[openwrt/staging/ynezz.git] /

From b19ed31a1ced7b6d4c4c04967a509d91a134e5bb Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 4 Sep 2018 17:58:58 +0200
Subject: [PATCH] staging: bcm2835-audio: Simplify card object
 management

commit 872ae2d63d516a2a3b9c833d8685afcfa7814542 upstream.

Instead of creating a dummy child device to manage the card object,
just use devm stuff directly for releasing with snd_card_free().
This results in a lot of code reduction.

Since the dummy child devices are gone, the device object to be passed
to the memory allocator needs to be adjusted as well.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 .../vc04_services/bcm2835-audio/bcm2835-pcm.c |   2 +-
 .../vc04_services/bcm2835-audio/bcm2835.c     | 120 +++++-------------
 2 files changed, 33 insertions(+), 89 deletions(-)

--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
@@ -349,7 +349,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_c
                        &snd_bcm2835_playback_ops);
 
        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
-               chip->card->dev->parent, 128 * 1024, 128 * 1024);
+               chip->card->dev, 128 * 1024, 128 * 1024);
 
        if (spdif)
                chip->pcm_spdif = pcm;
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -22,38 +22,6 @@ module_param(enable_compat_alsa, bool, 0
 MODULE_PARM_DESC(enable_compat_alsa,
                 "Enables ALSA compatibility virtual audio device");
 
-static void snd_devm_unregister_child(struct device *dev, void *res)
-{
-       struct device *childdev = *(struct device **)res;
-       struct bcm2835_chip *chip = dev_get_drvdata(childdev);
-       struct snd_card *card = chip->card;
-
-       snd_card_free(card);
-
-       device_unregister(childdev);
-}
-
-static int snd_devm_add_child(struct device *dev, struct device *child)
-{
-       struct device **dr;
-       int ret;
-
-       dr = devres_alloc(snd_devm_unregister_child, sizeof(*dr), GFP_KERNEL);
-       if (!dr)
-               return -ENOMEM;
-
-       ret = device_add(child);
-       if (ret) {
-               devres_free(dr);
-               return ret;
-       }
-
-       *dr = child;
-       devres_add(dev, dr);
-
-       return 0;
-}
-
 static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
 {
        struct bcm2835_vchi_ctx *vchi_ctx = res;
@@ -84,36 +52,6 @@ static int bcm2835_devm_add_vchi_ctx(str
        return 0;
 }
 
-static void snd_bcm2835_release(struct device *dev)
-{
-}
-
-static struct device *
-snd_create_device(struct device *parent,
-                 struct device_driver *driver,
-                 const char *name)
-{
-       struct device *device;
-       int ret;
-
-       device = devm_kzalloc(parent, sizeof(*device), GFP_KERNEL);
-       if (!device)
-               return ERR_PTR(-ENOMEM);
-
-       device_initialize(device);
-       device->parent = parent;
-       device->driver = driver;
-       device->release = snd_bcm2835_release;
-
-       dev_set_name(device, "%s", name);
-
-       ret = snd_devm_add_child(parent, device);
-       if (ret)
-               return ERR_PTR(ret);
-
-       return device;
-}
-
 typedef int (*bcm2835_audio_newpcm_func)(struct bcm2835_chip *chip,
                                         const char *name,
                                         enum snd_bcm2835_route route,
@@ -216,40 +154,36 @@ static struct bcm2835_audio_drivers chil
        },
 };
 
-static int snd_add_child_device(struct device *device,
+static void bcm2835_card_free(void *data)
+{
+       snd_card_free(data);
+}
+
+static int snd_add_child_device(struct device *dev,
                                struct bcm2835_audio_driver *audio_driver,
                                u32 numchans)
 {
        struct snd_card *card;
-       struct device *child;
        struct bcm2835_chip *chip;
        int err;
 
-       child = snd_create_device(device, &audio_driver->driver,
-                                 audio_driver->driver.name);
-       if (IS_ERR(child)) {
-               dev_err(device,
-                       "Unable to create child device %p, error %ld",
-                       audio_driver->driver.name,
-                       PTR_ERR(child));
-               return PTR_ERR(child);
-       }
-
-       err = snd_card_new(child, -1, NULL, THIS_MODULE, sizeof(*chip), &card);
+       err = snd_card_new(dev, -1, NULL, THIS_MODULE, sizeof(*chip), &card);
        if (err < 0) {
-               dev_err(child, "Failed to create card");
+               dev_err(dev, "Failed to create card");
                return err;
        }
 
        chip = card->private_data;
        chip->card = card;
-       chip->dev = child;
+       chip->dev = dev;
        mutex_init(&chip->audio_mutex);
 
-       chip->vchi_ctx = devres_find(device,
+       chip->vchi_ctx = devres_find(dev,
                                     bcm2835_devm_free_vchi_ctx, NULL, NULL);
-       if (!chip->vchi_ctx)
-               return -ENODEV;
+       if (!chip->vchi_ctx) {
+               err = -ENODEV;
+               goto error;
+       }
 
        strcpy(card->driver, audio_driver->driver.name);
        strcpy(card->shortname, audio_driver->shortname);
@@ -259,26 +193,36 @@ static int snd_add_child_device(struct d
                audio_driver->route,
                numchans);
        if (err) {
-               dev_err(child, "Failed to create pcm, error %d\n", err);
-               return err;
+               dev_err(dev, "Failed to create pcm, error %d\n", err);
+               goto error;
        }
 
        err = audio_driver->newctl(chip);
        if (err) {
-               dev_err(child, "Failed to create controls, error %d\n", err);
-               return err;
+               dev_err(dev, "Failed to create controls, error %d\n", err);
+               goto error;
        }
 
        err = snd_card_register(card);
        if (err) {
-               dev_err(child, "Failed to register card, error %d\n", err);
-               return err;
+               dev_err(dev, "Failed to register card, error %d\n", err);
+               goto error;
        }
 
-       dev_set_drvdata(child, chip);
-       dev_info(child, "card created with %d channels\n", numchans);
+       dev_set_drvdata(dev, chip);
 
+       err = devm_add_action(dev, bcm2835_card_free, card);
+       if (err < 0) {
+               dev_err(dev, "Failed to add devm action, err %d\n", err);
+               goto error;
+       }
+
+       dev_info(dev, "card created with %d channels\n", numchans);
        return 0;
+
+ error:
+       snd_card_free(card);
+       return err;
 }
 
 static int snd_add_child_devices(struct device *device, u32 numchans)