From: Mike Frysinger <vapier@gentoo.org>
Date: Wed, 10 Mar 2010 04:38:45 +0000 (-0800)
Subject: Input: bf54x-keys - fix system hang when pressing a key
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=9e49f6c1339a7972e23a335c4c71a289b4c6f65b;p=openwrt%2Fstaging%2Fblogic.git

Input: bf54x-keys - fix system hang when pressing a key

We need to use the nosync version of disable_irq so that we don't hang in
the IRQ handler as we don't ACK the interrupt until later.  This used to
work regardless, but at some point, the IRQ behavior changed.  Not sure
when exactly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/keyboard/bf54x-keys.c b/drivers/input/keyboard/bf54x-keys.c
index fe376a27fe57..593c052416b9 100644
--- a/drivers/input/keyboard/bf54x-keys.c
+++ b/drivers/input/keyboard/bf54x-keys.c
@@ -162,7 +162,7 @@ static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
 	input_sync(input);
 
 	if (bfin_kpad_get_keypressed(bf54x_kpad)) {
-		disable_irq(bf54x_kpad->irq);
+		disable_irq_nosync(bf54x_kpad->irq);
 		bf54x_kpad->lastkey = key;
 		mod_timer(&bf54x_kpad->timer,
 			  jiffies + bf54x_kpad->keyup_test_jiffies);