From: Ben Nizette <bn@niasdigital.com>
Date: Sat, 18 Apr 2009 03:35:58 +0000 (-0700)
Subject: Input: ucb1400 - use disable_irq_nosync() in irq handler
X-Git-Tag: firefly_0821_release~14071^2~22
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3deb649e654ff87b87de9e415ac43ca8afbdff07;p=firefly-linux-kernel-4.4.55.git

Input: ucb1400 - use disable_irq_nosync() in irq handler

disable_irq() waits for all running handlers to complete before
returning.  As such, if it's used to disable an interrupt from
that interrupt's handler it will deadlock.  This replaces the
dangerous instances with the _nosync() variant which doesn't have
this problem.

Signed-off-by: Ben Nizette <bn@niasdigital.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index e868264fe799..f100c7f4c1db 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -256,7 +256,7 @@ static irqreturn_t ucb1400_hard_irq(int irqnr, void *devid)
 	struct ucb1400_ts *ucb = devid;
 
 	if (irqnr == ucb->irq) {
-		disable_irq(ucb->irq);
+		disable_irq_nosync(ucb->irq);
 		ucb->irq_pending = 1;
 		wake_up(&ucb->ts_wait);
 		return IRQ_HANDLED;