git.librecmc.org Git - oweals/openwrt.git/blob

   1 From 1120b4699738a3ee748314c433a96e45182a3411 Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Tue, 4 Sep 2018 17:58:33 +0200
   4 Subject: [PATCH] staging: bcm2835-audio: Remove redundant substream
   5  mask checks
   6
   7 commit 14b1f4cba853a11c7b381ad919622f38eb194bd7 upstream.
   8
   9 The avail_substreams bit mask is checked for the possible racy
  10 accesses, but this cannot happen in practice; i.e. the assignment and
  11 the check are superfluous.
  12
  13 Let's rip them off.
  14
  15 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  16 Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18 ---
  19  .../vc04_services/bcm2835-audio/bcm2835-ctl.c   |  2 --
  20  .../vc04_services/bcm2835-audio/bcm2835-pcm.c   |  8 --------
  21  .../vc04_services/bcm2835-audio/bcm2835-vchiq.c | 17 +++++++----------
  22  .../vc04_services/bcm2835-audio/bcm2835.c       |  5 +----
  23  .../vc04_services/bcm2835-audio/bcm2835.h       |  2 --
  24  5 files changed, 8 insertions(+), 26 deletions(-)
  25
  26 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
  27 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-ctl.c
  28 @@ -64,8 +64,6 @@ static int snd_bcm2835_ctl_get(struct sn
  29
  30         mutex_lock(&chip->audio_mutex);
  31
  32 -       BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
  33 -
  34         if (kcontrol->private_value == PCM_PLAYBACK_VOLUME)
  35                 ucontrol->value.integer.value[0] = chip2alsa(chip->volume);
  36         else if (kcontrol->private_value == PCM_PLAYBACK_MUTE)
  37 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  38 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  39 @@ -118,14 +118,6 @@ static int snd_bcm2835_playback_open_gen
  40                 goto out;
  41         }
  42
  43 -       /* Check if we are ready */
  44 -       if (!(chip->avail_substreams & (1 << idx))) {
  45 -               /* We are not ready yet */
  46 -               audio_error("substream(%d) device is not ready yet\n", idx);
  47 -               err = -EAGAIN;
  48 -               goto out;
  49 -       }
  50 -
  51         alsa_stream = kzalloc(sizeof(*alsa_stream), GFP_KERNEL);
  52         if (!alsa_stream) {
  53                 err = -ENOMEM;
  54 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
  55 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
  56 @@ -523,16 +523,13 @@ int bcm2835_audio_set_ctls(struct bcm283
  57
  58         /* change ctls for all substreams */
  59         for (i = 0; i < MAX_SUBSTREAMS; i++) {
  60 -               if (chip->avail_substreams & (1 << i)) {
  61 -                       if (!chip->alsa_stream[i]) {
  62 -                               LOG_DBG(" No ALSA stream available?! %i:%p (%x)\n", i, chip->alsa_stream[i], chip->avail_substreams);
  63 -                               ret = 0;
  64 -                       } else if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) {
  65 -                               LOG_ERR("Couldn't set the controls for stream %d\n", i);
  66 -                               ret = -1;
  67 -                       } else {
  68 -                               LOG_DBG(" Controls set for stream %d\n", i);
  69 -                       }
  70 +               if (!chip->alsa_stream[i])
  71 +                       continue;
  72 +               if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) {
  73 +                       LOG_ERR("Couldn't set the controls for stream %d\n", i);
  74 +                       ret = -1;
  75 +               } else {
  76 +                       LOG_DBG(" Controls set for stream %d\n", i);
  77                 }
  78         }
  79         return ret;
  80 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
  81 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
  82 @@ -280,7 +280,7 @@ static int snd_add_child_device(struct d
  83         struct snd_card *card;
  84         struct device *child;
  85         struct bcm2835_chip *chip;
  86 -       int err, i;
  87 +       int err;
  88
  89         child = snd_create_device(device, &audio_driver->driver,
  90                                   audio_driver->driver.name);
  91 @@ -325,9 +325,6 @@ static int snd_add_child_device(struct d
  92                 return err;
  93         }
  94
  95 -       for (i = 0; i < numchans; i++)
  96 -               chip->avail_substreams |= (1 << i);
  97 -
  98         err = snd_card_register(card);
  99         if (err) {
 100                 dev_err(child, "Failed to register card, error %d\n", err);
 101 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
 102 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
 103 @@ -98,8 +98,6 @@ struct bcm2835_chip {
 104         struct snd_card *card;
 105         struct snd_pcm *pcm;
 106         struct snd_pcm *pcm_spdif;
 107 -       /* Bitmat for valid reg_base and irq numbers */
 108 -       unsigned int avail_substreams;
 109         struct device *dev;
 110         struct bcm2835_alsa_stream *alsa_stream[MAX_SUBSTREAMS];
 111