From 033e4040d453f1f7111e5957a54f3019eb089cc6 Mon Sep 17 00:00:00 2001
From: Hui Wang <hui.wang@canonical.com>
Date: Thu, 22 Oct 2020 11:02:21 +0800
Subject: [PATCH] ALSA: hda - Fix the return value if cb func is already registered
Git-commit: 033e4040d453f1f7111e5957a54f3019eb089cc6
Patch-mainline: v5.10-rc1
References: git-fixes

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>

---
 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
@@ -235,16 +235,21 @@ int snd_hda_jack_detect_state(struct hda
 }
 EXPORT_SYMBOL_GPL(snd_hda_jack_detect_state);
 
-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;
 }
 
 /**
@@ -268,7 +273,10 @@ snd_hda_jack_detect_enable_callback(stru
 	jack = snd_hda_jack_tbl_new(codec, nid);
 	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);