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 /**
  22  * device_chld_unbind() - Unbind all device's children from the device
  23  *
  24  * On error, the function continues to unbind all children, and reports the
  25  * first error.
  26  *
  27  * @dev:        The device that is to be stripped of its children
  28  * @return 0 on success, -ve on error
  29  */
  30 static int device_chld_unbind(struct udevice *dev)
  31 {
  32         struct udevice *pos, *n;
  33         int ret, saved_ret = 0;
  34
  35         assert(dev);
  36
  37         list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
  38                 ret = device_unbind(pos);
  39                 if (ret && !saved_ret)
  40                         saved_ret = ret;
  41         }
  42
  43         return saved_ret;
  44 }
  45
  46 /**
  47  * device_chld_remove() - Stop all device's children
  48  * @dev:        The device whose children are to be removed
  49  * @return 0 on success, -ve on error
  50  */
  51 static int device_chld_remove(struct udevice *dev)
  52 {
  53         struct udevice *pos, *n;
  54         int ret;
  55
  56         assert(dev);
  57
  58         list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
  59                 ret = device_remove(pos);
  60                 if (ret)
  61                         return ret;
  62         }
  63
  64         return 0;
  65 }
  66
  67 int device_unbind(struct udevice *dev)
  68 {
  69         const struct driver *drv;
  70         int ret;
  71
  72         if (!dev)
  73                 return -EINVAL;
  74
  75         if (dev->flags & DM_FLAG_ACTIVATED)
  76                 return -EINVAL;
  77
  78         drv = dev->driver;
  79         assert(drv);
  80
  81         if (drv->unbind) {
  82                 ret = drv->unbind(dev);
  83                 if (ret)
  84                         return ret;
  85         }
  86
  87         ret = device_chld_unbind(dev);
  88         if (ret)
  89                 return ret;
  90
  91         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
  92                 free(dev->platdata);
  93                 dev->platdata = NULL;
  94         }
  95         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
  96                 free(dev->uclass_platdata);
  97                 dev->uclass_platdata = NULL;
  98         }
  99         if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
 100                 free(dev->parent_platdata);
 101                 dev->parent_platdata = NULL;
 102         }
 103         ret = uclass_unbind_device(dev);
 104         if (ret)
 105                 return ret;
 106
 107         if (dev->parent)
 108                 list_del(&dev->sibling_node);
 109         free(dev);
 110
 111         return 0;
 112 }
 113
 114 /**
 115  * device_free() - Free memory buffers allocated by a device
 116  * @dev:        Device that is to be started
 117  */
 118 void device_free(struct udevice *dev)
 119 {
 120         int size;
 121
 122         if (dev->driver->priv_auto_alloc_size) {
 123                 free(dev->priv);
 124                 dev->priv = NULL;
 125         }
 126         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
 127         if (size) {
 128                 free(dev->uclass_priv);
 129                 dev->uclass_priv = NULL;
 130         }
 131         if (dev->parent) {
 132                 size = dev->parent->driver->per_child_auto_alloc_size;
 133                 if (!size) {
 134                         size = dev->parent->uclass->uc_drv->
 135                                         per_child_auto_alloc_size;
 136                 }
 137                 if (size) {
 138                         free(dev->parent_priv);
 139                         dev->parent_priv = NULL;
 140                 }
 141         }
 142 }
 143
 144 int device_remove(struct udevice *dev)
 145 {
 146         const struct driver *drv;
 147         int ret;
 148
 149         if (!dev)
 150                 return -EINVAL;
 151
 152         if (!(dev->flags & DM_FLAG_ACTIVATED))
 153                 return 0;
 154
 155         drv = dev->driver;
 156         assert(drv);
 157
 158         ret = uclass_pre_remove_device(dev);
 159         if (ret)
 160                 return ret;
 161
 162         ret = device_chld_remove(dev);
 163         if (ret)
 164                 goto err;
 165
 166         if (drv->remove) {
 167                 ret = drv->remove(dev);
 168                 if (ret)
 169                         goto err_remove;
 170         }
 171
 172         if (dev->parent && dev->parent->driver->child_post_remove) {
 173                 ret = dev->parent->driver->child_post_remove(dev);
 174                 if (ret) {
 175                         dm_warn("%s: Device '%s' failed child_post_remove()",
 176                                 __func__, dev->name);
 177                 }
 178         }
 179
 180         device_free(dev);
 181
 182         dev->seq = -1;
 183         dev->flags &= ~DM_FLAG_ACTIVATED;
 184
 185         return ret;
 186
 187 err_remove:
 188         /* We can't put the children back */
 189         dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
 190                 __func__, dev->name);
 191 err:
 192         ret = uclass_post_probe_device(dev);
 193         if (ret) {
 194                 dm_warn("%s: Device '%s' failed to post_probe on error path\n",
 195                         __func__, dev->name);
 196         }
 197
 198         return ret;
 199 }