ALSA: jack: Allow building the jack layer without input device

Since the recent integration of kctl jack and input jack layers, we
can basically build the jack layer even without input devices.  That
is, the jack layer itself can be built with conditional to enable the
input device support or not, while the users may enable always
CONFIG_SND_JACK unconditionally.

For achieving it, this patch changes the following:
- A new Kconfig, CONFIG_SND_JACK_INPUT_DEV, was introduced to indicate
  whether the jack layer supports the input device,
- A few items in snd_jack struct and relevant codes are conditionally
  built upon CONFIG_SND_JACK_INPUT_DEV,
- The users of CONFIG_SND_JACK drop the messy dependency on
  CONFIG_INPUT.

This change also automagically fixes a potential bug in HD-audio
driver Arnd reported, where the NULL or uninitialized jack instance is
dereferenced.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 26 insertions, 6 deletions

diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index a2a1e24becc6..6d12ca9bcb80 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -24,12 +24,15 @@ config SND_RAWMIDI
 config SND_COMPRESS_OFFLOAD
 	tristate
 
-# To be effective this also requires INPUT - users should say:
-#    select SND_JACK if INPUT=y || INPUT=SND
-# to avoid having to force INPUT on.
 config SND_JACK
 	bool
 
+# enable input device support in jack layer
+config SND_JACK_INPUT_DEV
+	bool
+	depends on SND_JACK
+	default y if INPUT=y || INPUT=SND
+
 config SND_SEQUENCER
 	tristate "Sequencer support"
 	select SND_TIMER
diff --git a/sound/core/jack.c b/sound/core/jack.c
index 7237acbdcbbc..f652e90efd7e 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -32,6 +32,7 @@ struct snd_jack_kctl {
 	unsigned int mask_bits; /* only masked status bits are reported via kctl */
 };
 
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
 	SW_HEADPHONE_INSERT,
 	SW_MICROPHONE_INSERT,
@@ -40,9 +41,11 @@ static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
 	SW_VIDEOOUT_INSERT,
 	SW_LINEIN_INSERT,
 };
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 
 static int snd_jack_dev_disconnect(struct snd_device *device)
 {
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 	struct snd_jack *jack = device->device_data;
 
 	if (!jack->input_dev)
@@ -55,6 +58,7 @@ static int snd_jack_dev_disconnect(struct snd_device *device)
 	else
 		input_free_device(jack->input_dev);
 	jack->input_dev = NULL;
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 	return 0;
 }
 
@@ -79,6 +83,7 @@ static int snd_jack_dev_free(struct snd_device *device)
 	return 0;
 }
 
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 static int snd_jack_dev_register(struct snd_device *device)
 {
 	struct snd_jack *jack = device->device_data;
@@ -116,6 +121,7 @@ static int snd_jack_dev_register(struct snd_device *device)
 
 	return err;
 }
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 
 static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
 {
@@ -209,11 +215,12 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
 	struct snd_jack *jack;
 	struct snd_jack_kctl *jack_kctl = NULL;
 	int err;
-	int i;
 	static struct snd_device_ops ops = {
 		.dev_free = snd_jack_dev_free,
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 		.dev_register = snd_jack_dev_register,
 		.dev_disconnect = snd_jack_dev_disconnect,
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 	};
 
 	if (initial_kctl) {
@@ -230,6 +237,9 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
 
 	/* don't creat input device for phantom jack */
 	if (!phantom_jack) {
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+		int i;
+
 		jack->input_dev = input_allocate_device();
 		if (jack->input_dev == NULL) {
 			err = -ENOMEM;
@@ -245,6 +255,7 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
 				input_set_capability(jack->input_dev, EV_SW,
 						     jack_switch_types[i]);
 
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 	}
 
 	err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
@@ -262,13 +273,16 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
 	return 0;
 
 fail_input:
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 	input_free_device(jack->input_dev);
+#endif
 	kfree(jack->id);
 	kfree(jack);
 	return err;
 }
 EXPORT_SYMBOL(snd_jack_new);
 
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 /**
  * snd_jack_set_parent - Set the parent device for a jack
  *
@@ -326,10 +340,10 @@ int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
 
 	jack->type |= type;
 	jack->key[key] = keytype;
-
 	return 0;
 }
 EXPORT_SYMBOL(snd_jack_set_key);
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 
 /**
  * snd_jack_report - Report the current status of a jack
@@ -340,7 +354,9 @@ EXPORT_SYMBOL(snd_jack_set_key);
 void snd_jack_report(struct snd_jack *jack, int status)
 {
 	struct snd_jack_kctl *jack_kctl;
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 	int i;
+#endif
 
 	if (!jack)
 		return;
@@ -349,6 +365,7 @@ void snd_jack_report(struct snd_jack *jack, int status)
 		snd_kctl_jack_report(jack->card, jack_kctl->kctl,
 					    status & jack_kctl->mask_bits);
 
+#ifdef CONFIG_SND_JACK_INPUT_DEV
 	if (!jack->input_dev)
 		return;
 
@@ -369,6 +386,6 @@ void snd_jack_report(struct snd_jack *jack, int status)
 	}
 
 	input_sync(jack->input_dev);
-
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
 }
 EXPORT_SYMBOL(snd_jack_report);