commit 63583c64558853f0fe7f8166907417792d184e18
author Bruno Prémont <bonbons@linux-vserver.org> Sun Aug 19 19:33:02 2012 +0200
committer Jiri Kosina <jkosina@suse.cz> Wed Sep 05 11:48:07 2012 +0200
tree f77dee08c6f833a64016ec993fe85222e0fd27ee
parent ae08e324146c89f1059e9d3c3898d0260a988795

HID: picoLCD: optimize for inactive debugfs

Matthieu CASTET adjusted picolcd_debug_out_report() to only operate when
there is an active listener on debugfs for events.

Do the same on the more important picolcd_debug_raw_event() that is
called in interrupt context as opposed to picolcd_debug_out_report()
which happens in whichever context that sends reports to device.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-picolcd_debugfs.c

diff --git a/drivers/hid/hid-picolcd_debugfs.c b/drivers/hid/hid-picolcd_debugfs.c
index 15c22f2..2c7308c 100644
--- a/drivers/hid/hid-picolcd_debugfs.c
+++ b/drivers/hid/hid-picolcd_debugfs.c
@@ -657,7 +657,7 @@
 
 #define BUFF_SZ 256
 	/* Avoid unnecessary overhead if debugfs is disabled */
-	if (!hdev->debug_events)
+	if (list_empty(&hdev->debug_list))
 		return;
 
 	buff = kmalloc(BUFF_SZ, GFP_ATOMIC);