target/linux/brcm2708/patches-4.19/950-0379-staging-bcm2835-audio-Drop-useless-running-flag-and-.patch

   1 From e8a202b4d06a07ba42b91a1dd3c2d9e9cedff32d Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Tue, 4 Sep 2018 17:58:37 +0200
   4 Subject: [PATCH] staging: bcm2835-audio: Drop useless running flag and
   5  check
   6
   7 commit 02f2376321d75e78117f39ff81f215254ee6b4ef upstream.
   8
   9 The running flag of alsa_stream is basically useless.  The running
  10 state is strictly controlled in ALSA PCM core side, hence the check in
  11 PCM trigger and close callbacks are superfluous.
  12
  13 Also, the prefill ack at trigger start became superfluous nowadays
  14 with the ALSA PCM core update.
  15
  16 Let's rip them off.
  17
  18 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  19 Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
  20 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  21 ---
  22  .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 46 ++++---------------
  23  .../vc04_services/bcm2835-audio/bcm2835.h     |  1 -
  24  2 files changed, 8 insertions(+), 39 deletions(-)
  25
  26 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  27 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  28 @@ -187,19 +187,6 @@ static int snd_bcm2835_playback_close(st
  29
  30         audio_info("Alsa close\n");
  31
  32 -       /*
  33 -        * Call stop if it's still running. This happens when app
  34 -        * is force killed and we don't get a stop trigger.
  35 -        */
  36 -       if (alsa_stream->running) {
  37 -               int err;
  38 -
  39 -               err = bcm2835_audio_stop(alsa_stream);
  40 -               alsa_stream->running = 0;
  41 -               if (err)
  42 -                       audio_error(" Failed to STOP alsa device\n");
  43 -       }
  44 -
  45         alsa_stream->period_size = 0;
  46         alsa_stream->buffer_size = 0;
  47
  48 @@ -324,27 +311,13 @@ static int snd_bcm2835_pcm_trigger(struc
  49
  50         switch (cmd) {
  51         case SNDRV_PCM_TRIGGER_START:
  52 -               audio_debug("bcm2835_AUDIO_TRIGGER_START running=%d\n",
  53 -                       alsa_stream->running);
  54 -               if (!alsa_stream->running) {
  55 -                       err = bcm2835_audio_start(alsa_stream);
  56 -                       if (!err) {
  57 -                               alsa_stream->pcm_indirect.hw_io =
  58 -                                       alsa_stream->pcm_indirect.hw_data =
  59 -                                       bytes_to_frames(runtime,
  60 -                                       alsa_stream->pos);
  61 -                               substream->ops->ack(substream);
  62 -                               alsa_stream->running = 1;
  63 -                               alsa_stream->draining = 1;
  64 -                       } else {
  65 -                               audio_error(" Failed to START alsa device (%d)\n", err);
  66 -                       }
  67 -               }
  68 +               err = bcm2835_audio_start(alsa_stream);
  69 +               if (!err)
  70 +                       alsa_stream->draining = 1;
  71 +               else
  72 +                       audio_error(" Failed to START alsa device (%d)\n", err);
  73                 break;
  74         case SNDRV_PCM_TRIGGER_STOP:
  75 -               audio_debug
  76 -                       ("bcm2835_AUDIO_TRIGGER_STOP running=%d draining=%d\n",
  77 -                       alsa_stream->running, runtime->status->state == SNDRV_PCM_STATE_DRAINING);
  78                 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
  79                         audio_info("DRAINING\n");
  80                         alsa_stream->draining = 1;
  81 @@ -352,12 +325,9 @@ static int snd_bcm2835_pcm_trigger(struc
  82                         audio_info("DROPPING\n");
  83                         alsa_stream->draining = 0;
  84                 }
  85 -               if (alsa_stream->running) {
  86 -                       err = bcm2835_audio_stop(alsa_stream);
  87 -                       if (err != 0)
  88 -                               audio_error(" Failed to STOP alsa device (%d)\n", err);
  89 -                       alsa_stream->running = 0;
  90 -               }
  91 +               err = bcm2835_audio_stop(alsa_stream);
  92 +               if (err != 0)
  93 +                       audio_error(" Failed to STOP alsa device (%d)\n", err);
  94                 break;
  95         default:
  96                 err = -EINVAL;
  97 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
  98 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
  99 @@ -121,7 +121,6 @@ struct bcm2835_alsa_stream {
 100
 101         spinlock_t lock;
 102
 103 -       int running;
 104         int draining;
 105
 106         int channels;