target/linux/bcm27xx/patches-4.19/950-0400-staging-bcm2835-audio-Simplify-card-object-managemen.patch

   1 From b19ed31a1ced7b6d4c4c04967a509d91a134e5bb Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Tue, 4 Sep 2018 17:58:58 +0200
   4 Subject: [PATCH] staging: bcm2835-audio: Simplify card object
   5  management
   6
   7 commit 872ae2d63d516a2a3b9c833d8685afcfa7814542 upstream.
   8
   9 Instead of creating a dummy child device to manage the card object,
  10 just use devm stuff directly for releasing with snd_card_free().
  11 This results in a lot of code reduction.
  12
  13 Since the dummy child devices are gone, the device object to be passed
  14 to the memory allocator needs to be adjusted as well.
  15
  16 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  17 Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
  18 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  19 ---
  20  .../vc04_services/bcm2835-audio/bcm2835-pcm.c |   2 +-
  21  .../vc04_services/bcm2835-audio/bcm2835.c     | 120 +++++-------------
  22  2 files changed, 33 insertions(+), 89 deletions(-)
  23
  24 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  25 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  26 @@ -349,7 +349,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_c
  27                         &snd_bcm2835_playback_ops);
  28
  29         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
  30 -               chip->card->dev->parent, 128 * 1024, 128 * 1024);
  31 +               chip->card->dev, 128 * 1024, 128 * 1024);
  32
  33         if (spdif)
  34                 chip->pcm_spdif = pcm;
  35 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
  36 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
  37 @@ -22,38 +22,6 @@ module_param(enable_compat_alsa, bool, 0
  38  MODULE_PARM_DESC(enable_compat_alsa,
  39                  "Enables ALSA compatibility virtual audio device");
  40
  41 -static void snd_devm_unregister_child(struct device *dev, void *res)
  42 -{
  43 -       struct device *childdev = *(struct device **)res;
  44 -       struct bcm2835_chip *chip = dev_get_drvdata(childdev);
  45 -       struct snd_card *card = chip->card;
  46 -
  47 -       snd_card_free(card);
  48 -
  49 -       device_unregister(childdev);
  50 -}
  51 -
  52 -static int snd_devm_add_child(struct device *dev, struct device *child)
  53 -{
  54 -       struct device **dr;
  55 -       int ret;
  56 -
  57 -       dr = devres_alloc(snd_devm_unregister_child, sizeof(*dr), GFP_KERNEL);
  58 -       if (!dr)
  59 -               return -ENOMEM;
  60 -
  61 -       ret = device_add(child);
  62 -       if (ret) {
  63 -               devres_free(dr);
  64 -               return ret;
  65 -       }
  66 -
  67 -       *dr = child;
  68 -       devres_add(dev, dr);
  69 -
  70 -       return 0;
  71 -}
  72 -
  73  static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
  74  {
  75         struct bcm2835_vchi_ctx *vchi_ctx = res;
  76 @@ -84,36 +52,6 @@ static int bcm2835_devm_add_vchi_ctx(str
  77         return 0;
  78  }
  79
  80 -static void snd_bcm2835_release(struct device *dev)
  81 -{
  82 -}
  83 -
  84 -static struct device *
  85 -snd_create_device(struct device *parent,
  86 -                 struct device_driver *driver,
  87 -                 const char *name)
  88 -{
  89 -       struct device *device;
  90 -       int ret;
  91 -
  92 -       device = devm_kzalloc(parent, sizeof(*device), GFP_KERNEL);
  93 -       if (!device)
  94 -               return ERR_PTR(-ENOMEM);
  95 -
  96 -       device_initialize(device);
  97 -       device->parent = parent;
  98 -       device->driver = driver;
  99 -       device->release = snd_bcm2835_release;
 100 -
 101 -       dev_set_name(device, "%s", name);
 102 -
 103 -       ret = snd_devm_add_child(parent, device);
 104 -       if (ret)
 105 -               return ERR_PTR(ret);
 106 -
 107 -       return device;
 108 -}
 109 -
