Input: rc-keymap - return KEY_RESERVED for unknown mappings

Do not respond with -EINVAL to EVIOCGKEYCODE for not-yet-mapped
scancodes, but rather return KEY_RESERVED.

This fixes breakage with Ubuntu's input-kbd utility that stopped
returning full keymaps for remote controls.

Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Mark Lord <kernel@teksavvy.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 72be8a0..512a2f4 100644 (file)
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -458,21 +458,27 @@ static int ir_getkeycode(struct input_dev *idev,
                index = ir_lookup_by_scancode(rc_map, scancode);
        }
 
-       if (index >= rc_map->len) {
-               if (!(ke->flags & INPUT_KEYMAP_BY_INDEX))
-                       IR_dprintk(1, "unknown key for scancode 0x%04x\n",
-                                  scancode);
+       if (index < rc_map->len) {
+               entry = &rc_map->scan[index];
+
+               ke->index = index;
+               ke->keycode = entry->keycode;
+               ke->len = sizeof(entry->scancode);
+               memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
+
+       } else if (!(ke->flags & INPUT_KEYMAP_BY_INDEX)) {
+               /*
+                * We do not really know the valid range of scancodes
+                * so let's respond with KEY_RESERVED to anything we
+                * do not have mapping for [yet].
+                */
+               ke->index = index;
+               ke->keycode = KEY_RESERVED;
+       } else {
                retval = -EINVAL;
                goto out;
        }
 
-       entry = &rc_map->scan[index];
-
-       ke->index = index;
-       ke->keycode = entry->keycode;
-       ke->len = sizeof(entry->scancode);
-       memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
-
        retval = 0;
 
 out: