diff options
| author | Hui Wang <hui.wang@canonical.com> | 2020-10-22 11:02:21 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-10-22 08:17:02 +0200 |
| commit | 033e4040d453f1f7111e5957a54f3019eb089cc6 (patch) | |
| tree | 9e0d2381a85ffae964ee1b506f880702afec6809 /sound | |
| parent | 7da4c510abff8ad47eb2d7cc9a97def5a411947f (diff) | |
| download | linux-033e4040d453f1f7111e5957a54f3019eb089cc6.tar.bz2 | |
ALSA: hda - Fix the return value if cb func is already registered
If the cb function is already registered, should return the pointer
of the structure hda_jack_callback which contains this cb func, but
instead it returns the NULL.
Now fix it by replacing func_is_already_in_callback_list() with
find_callback_from_list().
Fixes: f4794c6064a8 ("ALSA: hda - Don't register a cb func if it is registered already")
Reported-and-suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20201022030221.22393-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_jack.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/sound/pci/hda/hda_jack.c b/sound/pci/hda/hda_jack.c index ded4813f8b54..588059428d8f 100644 --- a/sound/pci/hda/hda_jack.c +++ b/sound/pci/hda/hda_jack.c @@ -275,16 +275,21 @@ 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) +static struct hda_jack_callback * +find_callback_from_list(struct hda_jack_tbl *jack, + hda_jack_callback_fn func) { struct hda_jack_callback *cb; + if (!func) + return NULL; + for (cb = jack->callback; cb; cb = cb->next) { if (cb->func == func) - return true; + return cb; } - return false; + + return NULL; } /** @@ -309,7 +314,10 @@ 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 && !func_is_already_in_callback_list(jack, func)) { + + callback = find_callback_from_list(jack, func); + + if (func && !callback) { callback = kzalloc(sizeof(*callback), GFP_KERNEL); if (!callback) return ERR_PTR(-ENOMEM); |