 110  typedef int (*bcm2835_audio_newpcm_func)(struct bcm2835_chip *chip,
 111                                          const char *name,
 112                                          enum snd_bcm2835_route route,
 113 @@ -216,40 +154,36 @@ static struct bcm2835_audio_drivers chil
 114         },
 115  };
 116
 117 -static int snd_add_child_device(struct device *device,
 118 +static void bcm2835_card_free(void *data)
 119 +{
 120 +       snd_card_free(data);
 121 +}
 122 +
 123 +static int snd_add_child_device(struct device *dev,
 124                                 struct bcm2835_audio_driver *audio_driver,
 125                                 u32 numchans)
 126  {
 127         struct snd_card *card;
 128 -       struct device *child;
 129         struct bcm2835_chip *chip;
 130         int err;
 131
 132 -       child = snd_create_device(device, &audio_driver->driver,
 133 -                                 audio_driver->driver.name);
 134 -       if (IS_ERR(child)) {
 135 -               dev_err(device,
 136 -                       "Unable to create child device %p, error %ld",
 137 -                       audio_driver->driver.name,
 138 -                       PTR_ERR(child));
 139 -               return PTR_ERR(child);
 140 -       }
 141 -
 142 -       err = snd_card_new(child, -1, NULL, THIS_MODULE, sizeof(*chip), &card);
 143 +       err = snd_card_new(dev, -1, NULL, THIS_MODULE, sizeof(*chip), &card);
 144         if (err < 0) {
 145 -               dev_err(child, "Failed to create card");
 146 +               dev_err(dev, "Failed to create card");
 147                 return err;
 148         }
 149
 150         chip = card->private_data;
 151         chip->card = card;
 152 -       chip->dev = child;
 153 +       chip->dev = dev;
 154         mutex_init(&chip->audio_mutex);
 155
 156 -       chip->vchi_ctx = devres_find(device,
 157 +       chip->vchi_ctx = devres_find(dev,
 158                                      bcm2835_devm_free_vchi_ctx, NULL, NULL);
 159 -       if (!chip->vchi_ctx)
 160 -               return -ENODEV;
 161 +       if (!chip->vchi_ctx) {
 162 +               err = -ENODEV;
 163 +               goto error;
 164 +       }
 165
 166         strcpy(card->driver, audio_driver->driver.name);
 167         strcpy(card->shortname, audio_driver->shortname);
 168 @@ -259,26 +193,36 @@ static int snd_add_child_device(struct d
 169                 audio_driver->route,
 170                 numchans);
 171         if (err) {
 172 -               dev_err(child, "Failed to create pcm, error %d\n", err);
 173 -               return err;
 174 +               dev_err(dev, "Failed to create pcm, error %d\n", err);
 175 +               goto error;
 176         }
 177
 178         err = audio_driver->newctl(chip);
 179         if (err) {
 180 -               dev_err(child, "Failed to create controls, error %d\n", err);
 181 -               return err;
 182 +               dev_err(dev, "Failed to create controls, error %d\n", err);
 183 +               goto error;
 184         }
 185
 186         err = snd_card_register(card);
 187         if (err) {
 188 -               dev_err(child, "Failed to register card, error %d\n", err);
 189 -               return err;
 190 +               dev_err(dev, "Failed to register card, error %d\n", err);
 191 +               goto error;
 192         }
 193
 194 -       dev_set_drvdata(child, chip);
 195 -       dev_info(child, "card created with %d channels\n", numchans);
 196 +       dev_set_drvdata(dev, chip);
 197
 198 +       err = devm_add_action(dev, bcm2835_card_free, card);
 199 +       if (err < 0) {
 200 +               dev_err(dev, "Failed to add devm action, err %d\n", err);
 201 +               goto error;
 202 +       }
 203 +
 204 +       dev_info(dev, "card created with %d channels\n", numchans);
 205         return 0;
 206 +
 207 + error:
 208 +       snd_card_free(card);
 209 +       return err;
 210  }
 211
 212  static int snd_add_child_devices(struct device *device, u32 numchans)