[v2] NOTFORUPSTREAM sound/hda: add debug information in call_hp_automute

Commit Message

Martin Peres June 8, 2017, 2:17 p.m. UTC

I would like to send this patch to the core-for-CI branch, in order to
verify the theory I exposed in fdo#101246.

This patch also hides a potentially serious bug in the sound/hda
driver, which may improve our chances of not being affected by
bugs there. It may actually also fix some of the incompletes we see.

v2: use WARN() instead of printf with a custom string

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101246
---
 sound/pci/hda/hda_generic.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index 557ecfcad158..58dda5a52638 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -4471,7 +4471,15 @@  EXPORT_SYMBOL_GPL(snd_hda_gen_mic_autoswitch);
 static void call_hp_automute(struct hda_codec *codec,
 			     struct hda_jack_callback *jack)
 {
-	struct hda_gen_spec *spec = codec->spec;
+	struct hda_gen_spec *spec;
+
+	if (WARN(!codec, "call_hp_automute called with codec == NULL"))
+		return;
+
+	spec = codec->spec;
+    if (WARN(!spec, "call_hp_automute called with codec->spec == NULL"))
+		printk("INTEL-GFX-CI-WARN: ");
+
 	if (spec->hp_automute_hook)
 		spec->hp_automute_hook(codec, jack);
 	else