ALSA: hda: Fix headset detection failure due to unstable sort

stable inclusion
from stable-6.6.78
commit 3cef733e15cd8357bef2d713890a8d4884a990cc
category: bugfix
issue: #IC2PN8
CVE: NA

Signed-off-by: zyf1116 <[email protected]>
---------------------------------------

commit 3b4309546b48fc167aa615a2d881a09c0a97971f upstream.

The auto_parser assumed sort() was stable, but the kernel's sort() uses
heapsort, which has never been stable. After commit 0e02ca29a563
("lib/sort: optimize heapsort with double-pop variation"), the order of
equal elements changed, causing the headset to fail to work.

Fix the issue by recording the original order of elements before
sorting and using it as a tiebreaker for equal elements in the
comparison function.

Fixes: b9030a0 ("ALSA: hda - Use standard sort function in hda_auto_parser.c")
Reported-by: Austrum <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219158
Tested-by: Austrum <[email protected]>
Cc: [email protected]
Signed-off-by: Kuan-Wei Chiu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: zyf1116 <[email protected]>

Author: visitorckw

sound/pci/hda/hda_auto_parser.c

@@ -80,7 +80,11 @@ static int compare_input_type(const void *ap, const void *bp)
 
 	/* In case one has boost and the other one has not,
 	   pick the one with boost first. */
-	return (int)(b->has_boost_on_pin - a->has_boost_on_pin);
+	if (a->has_boost_on_pin != b->has_boost_on_pin)
+		return (int)(b->has_boost_on_pin - a->has_boost_on_pin);
+
+	/* Keep the original order */
+	return a->order - b->order;
 }
 
 /* Reorder the surround channels
@@ -400,6 +404,8 @@ int snd_hda_parse_pin_defcfg(struct hda_codec *codec,
 	reorder_outputs(cfg->speaker_outs, cfg->speaker_pins);
 
 	/* sort inputs in the order of AUTO_PIN_* type */
+	for (i = 0; i < cfg->num_inputs; i++)
+		cfg->inputs[i].order = i;
 	sort(cfg->inputs, cfg->num_inputs, sizeof(cfg->inputs[0]),
 	     compare_input_type, NULL);
 

sound/pci/hda/hda_auto_parser.h

@@ -37,6 +37,7 @@ struct auto_pin_cfg_item {
 	unsigned int is_headset_mic:1;
 	unsigned int is_headphone_mic:1; /* Mic-only in headphone jack */
 	unsigned int has_boost_on_pin:1;
+	int order;
 };
 
 struct auto_pin_cfg;