drivers/core/device-remove.c

   1 /*
   2  * Device manager
   3  *
   4  * Copyright (c) 2014 Google, Inc
   5  *
   6  * (C) Copyright 2012
   7  * Pavel Herrmann <morpheus.ibis@gmail.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <errno.h>
  14 #include <malloc.h>
  15 #include <dm/device.h>
  16 #include <dm/device-internal.h>
  17 #include <dm/uclass.h>
  18 #include <dm/uclass-internal.h>
  19 #include <dm/util.h>
  20
  21 int device_unbind_children(struct udevice *dev)
  22 {
  23         struct udevice *pos, *n;
  24         int ret, saved_ret = 0;
  25
  26         assert(dev);
  27
  28         list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
  29                 ret = device_unbind(pos);
  30                 if (ret && !saved_ret)
  31                         saved_ret = ret;
  32         }
  33
  34         return saved_ret;
  35 }
  36
  37 int device_remove_children(struct udevice *dev)
  38 {
  39         struct udevice *pos, *n;
  40         int ret;
  41
  42         assert(dev);
  43
  44         list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
  45                 ret = device_remove(pos);
  46                 if (ret)
  47                         return ret;
  48         }
  49
  50         return 0;
  51 }
  52
  53 int device_unbind(struct udevice *dev)
  54 {
  55         const struct driver *drv;
  56         int ret;
  57
  58         if (!dev)
  59                 return -EINVAL;
  60
  61         if (dev->flags & DM_FLAG_ACTIVATED)
  62                 return -EINVAL;
  63
  64         drv = dev->driver;
  65         assert(drv);
  66
  67         if (drv->unbind) {
  68                 ret = drv->unbind(dev);
  69                 if (ret)
  70                         return ret;
  71         }
  72
  73         ret = device_unbind_children(dev);
  74         if (ret)
  75                 return ret;
  76
  77         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
  78                 free(dev->platdata);
  79                 dev->platdata = NULL;
  80         }
  81         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
  82                 free(dev->uclass_platdata);
  83                 dev->uclass_platdata = NULL;
  84         }
  85         if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
  86                 free(dev->parent_platdata);
  87                 dev->parent_platdata = NULL;
  88         }
  89         ret = uclass_unbind_device(dev);
  90         if (ret)
  91                 return ret;
  92
  93         if (dev->parent)
  94                 list_del(&dev->sibling_node);
  95         free(dev);
  96
  97         return 0;
  98 }
  99
 100 /**
 101  * device_free() - Free memory buffers allocated by a device
 102  * @dev:        Device that is to be started
 103  */
 104 void device_free(struct udevice *dev)
 105 {
 106         int size;
 107
 108         if (dev->driver->priv_auto_alloc_size) {
 109                 free(dev->priv);
 110                 dev->priv = NULL;
 111         }
 112         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
 113         if (size) {
 114                 free(dev->uclass_priv);
 115                 dev->uclass_priv = NULL;
 116         }
 117         if (dev->parent) {
 118                 size = dev->parent->driver->per_child_auto_alloc_size;
 119                 if (!size) {
 120                         size = dev->parent->uclass->uc_drv->
 121                                         per_child_auto_alloc_size;
 122                 }
 123                 if (size) {
 124                         free(dev->parent_priv);
 125                         dev->parent_priv = NULL;
 126                 }
 127         }
 128 }
 129
 130 int device_remove(struct udevice *dev)
 131 {
 132         const struct driver *drv;
 133         int ret;
 134
 135         if (!dev)
 136                 return -EINVAL;
 137
 138         if (!(dev->flags & DM_FLAG_ACTIVATED))
 139                 return 0;
 140
 141         drv = dev->driver;
 142         assert(drv);
 143
 144         ret = uclass_pre_remove_device(dev);
 145         if (ret)
 146                 return ret;
 147
 148         ret = device_remove_children(dev);
 149         if (ret)
 150                 goto err;
 151
 152         if (drv->remove) {
 153                 ret = drv->remove(dev);
 154                 if (ret)
 155                         goto err_remove;
 156         }
 157
 158         if (dev->parent && dev->parent->driver->child_post_remove) {
 159                 ret = dev->parent->driver->child_post_remove(dev);
 160                 if (ret) {
 161                         dm_warn("%s: Device '%s' failed child_post_remove()",
 162                                 __func__, dev->name);
 163                 }
 164         }
 165
 166         device_free(dev);
 167
 168         dev->seq = -1;
 169         dev->flags &= ~DM_FLAG_ACTIVATED;
 170
 171         return ret;
 172
 173 err_remove:
 174         /* We can't put the children back */
 175         dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
 176                 __func__, dev->name);
 177 err:
 178         ret = uclass_post_probe_device(dev);
 179         if (ret) {
 180                 dm_warn("%s: Device '%s' failed to post_probe on error path\n",
 181                         __func__, dev->name);
 182         }
 183
 184         return ret;
 185 }