usb/gadget: f_midi: Replace tasklet with work

Currently a tasklet is used to transmit input substream buffer
data. However, tasklets have long been deprecated as being too
heavy on the system by running in irq context - and this is not
a performance critical path. If a higher priority process wants
to run, it must wait for the tasklet to finish before doing so.

Deferring work to a workqueue and executing in process context
should be fine considering the callback already does
f_midi_do_transmit() under the transmit_lock and thus changes in
semantics are ok regarding concurrency - tasklets being serialized
against itself.

Cc: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Link: https://lore.kernel.org/r/20210111042855.73289-1-dave@stgolabs.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 8fff995..71a1a26 100644 (file)
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -87,7 +87,7 @@ struct f_midi {
        struct snd_rawmidi_substream *out_substream[MAX_PORTS];
 
        unsigned long           out_triggered;
-       struct tasklet_struct   tasklet;
+       struct work_struct      work;
        unsigned int in_ports;
        unsigned int out_ports;
        int index;
@@ -698,9 +698,11 @@ drop_out:
        f_midi_drop_out_substreams(midi);
 }
 
-static void f_midi_in_tasklet(struct tasklet_struct *t)
+static void f_midi_in_work(struct work_struct *work)
 {
-       struct f_midi *midi = from_tasklet(midi, t, tasklet);
+       struct f_midi *midi;
+
+       midi = container_of(work, struct f_midi, work);
        f_midi_transmit(midi);
 }
 
@@ -737,7 +739,7 @@ static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
        VDBG(midi, "%s() %d\n", __func__, up);
        midi->in_ports_array[substream->number].active = up;
        if (up)
-               tasklet_hi_schedule(&midi->tasklet);
+               queue_work(system_highpri_wq, &midi->work);
 }
 
 static int f_midi_out_open(struct snd_rawmidi_substream *substream)
@@ -875,7 +877,7 @@ static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
        int status, n, jack = 1, i = 0, endpoint_descriptor_index = 0;
 
        midi->gadget = cdev->gadget;
-       tasklet_setup(&midi->tasklet, f_midi_in_tasklet);
+       INIT_WORK(&midi->work, f_midi_in_work);
        status = f_midi_register_card(midi);
        if (status < 0)
                goto fail_register;