ALSA: usbaudio: fix suspend/resume

- ESHUTDOWN must be correctly handled
- the optional interrupt endpoint's URB must be stopped and restarted

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 34 insertions, 3 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index c0f8270bc199..7fa53d91e73b 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -586,6 +586,7 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
         struct snd_usb_audio *chip = usb_get_intfdata(intf);
         struct list_head *p;
         struct snd_usb_stream *as;
+        struct usb_mixer_interface *mixer;
 
         if (chip == (void *)-1L)
                 return 0;
@@ -596,6 +597,10 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
                         as = list_entry(p, struct snd_usb_stream, list);
                         snd_pcm_suspend_all(as->pcm);
                 }
+
+                list_for_each_entry(mixer, &chip->mixer_list, list) {
+                        snd_usb_mixer_inactivate(mixer);
+                }
         }
 
         return 0;
@@ -604,6 +609,7 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 static int usb_audio_resume(struct usb_interface *intf)
 {
         struct snd_usb_audio *chip = usb_get_intfdata(intf);
+        struct usb_mixer_interface *mixer;
 
         if (chip == (void *)-1L)
                 return 0;
@@ -611,8 +617,10 @@ static int usb_audio_resume(struct usb_interface *intf)
                 return 0;
         /*
          * ALSA leaves material resumption to user space
-         * we just notify
+         * we just notify and restart the mixers
          */
+        list_for_each_entry(mixer, &chip->mixer_list, list)
+                snd_usb_mixer_activate(mixer);
 
         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
 
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 675a4f1b5de1..09e59345bb6d 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2075,8 +2075,9 @@ static void snd_usb_mixer_interrupt(struct urb *urb)
 {
         struct usb_mixer_interface *mixer = urb->context;
         int len = urb->actual_length;
+        int ustatus = urb->status;
 
-        if (urb->status != 0)
+        if (ustatus != 0)
                 goto requeue;
 
         if (mixer->protocol == UAC_VERSION_1) {
@@ -2117,12 +2118,32 @@ static void snd_usb_mixer_interrupt(struct urb *urb)
         }
 
 requeue:
-        if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
+        if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
                 urb->dev = mixer->chip->dev;
                 usb_submit_urb(urb, GFP_ATOMIC);
         }
 }
 
+/* stop any bus activity of a mixer */
+void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
+{
+        usb_kill_urb(mixer->urb);
+        usb_kill_urb(mixer->rc_urb);
+}
+
+int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
+{
+        int err;
+
+        if (mixer->urb) {
+                err = usb_submit_urb(mixer->urb, GFP_NOIO);
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+}
+
 /* create the handler for the optional status interrupt endpoint */
 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
 {
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 26c636c5c93a..b4a2c8165e4b 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -52,5 +52,7 @@ void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid);
 
 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
                                 int request, int validx, int value_set);
+void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer);
+int snd_usb_mixer_activate(struct usb_mixer_interface *mixer);
 
 #endif /* __USBMIXER_H */