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authorHui Wang <hui.wang@canonical.com>2020-10-22 11:02:21 +0800
committerTakashi Iwai <tiwai@suse.de>2020-10-22 08:17:02 +0200
commit033e4040d453f1f7111e5957a54f3019eb089cc6 (patch)
tree9e0d2381a85ffae964ee1b506f880702afec6809 /sound
parent7da4c510abff8ad47eb2d7cc9a97def5a411947f (diff)
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.c18
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);

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