HID: hid-core: optimize in case of hidraw

When using hidraw, hid buffer can be big and take lot's of
time to process (interrupt) kernel context.
Don't try to parse report if we are only interrested in hidraw.

Also don't prepare data for debug stuff if no debugfs file
are opened.

Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 9 insertions, 3 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 4c87276c8ddb..71f87b1d71de 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1194,8 +1194,10 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
                         goto out;
         }
 
-        for (a = 0; a < report->maxfield; a++)
-                hid_input_field(hid, report->field[a], cdata, interrupt);
+        if (hid->claimed != HID_CLAIMED_HIDRAW) {
+                for (a = 0; a < report->maxfield; a++)
+                        hid_input_field(hid, report->field[a], cdata, interrupt);
+        }
 
         if (hid->claimed & HID_CLAIMED_INPUT)
                 hidinput_report_event(hid, report);
@@ -1243,6 +1245,10 @@ int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int i
                 goto unlock;
         }
 
+        /* Avoid unnecessary overhead if debugfs is disabled */
+        if (list_empty(&hid->debug_list))
+                goto nomem;
+
         buf = kmalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_ATOMIC);
 
         if (!buf)
diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index 45c3433f7986..3e0a1e5d2ad5 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -1846,7 +1846,7 @@ static void picolcd_debug_out_report(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);