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https://github.com/AsahiLinux/u-boot
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a2040facd2
Some devices have a name that is stored in allocated memory. At present there is no mechanism to free this memory when the device is unbound. Add a device flag to track whether a name is allocated and a function to add the flag. Free the memory when the device is unbound. Signed-off-by: Simon Glass <sjg@chromium.org>
209 lines
3.8 KiB
C
209 lines
3.8 KiB
C
/*
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* Device manager
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*
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* Copyright (c) 2014 Google, Inc
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*
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* (C) Copyright 2012
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <errno.h>
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#include <malloc.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/uclass.h>
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#include <dm/uclass-internal.h>
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#include <dm/util.h>
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/**
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* device_chld_unbind() - Unbind all device's children from the device
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*
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* On error, the function continues to unbind all children, and reports the
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* first error.
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*
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* @dev: The device that is to be stripped of its children
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* @return 0 on success, -ve on error
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*/
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static int device_chld_unbind(struct udevice *dev)
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{
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struct udevice *pos, *n;
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int ret, saved_ret = 0;
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assert(dev);
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list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
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ret = device_unbind(pos);
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if (ret && !saved_ret)
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saved_ret = ret;
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}
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return saved_ret;
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}
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/**
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* device_chld_remove() - Stop all device's children
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* @dev: The device whose children are to be removed
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* @return 0 on success, -ve on error
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*/
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static int device_chld_remove(struct udevice *dev)
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{
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struct udevice *pos, *n;
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int ret;
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assert(dev);
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list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
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ret = device_remove(pos);
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if (ret)
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return ret;
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}
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return 0;
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}
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int device_unbind(struct udevice *dev)
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{
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const struct driver *drv;
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int ret;
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if (!dev)
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return -EINVAL;
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if (dev->flags & DM_FLAG_ACTIVATED)
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return -EINVAL;
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if (!(dev->flags & DM_FLAG_BOUND))
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return -EINVAL;
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drv = dev->driver;
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assert(drv);
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if (drv->unbind) {
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ret = drv->unbind(dev);
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if (ret)
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return ret;
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}
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ret = device_chld_unbind(dev);
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if (ret)
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return ret;
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if (dev->flags & DM_FLAG_ALLOC_PDATA) {
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free(dev->platdata);
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dev->platdata = NULL;
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}
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if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
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free(dev->uclass_platdata);
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dev->uclass_platdata = NULL;
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}
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if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
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free(dev->parent_platdata);
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dev->parent_platdata = NULL;
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}
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ret = uclass_unbind_device(dev);
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if (ret)
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return ret;
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if (dev->parent)
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list_del(&dev->sibling_node);
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devres_release_all(dev);
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if (dev->flags & DM_NAME_ALLOCED)
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free((char *)dev->name);
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free(dev);
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return 0;
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}
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/**
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* device_free() - Free memory buffers allocated by a device
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* @dev: Device that is to be started
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*/
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void device_free(struct udevice *dev)
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{
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int size;
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if (dev->driver->priv_auto_alloc_size) {
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free(dev->priv);
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dev->priv = NULL;
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}
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size = dev->uclass->uc_drv->per_device_auto_alloc_size;
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if (size) {
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free(dev->uclass_priv);
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dev->uclass_priv = NULL;
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}
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if (dev->parent) {
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size = dev->parent->driver->per_child_auto_alloc_size;
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if (!size) {
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size = dev->parent->uclass->uc_drv->
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per_child_auto_alloc_size;
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}
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if (size) {
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free(dev->parent_priv);
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dev->parent_priv = NULL;
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}
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}
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devres_release_probe(dev);
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}
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int device_remove(struct udevice *dev)
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{
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const struct driver *drv;
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int ret;
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if (!dev)
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return -EINVAL;
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if (!(dev->flags & DM_FLAG_ACTIVATED))
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return 0;
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drv = dev->driver;
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assert(drv);
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ret = uclass_pre_remove_device(dev);
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if (ret)
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return ret;
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ret = device_chld_remove(dev);
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if (ret)
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goto err;
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if (drv->remove) {
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ret = drv->remove(dev);
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if (ret)
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goto err_remove;
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}
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if (dev->parent && dev->parent->driver->child_post_remove) {
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ret = dev->parent->driver->child_post_remove(dev);
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if (ret) {
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dm_warn("%s: Device '%s' failed child_post_remove()",
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__func__, dev->name);
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}
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}
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device_free(dev);
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dev->seq = -1;
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dev->flags &= ~DM_FLAG_ACTIVATED;
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return ret;
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err_remove:
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/* We can't put the children back */
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dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
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__func__, dev->name);
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err:
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ret = uclass_post_probe_device(dev);
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if (ret) {
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dm_warn("%s: Device '%s' failed to post_probe on error path\n",
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__func__, dev->name);
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}
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return ret;
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}
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