
Organization: TriPeaks Corporation
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20080317234740.705a8a34.yoichi_yuasa@tripeaks.co.jp>
Sender: linux-mips-bounce@linux-mips.org
Add irq_disable_hazard() before c0_compare_int_pending().

VR41xx sometime fails at this point.
It can be fix this patch.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>

diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/kernel/cevt-r4k.c 
linux/arch/mips/kernel/cevt-r4k.c
--- linux-orig/arch/mips/kernel/cevt-r4k.c      2008-03-12 16:37:31.317624763 
+0900
+++ linux/arch/mips/kernel/cevt-r4k.c   2008-03-12 16:37:39.894113510 +0900
@@ -205,6 +205,7 @@ static int c0_compare_int_usable(void)
        while ((int)(read_c0_count() - cnt) <= 0)
                ;       /* Wait for expiry  */
 
+       irq_disable_hazard();
        if (!c0_compare_int_pending())
                return 0;
 

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