target/linux/brcm2708/patches-4.19/950-0378-staging-bcm2835-audio-Remove-superfluous-open-flag.patch

   1 From af2fe52ef43c1aa6a24d1c51ad3ccddc39a12c51 Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Tue, 4 Sep 2018 17:58:36 +0200
   4 Subject: [PATCH] staging: bcm2835-audio: Remove superfluous open flag
   5
   6 commit ad13924de6b07cb52714ea1809c57b2e72a24504 upstream.
   7
   8 All the alsa_stream->open flag checks in the current code are
   9 redundant, and they cannot be racy.  For the code simplification,
  10 let's remove the flag and its check.
  11
  12 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  13 Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
  14 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  15 ---
  16  .../staging/vc04_services/bcm2835-audio/bcm2835-pcm.c    | 9 ++-------
  17  drivers/staging/vc04_services/bcm2835-audio/bcm2835.h    | 1 -
  18  2 files changed, 2 insertions(+), 8 deletions(-)
  19
  20 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  21 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  22 @@ -57,8 +57,7 @@ void bcm2835_playback_fifo(struct bcm283
  23         audio_info("alsa_stream=%p substream=%p\n", alsa_stream,
  24                 alsa_stream ? alsa_stream->substream : 0);
  25
  26 -       if (alsa_stream->open)
  27 -               consumed = bcm2835_audio_retrieve_buffers(alsa_stream);
  28 +       consumed = bcm2835_audio_retrieve_buffers(alsa_stream);
  29
  30         /* We get called only if playback was triggered, So, the number of buffers we retrieve in
  31          * each iteration are the buffers that have been played out already
  32 @@ -154,7 +153,6 @@ static int snd_bcm2835_playback_open_gen
  33         chip->alsa_stream[idx] = alsa_stream;
  34
  35         chip->opened |= (1 << idx);
  36 -       alsa_stream->open = 1;
  37         alsa_stream->draining = 1;
  38
  39  out:
  40 @@ -205,10 +203,7 @@ static int snd_bcm2835_playback_close(st
  41         alsa_stream->period_size = 0;
  42         alsa_stream->buffer_size = 0;
  43
  44 -       if (alsa_stream->open) {
  45 -               alsa_stream->open = 0;
  46 -               bcm2835_audio_close(alsa_stream);
  47 -       }
  48 +       bcm2835_audio_close(alsa_stream);
  49         if (alsa_stream->chip)
  50                 alsa_stream->chip->alsa_stream[alsa_stream->idx] = NULL;
  51         /*
  52 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
  53 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
  54 @@ -121,7 +121,6 @@ struct bcm2835_alsa_stream {
  55
  56         spinlock_t lock;
  57
  58 -       int open;
  59         int running;
  60         int draining;
  61