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authorElena Oat <oat.elena@gmail.com>2014-03-19 08:49:44 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-19 12:13:37 -0400
commit5366f6f6852513579f9fb8ba092ecaa44456590b (patch)
treed912244a5fd9af581713a5434ed8cc3f45c56e9e /tools/perf/scripts/python/net_dropmonitor.py
parentbd18b0abc882ed4a585e05370eb9c7c12c8943ac (diff)
Staging: rtl8188eu: Fix warning of space prohibited.
This patch fixes the warning of "space prohibited before semicolon" in file rtw_efuse.c. Signed-off-by: Elena Oat <oat.elena@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/net_dropmonitor.py')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-27 01:12:32 -0400
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/* binder.c
 *
 * Android IPC Subsystem
 *
 * Copyright (C) 2007-2008 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <asm/cacheflush.h>
#include <linux/fdtable.h>
#include <linux/file.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/poll.h>
#include <linux/debugfs.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>

#include "binder.h"
#include "binder_trace.h"

static DEFINE_MUTEX(binder_main_lock);
static DEFINE_MUTEX(binder_deferred_lock);
static DEFINE_MUTEX(binder_mmap_lock);

static HLIST_HEAD(binder_procs);
static HLIST_HEAD(binder_deferred_list);
static HLIST_HEAD(binder_dead_nodes);

static struct dentry *binder_debugfs_dir_entry_root;
static struct dentry *binder_debugfs_dir_entry_proc;
static struct binder_node *binder_context_mgr_node;
static kuid_t binder_context_mgr_uid = INVALID_UID;
static int binder_last_id;
static struct workqueue_struct *binder_deferred_workqueue;

#define BINDER_DEBUG_ENTRY(name) \
static int binder_##name##_open(struct inode *inode, struct file *file) \
{ \
	return single_open(file, binder_##name##_show, inode->i_private); \
} \
\
static const struct file_operations binder_##name##_fops = { \
	.owner = THIS_MODULE, \
	.open = binder_##name##_open, \
	.read = seq_read, \
	.llseek = seq_lseek, \
	.release = single_release, \
}

static int binder_proc_show(struct seq_file *m, void *unused);
BINDER_DEBUG_ENTRY(proc);

/* This is only defined in include/asm-arm/sizes.h */
#ifndef SZ_1K
#define SZ_1K                               0x400
#endif

#ifndef SZ_4M
#define SZ_4M                               0x400000
#endif

#define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)

#define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)

enum {
	BINDER_DEBUG_USER_ERROR             = 1U << 0,
	BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
	BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
	BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
	BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
	BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
	BINDER_DEBUG_READ_WRITE             = 1U << 6,
	BINDER_DEBUG_USER_REFS              = 1U << 7,
	BINDER_DEBUG_THREADS                = 1U << 8,
	BINDER_DEBUG_TRANSACTION            = 1U << 9,
	BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
	BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
	BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
	BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
	BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
	BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
};
static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
	BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);

static bool binder_debug_no_lock;
module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);

static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
static int binder_stop_on_user_error;

static int binder_set_stop_on_user_error(const char *val,
					 struct kernel_param *kp)
{
	int ret;

	ret = param_set_int(val, kp);
	if (binder_stop_on_user_error < 2)
		wake_up(&binder_user_error_wait);
	return ret;
}
module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
	param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);

#define binder_debug(mask, x...) \
	do { \
		if (binder_debug_mask & mask) \
			pr_info(x); \
	} while (0)

#define binder_user_error(x...) \
	do { \
		if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
			pr_info(x); \
		if (binder_stop_on_user_error) \
			binder_stop_on_user_error = 2; \
	} while (0)

enum binder_stat_types {
	BINDER_STAT_PROC,
	BINDER_STAT_THREAD,
	BINDER_STAT_NODE,
	BINDER_STAT_REF,
	BINDER_STAT_DEATH,
	BINDER_STAT_TRANSACTION,
	BINDER_STAT_TRANSACTION_COMPLETE,
	BINDER_STAT_COUNT
};

struct binder_stats {
	int br[_IOC_NR(BR_FAILED_REPLY) + 1];
	int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
	int obj_created[BINDER_STAT_COUNT];
	int obj_deleted[BINDER_STAT_COUNT];
};

static struct binder_stats binder_stats;

static inline void binder_stats_deleted(enum binder_stat_types type)
{
	binder_stats.obj_deleted[type]++;
}

static inline void binder_stats_created(enum binder_stat_types type)
{
	binder_stats.obj_created[type]++;
}

