The tasklet is an old API that should be deprecated, usually can be converted to another decent API. In USB-audio driver, a tasklet is still used in MIDI interface code for handling the output byte stream. It can be achieved gracefully with a work queued in the high-prio system workqueue.
This patch replaces the tasklet usage in USB-audio driver with a simple work.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/midi.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/sound/usb/midi.c b/sound/usb/midi.c index e8287a05e36b..c8213652470c 100644 --- a/sound/usb/midi.c +++ b/sound/usb/midi.c @@ -142,7 +142,7 @@ struct snd_usb_midi_out_endpoint { unsigned int active_urbs; unsigned int drain_urbs; int max_transfer; /* size of urb buffer */ - struct tasklet_struct tasklet; + struct work_struct work; unsigned int next_urb; spinlock_t buffer_lock;
@@ -344,9 +344,10 @@ static void snd_usbmidi_do_output(struct snd_usb_midi_out_endpoint *ep) spin_unlock_irqrestore(&ep->buffer_lock, flags); }
-static void snd_usbmidi_out_tasklet(struct tasklet_struct *t) +static void snd_usbmidi_out_work(struct work_struct *work) { - struct snd_usb_midi_out_endpoint *ep = from_tasklet(ep, t, tasklet); + struct snd_usb_midi_out_endpoint *ep = + container_of(work, struct snd_usb_midi_out_endpoint, work);
snd_usbmidi_do_output(ep); } @@ -1177,7 +1178,7 @@ static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream, snd_rawmidi_proceed(substream); return; } - tasklet_schedule(&port->ep->tasklet); + queue_work(system_highpri_wq, &port->ep->work); } }
@@ -1440,7 +1441,7 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi, }
spin_lock_init(&ep->buffer_lock); - tasklet_setup(&ep->tasklet, snd_usbmidi_out_tasklet); + INIT_WORK(&ep->work, snd_usbmidi_out_work); init_waitqueue_head(&ep->drain_wait);
for (i = 0; i < 0x10; ++i) @@ -1503,7 +1504,7 @@ void snd_usbmidi_disconnect(struct list_head *p) for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i) { struct snd_usb_midi_endpoint *ep = &umidi->endpoints[i]; if (ep->out) - tasklet_kill(&ep->out->tasklet); + cancel_work_sync(&ep->out->work); if (ep->out) { for (j = 0; j < OUTPUT_URBS; ++j) usb_kill_urb(ep->out->urbs[j].urb);