[media] rc/imon: fix ffdc device detection oops

There's a nasty bug that slipped in when the rc device interface was
altered, only affecting the older 0xffdc imon devices. We were trying
to access ictx->rdev->allowed_protos before ictx->rdev had been set.

There's also an issue with call ordering that meant the correct
keymap wasn't getting loaded for MCE IR type 0xffdc devices.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index 6811512b4e83..a30bd99c5ca4 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -1756,7 +1756,6 @@ static void imon_get_ffdc_type(struct imon_context *ictx)
         printk(KERN_CONT " (id 0x%02x)\n", ffdc_cfg_byte);
 
         ictx->display_type = detected_display_type;
-        ictx->rdev->allowed_protos = allowed_protos;
         ictx->rc_type = allowed_protos;
 }
 
@@ -1839,10 +1838,6 @@ static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
         rdev->allowed_protos = RC_TYPE_OTHER | RC_TYPE_RC6; /* iMON PAD or MCE */
         rdev->change_protocol = imon_ir_change_protocol;
         rdev->driver_name = MOD_NAME;
-        if (ictx->rc_type == RC_TYPE_RC6)
-                rdev->map_name = RC_MAP_IMON_MCE;
-        else
-                rdev->map_name = RC_MAP_IMON_PAD;
 
         /* Enable front-panel buttons and/or knobs */
         memcpy(ictx->usb_tx_buf, &fp_packet, sizeof(fp_packet));
@@ -1851,11 +1846,18 @@ static struct rc_dev *imon_init_rdev(struct imon_context *ictx)
         if (ret)
                 dev_info(ictx->dev, "panel buttons/knobs setup failed\n");
 
-        if (ictx->product == 0xffdc)
+        if (ictx->product == 0xffdc) {
                 imon_get_ffdc_type(ictx);
+                rdev->allowed_protos = ictx->rc_type;
+        }
 
         imon_set_display_type(ictx);
 
+        if (ictx->rc_type == RC_TYPE_RC6)
+                rdev->map_name = RC_MAP_IMON_MCE;
+        else
+                rdev->map_name = RC_MAP_IMON_PAD;
+
         ret = rc_register_device(rdev);
         if (ret < 0) {
                 dev_err(ictx->dev, "remote input dev register failed\n");