linux-kernel - [PATCH 4.9 02/32] ALSA: hda/ca0132 - Fix work handling in delayed HP detection

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Date:   Thu,  7 Jan 2021 15:16:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.9 02/32] ALSA: hda/ca0132 - Fix work handling in delayed HP detection

From: Takashi Iwai <tiwai@...e.de>

commit 42fb6b1d41eb5905d77c06cad2e87b70289bdb76 upstream

CA0132 has the delayed HP jack detection code that is invoked from the
unsol handler, but it does a few weird things: it contains the cancel
of a work inside the work handler, and yet it misses the cancel-sync
call at (runtime-)suspend.  This patch addresses those issues.

Fixes: 15c2b3cc09a3 ("ALSA: hda/ca0132 - Fix possible workqueue stall")
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20191213085111.22855-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/pci/hda/patch_ca0132.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -4443,11 +4443,10 @@ static void hp_callback(struct hda_codec
 	/* Delay enabling the HP amp, to let the mic-detection
 	 * state machine run.
 	 */
-	cancel_delayed_work(&spec->unsol_hp_work);
-	schedule_delayed_work(&spec->unsol_hp_work, msecs_to_jiffies(500));
 	tbl = snd_hda_jack_tbl_get(codec, cb->nid);
 	if (tbl)
 		tbl->block_report = 1;
+	schedule_delayed_work(&spec->unsol_hp_work, msecs_to_jiffies(500));
 }
 
 static void amic_callback(struct hda_codec *codec, struct hda_jack_callback *cb)
@@ -4625,12 +4624,25 @@ static void ca0132_free(struct hda_codec
 	kfree(codec->spec);
 }
 
+#ifdef CONFIG_PM
+static int ca0132_suspend(struct hda_codec *codec)
+{
+	struct ca0132_spec *spec = codec->spec;
+
+	cancel_delayed_work_sync(&spec->unsol_hp_work);
+	return 0;
+}
+#endif
+
 static const struct hda_codec_ops ca0132_patch_ops = {
 	.build_controls = ca0132_build_controls,
 	.build_pcms = ca0132_build_pcms,
 	.init = ca0132_init,
 	.free = ca0132_free,
 	.unsol_event = snd_hda_jack_unsol_event,
+#ifdef CONFIG_PM
+	.suspend = ca0132_suspend,
+#endif
 };
 
 static void ca0132_config(struct hda_codec *codec)