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

[Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>]

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;