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ALSA: hda - Don't register a cb func if it is registered already

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If the caller of enable_callback_mst() passes a cb func, the callee
function will malloc memory and link this cb func to the list
unconditionally. This will introduce problem if caller is in the
hda_codec_ops.init() since the init() will be repeatedly called in the
codec rt_resume().

So far, the patch_hdmi.c and patch_ca0132.c call enable_callback_mst()
in the hda_codec_ops.init().

Signed-off-by: Hui Wang <hui.wang@canonical.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200930055146.5665-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Hui Wang 2020-09-30 13:51:46 +08:00 committed by Takashi Iwai
parent 13468bfa8c
commit f4794c6064
1 changed files with 13 additions and 1 deletions
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14
sound/pci/hda/hda_jack.c
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@ -275,6 +275,18 @@ int snd_hda_jack_detect_state_mst(struct hda_codec *codec,
}
EXPORT_SYMBOL_GPL(snd_hda_jack_detect_state_mst);
static bool func_is_already_in_callback_list(struct hda_jack_tbl *jack,
hda_jack_callback_fn func)
{
struct hda_jack_callback *cb;
for (cb = jack->callback; cb; cb = cb->next) {
if (cb->func == func)
return true;
}
return false;
}
/**
* snd_hda_jack_detect_enable_mst - enable the jack-detection
* @codec: the HDA codec
@ -297,7 +309,7 @@ snd_hda_jack_detect_enable_callback_mst(struct hda_codec *codec, hda_nid_t nid,
jack = snd_hda_jack_tbl_new(codec, nid, dev_id);
if (!jack)
return ERR_PTR(-ENOMEM);
if (func) {
if (func && !func_is_already_in_callback_list(jack, func)) {
callback = kzalloc(sizeof(*callback), GFP_KERNEL);
if (!callback)
return ERR_PTR(-ENOMEM);