ALSA: Handle NULL jacks in snd_jack_report()

Facilitate drivers that wish to carry on if they can't create a jack
input device by handling attempts to report the state of a NULL jack,
removing the need to check for initialisation before use.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/core/jack.c b/sound/core/jack.c
index 8133a2b173a5..bd2d9e6b55e9 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -147,6 +147,9 @@ EXPORT_SYMBOL(snd_jack_set_parent);
  */
 void snd_jack_report(struct snd_jack *jack, int status)
 {
+        if (!jack)
+                return;
+
         if (jack->type & SND_JACK_HEADPHONE)
                 input_report_switch(jack->input_dev, SW_HEADPHONE_INSERT,
                                     status & SND_JACK_HEADPHONE);