6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kuan-Wei Chiu visitorckw@gmail.com
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: b9030a005d58 ("ALSA: hda - Use standard sort function in hda_auto_parser.c") Reported-by: Austrum austrum.lab@gmail.com Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219158 Tested-by: Austrum austrum.lab@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Kuan-Wei Chiu visitorckw@gmail.com Link: https://patch.msgid.link/20250128165415.643223-1-visitorckw@gmail.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/pci/hda/hda_auto_parser.c | 8 +++++++- sound/pci/hda/hda_auto_parser.h | 1 + 2 files changed, 8 insertions(+), 1 deletion(-)
--- a/sound/pci/hda/hda_auto_parser.c +++ b/sound/pci/hda/hda_auto_parser.c @@ -80,7 +80,11 @@ static int compare_input_type(const void
/* 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_ 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);
--- a/sound/pci/hda/hda_auto_parser.h +++ b/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;