Currently in slim_rx_mux_put, an RX channel gets added to a new list even if it is already in one. This can mess up links and make either it, the new list head, or both, get linked to the wrong entries. This can cause an entry to link to itself which in turn ends up making list_for_each_entry in other functions loop infinitely. To avoid issues, always remove the RX channel from any list it's in before adding it to a new list.
Unified · Split
| @@ -1289,9 +1289,12 @@ static int slim_rx_mux_put(struct snd_kcontrol *kc, · 1288 unmodified lines | ||
| 1289 | 1289 | |
| 1290 | 1290 | wcd->rx_port_value[port_id] = ucontrol->value.enumerated.item[0]; |
| 1291 | 1291 | |
| 1292 | + /* Remove channel from any list it's in before adding it to a new one */ | |
| 1293 | + list_del_init(&wcd->rx_chs[port_id].list); | |
| 1294 | + | |
| 1292 | 1295 | switch (wcd->rx_port_value[port_id]) { |
| 1293 | 1296 | case 0: |
| 1294 | − list_del_init(&wcd->rx_chs[port_id].list); | |
| 1297 | + /* Channel already removed from lists. Nothing to do here */ | |
| 1295 | 1298 | break; |
| 1296 | 1299 | case 1: |
| 1297 | 1300 | list_add_tail(&wcd->rx_chs[port_id].list, |