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         if (!(dev->flags & DM_FLAG_BOUND))
  79                 return -EINVAL;
  80
  81         drv = dev->driver;
  82         assert(drv);
  83
  84         if (drv->unbind) {
  85                 ret = drv->unbind(dev);
  86                 if (ret)
  87                         return ret;
  88         }
  89
  90         ret = device_chld_unbind(dev);
  91         if (ret)
  92                 return ret;
  93
  94         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
  95                 free(dev->platdata);
  96                 dev->platdata = NULL;
  97         }
  98         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
  99                 free(dev->uclass_platdata);
 100                 dev->uclass_platdata = NULL;
 101         }
 102         if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
 103                 free(dev->parent_platdata);
 104                 dev->parent_platdata = NULL;
 105         }
 106         ret = uclass_unbind_device(dev);
 107         if (ret)
 108                 return ret;
 109
 110         if (dev->parent)
 111                 list_del(&dev->sibling_node);
 112
 113         devres_release_all(dev);
 114
 115         free(dev);
 116
 117         return 0;
 118 }
 119
 120 /**
 121  * device_free() - Free memory buffers allocated by a device
 122  * @dev:        Device that is to be started
 123  */
 124 void device_free(struct udevice *dev)
 125 {
 126         int size;
 127
 128         if (dev->driver->priv_auto_alloc_size) {
 129                 free(dev->priv);
 130                 dev->priv = NULL;
 131         }
 132         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
 133         if (size) {
 134                 free(dev->uclass_priv);
 135                 dev->uclass_priv = NULL;
 136         }
 137         if (dev->parent) {
 138                 size = dev->parent->driver->per_child_auto_alloc_size;
 139                 if (!size) {
 140                         size = dev->parent->uclass->uc_drv->
 141                                         per_child_auto_alloc_size;
 142                 }
 143                 if (size) {
 144                         free(dev->parent_priv);
 145                         dev->parent_priv = NULL;
 146                 }
 147         }
 148
 149         devres_release_probe(dev);
 150 }
 151
 152 int device_remove(struct udevice *dev)
 153 {
 154         const struct driver *drv;
 155         int ret;
 156
 157         if (!dev)
 158                 return -EINVAL;
 159
 160         if (!(dev->flags & DM_FLAG_ACTIVATED))
 161                 return 0;
 162
 163         drv = dev->driver;
 164         assert(drv);
 165
 166         ret = uclass_pre_remove_device(dev);
 167         if (ret)
 168                 return ret;
 169
 170         ret = device_chld_remove(dev);
 171         if (ret)
 172                 goto err;
 173
 174         if (drv->remove) {
 175                 ret = drv->remove(dev);
 176                 if (ret)
 177                         goto err_remove;
 178         }
 179
 180         if (dev->parent && dev->parent->driver->child_post_remove) {
 181                 ret = dev->parent->driver->child_post_remove(dev);
 182                 if (ret) {
 183                         dm_warn("%s: Device '%s' failed child_post_remove()",
 184                                 __func__, dev->name);
 185                 }
 186         }
 187
 188         device_free(dev);
 189
 190         dev->seq = -1;
 191         dev->flags &= ~DM_FLAG_ACTIVATED;
 192
 193         return ret;
 194
 195 err_remove:
 196         /* We can't put the children back */
 197         dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
 198                 __func__, dev->name);
 199 err:
 200         ret = uclass_post_probe_device(dev);
 201         if (ret) {
 202                 dm_warn("%s: Device '%s' failed to post_probe on error path\n",
 203                         __func__, dev->name);
 204         }
 205
 206         return ret;
 207 }