From: Bruno Prémont <bonbons@linux-vserver.org>
Date: Sun, 19 Aug 2012 17:33:02 +0000 (+0200)
Subject: HID: picoLCD: optimize for inactive debugfs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=63583c64558853f0fe7f8166907417792d184e18;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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>
---

diff --git a/drivers/hid/hid-picolcd_debugfs.c b/drivers/hid/hid-picolcd_debugfs.c
index 15c22f2ee748..2c7308c2ae1f 100644
--- a/drivers/hid/hid-picolcd_debugfs.c
+++ b/drivers/hid/hid-picolcd_debugfs.c
@@ -657,7 +657,7 @@ void picolcd_debug_raw_event(struct picolcd_data *data,
 
 #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);