[PATCH 5.9 060/757] ALSA: hda - Fix the return value if cb func is already registered

Greg Kroah-Hartman
2020-10-27T15:43:25Z

From: Hui Wang <hui.wang@canonical.com>

commit 033e4040d453f1f7111e5957a54f3019eb089cc6 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/pci/hda/hda_jack.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

--- 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
}
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(
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);