From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Thu, 30 Sep 2010 01:04:21 +0000 (-0700)
Subject: Input: sysrq - add locking to sysrq_filter()
X-Git-Tag: v2.6.37-rc1~5^2~3^2~27
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1966cb225c6f9040ca163802cbd052c393d4448f;p=platform%2Fkernel%2Flinux-3.10.git

Input: sysrq - add locking to sysrq_filter()

Similarly to the keyboard handler, we are called by different input
devices and thus need to add spinlock if we want to maintain our
state properly.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index ef31bb8..f0ad694 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -566,10 +566,16 @@ static const unsigned char sysrq_xlate[KEY_MAX + 1] =
 static bool sysrq_down;
 static int sysrq_alt_use;
 static int sysrq_alt;
+static DEFINE_SPINLOCK(sysrq_event_lock);
 
 static bool sysrq_filter(struct input_handle *handle, unsigned int type,
 		         unsigned int code, int value)
 {
+	bool suppress;
+
+	/* We are called with interrupts disabled, just take the lock */
+	spin_lock(&sysrq_event_lock);
+
 	if (type != EV_KEY)
 		goto out;
 
@@ -601,7 +607,10 @@ static bool sysrq_filter(struct input_handle *handle, unsigned int type,
 	}
 
 out:
-	return sysrq_down;
+	suppress = sysrq_down;
+	spin_unlock(&sysrq_event_lock);
+
+	return suppress;
 }
 
 static int sysrq_connect(struct input_handler *handler,
@@ -652,8 +661,8 @@ static void sysrq_disconnect(struct input_handle *handle)
 }
 
 /*
- * We are matching on KEY_LEFTALT insteard of KEY_SYSRQ because not all
- * keyboards have SysRq ikey predefined and so user may add it to keymap
+ * We are matching on KEY_LEFTALT instead of KEY_SYSRQ because not all
+ * keyboards have SysRq key predefined and so user may add it to keymap
  * later, but we expect all such keyboards to have left alt.
  */
 static const struct input_device_id sysrq_ids[] = {