ALSA: line6: podhd: Rewrite complex timer & work combo with a delayed work

POD HD driver had a complex staged startup sequence with both timer
and work.  This patch simplifies it to a single delayed work with a
single stage.

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

diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index 5f3c872..722fc5d 100644 (file)
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -22,16 +22,6 @@
 
 #define PODHD_STARTUP_DELAY 500
 
-/*
- * Stages of POD startup procedure
- */
-enum {
-       PODHD_STARTUP_INIT = 1,
-       PODHD_STARTUP_SCHEDULE_WORKQUEUE,
-       PODHD_STARTUP_SETUP,
-       PODHD_STARTUP_LAST = PODHD_STARTUP_SETUP - 1
-};
-
 enum {
        LINE6_PODHD300,
        LINE6_PODHD400,
@@ -47,15 +37,6 @@ struct usb_line6_podhd {
        /* Generic Line 6 USB data */
        struct usb_line6 line6;
 
-       /* Timer for device initialization */
-       struct timer_list startup_timer;
-
-       /* Work handler for device initialization */
-       struct work_struct startup_work;
-
-       /* Current progress in startup procedure */
-       int startup_progress;
-
        /* Serial number of device */
        u32 serial_number;
 
@@ -158,10 +139,6 @@ static struct line6_pcm_properties podx3_pcm_properties = {
 };
 static struct usb_driver podhd_driver;
 
-static void podhd_startup_start_workqueue(struct timer_list *t);
-static void podhd_startup_workqueue(struct work_struct *work);
-static int podhd_startup_finalize(struct usb_line6_podhd *pod);
-
 static ssize_t serial_number_show(struct device *dev,
                                  struct device_attribute *attr, char *buf)
 {
@@ -202,26 +179,6 @@ static const struct attribute_group podhd_dev_attr_group = {
  * audio nor bulk interfaces to work.
  */
 
-static void podhd_startup(struct usb_line6_podhd *pod)
-{
-       CHECK_STARTUP_PROGRESS(pod->startup_progress, PODHD_STARTUP_INIT);
-
-       /* delay startup procedure: */
-       line6_start_timer(&pod->startup_timer, PODHD_STARTUP_DELAY,
-               podhd_startup_start_workqueue);
-}
-
-static void podhd_startup_start_workqueue(struct timer_list *t)
-{
-       struct usb_line6_podhd *pod = from_timer(pod, t, startup_timer);
-
-       CHECK_STARTUP_PROGRESS(pod->startup_progress,
-               PODHD_STARTUP_SCHEDULE_WORKQUEUE);
-
-       /* schedule work for global work queue: */
-       schedule_work(&pod->startup_work);
-}
-
 static int podhd_dev_start(struct usb_line6_podhd *pod)
 {
        int ret;
@@ -272,25 +229,14 @@ exit:
        return ret;
 }
 
-static void podhd_startup_workqueue(struct work_struct *work)
+static void podhd_startup(struct usb_line6 *line6)
 {
-       struct usb_line6_podhd *pod =
-           container_of(work, struct usb_line6_podhd, startup_work);
-
-       CHECK_STARTUP_PROGRESS(pod->startup_progress, PODHD_STARTUP_SETUP);
+       struct usb_line6_podhd *pod = (struct usb_line6_podhd *)line6;
 
        podhd_dev_start(pod);
        line6_read_serial_number(&pod->line6, &pod->serial_number);
-
-       podhd_startup_finalize(pod);
-}
-
-static int podhd_startup_finalize(struct usb_line6_podhd *pod)
-{
-       struct usb_line6 *line6 = &pod->line6;
-
-       /* ALSA audio interface: */
-       return snd_card_register(line6->card);
+       if (snd_card_register(line6->card))
+               dev_err(line6->ifcdev, "Failed to register POD HD card.\n");
 }
 
 static void podhd_disconnect(struct usb_line6 *line6)
@@ -300,9 +246,6 @@ static void podhd_disconnect(struct usb_line6 *line6)
        if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO) {
                struct usb_interface *intf;
 
-               del_timer_sync(&pod->startup_timer);
-               cancel_work_sync(&pod->startup_work);
-
                intf = usb_ifnum_to_if(line6->usbdev,
                                        pod->line6.properties->ctrl_if);
                if (intf)
@@ -321,9 +264,7 @@ static int podhd_init(struct usb_line6 *line6,
        struct usb_interface *intf;
 
        line6->disconnect = podhd_disconnect;
-
-       timer_setup(&pod->startup_timer, NULL, 0);
-       INIT_WORK(&pod->startup_work, podhd_startup_workqueue);
+       line6->startup = podhd_startup;
 
        if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
                /* claim the data interface */
@@ -362,11 +303,12 @@ static int podhd_init(struct usb_line6 *line6,
 
        if (!(pod->line6.properties->capabilities & LINE6_CAP_CONTROL_INFO)) {
                /* register USB audio system directly */
-               return podhd_startup_finalize(pod);
+               return snd_card_register(line6->card);
        }
 
        /* init device and delay registering */
-       podhd_startup(pod);
+       schedule_delayed_work(&line6->startup_work,
+                             msecs_to_jiffies(PODHD_STARTUP_DELAY));
        return 0;
 }