From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Date: Fri, 10 Mar 2006 01:33:37 +0000 (-0800)
Subject: [PATCH] alpha: fix IRQ handling lockup
X-Git-Tag: v2.6.16-rc6~42
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eff2c2f6f569267aa52e2431844cec30637d7ade;p=linux-2.6

[PATCH] alpha: fix IRQ handling lockup

Fix a lockup which was introduced during the conversion to the generic IRQ
framework.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c
index 9006063e73..da677f829f 100644
--- a/arch/alpha/kernel/irq.c
+++ b/arch/alpha/kernel/irq.c
@@ -151,8 +151,13 @@ handle_irq(int irq, struct pt_regs * regs)
 	}
 
 	irq_enter();
+	/*
+	 * __do_IRQ() must be called with IPL_MAX. Note that we do not
+	 * explicitly enable interrupts afterwards - some MILO PALcode
+	 * (namely LX164 one) seems to have severe problems with RTI
+	 * at IPL 0.
+	 */
 	local_irq_disable();
 	__do_IRQ(irq, regs);
-	local_irq_enable();
 	irq_exit();
 }