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ASoC: wcd9335: Remove RX channel from old list before adding it to a new one 

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.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Link: https://lore.kernel.org/r/20220606152226.149164-1-y.oudjana@protonmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Yassine Oudjana 2022-06-06 19:22:26 +04:00 committed by Mark Brown
parent 58136d93d4
commit be6dd72edb
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GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 1 deletions
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5
sound/soc/codecs/wcd9335.c
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@ -1289,9 +1289,12 @@ static int slim_rx_mux_put(struct snd_kcontrol *kc,
wcd->rx_port_value[port_id] = ucontrol->value.enumerated.item[0];
/* Remove channel from any list it's in before adding it to a new one */
list_del_init(&wcd->rx_chs[port_id].list);
switch (wcd->rx_port_value[port_id]) {
case 0:
list_del_init(&wcd->rx_chs[port_id].list);
/* Channel already removed from lists. Nothing to do here */
break;
case 1:
list_add_tail(&wcd->rx_chs[port_id].list,