struct binder_transaction_log_entry {
	int debug_id;
	int call_type;
	int from_proc;
	int from_thread;
	int target_handle;
	int to_proc;
	int to_thread;
	int to_node;
	int data_size;
	int offsets_size;
};
struct binder_transaction_log {
	int next;
	int full;
	struct binder_transaction_log_entry entry[32];
};
static struct binder_transaction_log binder_transaction_log;
static struct binder_transaction_log binder_transaction_log_failed;

static struct binder_transaction_log_entry *binder_transaction_log_add(
	struct binder_transaction_log *log)
{
	struct binder_transaction_log_entry *e;

	e = &log->entry[log->next];
	memset(e, 0, sizeof(*e));
	log->next++;
	if (log->next == ARRAY_SIZE(log->entry)) {
		log->next = 0;
		log->full = 1;
	}
	return e;
}

struct binder_work {
	struct list_head entry;
	enum {
		BINDER_WORK_TRANSACTION = 1,
		BINDER_WORK_TRANSACTION_COMPLETE,
		BINDER_WORK_NODE,
		BINDER_WORK_DEAD_BINDER,
		BINDER_WORK_DEAD_BINDER_AND_CLEAR,
		BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
	} type;
};

struct binder_node {
	int debug_id;
	struct binder_work work;
	union {
		struct rb_node rb_node;
		struct hlist_node dead_node;
	};
	struct binder_proc *proc;
	struct hlist_head refs;
	int internal_strong_refs;
	int local_weak_refs;
	int local_strong_refs;
	binder_uintptr_t ptr;
	binder_uintptr_t cookie;
	unsigned has_strong_ref:1;
	unsigned pending_strong_ref:1;
	unsigned has_weak_ref:1;
	unsigned pending_weak_ref:1;
	unsigned has_async_transaction:1;
	unsigned accept_fds:1;
	unsigned min_priority:8;
	struct list_head async_todo;
};

struct binder_ref_death {
	struct binder_work work;
	binder_uintptr_t cookie;
};

struct binder_ref {
	/* Lookups needed: */
	/*   node + proc => ref (transaction) */
	/*   desc + proc => ref (transaction, inc/dec ref) */
	/*   node => refs + procs (proc exit) */
	int debug_id;
	struct rb_node rb_node_desc;
	struct rb_node rb_node_node;
	struct hlist_node node_entry;
	struct binder_proc *proc;
	struct binder_node *node;
	uint32_t desc;
	int strong;
	int weak;
	struct binder_ref_death *death;
};

struct binder_buffer {
	struct list_head entry; /* free and allocated entries by address */
	struct rb_node rb_node; /* free entry by size or allocated entry */
				/* by address */
	unsigned free:1;
	unsigned allow_user_free:1;
	unsigned async_transaction:1;
	unsigned debug_id:29;

	struct binder_transaction *transaction;

	struct binder_node *target_node;
	size_t data_size;
	size_t offsets_size;
	uint8_t data[0];
};

enum binder_deferred_state {
	BINDER_DEFERRED_PUT_FILES    = 0x01,
	BINDER_DEFERRED_FLUSH        = 0x02,
	BINDER_DEFERRED_RELEASE      = 0x04,
};

struct binder_proc {
	struct hlist_node proc_node;
	struct rb_root threads;
	struct rb_root nodes;
	struct rb_root refs_by_desc;
	struct rb_root refs_by_node;
	int pid;
	struct vm_area_struct *vma;
	struct mm_struct *vma_vm_mm;
	struct task_struct *tsk;
	struct files_struct *files;
	struct hlist_node deferred_work_node;
	int deferred_work;
	void *buffer;
	ptrdiff_t user_buffer_offset;

	struct list_head buffers;
	struct rb_root free_buffers;
	struct rb_root allocated_buffers;
	size_t free_async_space;

	struct page **pages;
	size_t buffer_size;
	uint32_t buffer_free;
	struct list_head todo;
	wait_queue_head_t wait;
	struct binder_stats stats;
	struct list_head delivered_death;
	int max_threads;
	int requested_threads;
	int requested_threads_started;
	int ready_threads;
	long default_priority;
	struct dentry *debugfs_entry;
};

enum {
	BINDER_LOOPER_STATE_REGISTERED  = 0x01,
	BINDER_LOOPER_STATE_ENTERED     = 0x02,
	BINDER_LOOPER_STATE_EXITED      = 0x04,
	BINDER_LOOPER_STATE_INVALID     = 0x08,
	BINDER_LOOPER_STATE_WAITING     = 0x10,
	BINDER_LOOPER_STATE_NEED_RETURN = 0x20
};

struct binder_thread {
	struct binder_proc *proc;
	struct rb_node rb_node;
	int pid;
	int looper;
	struct binder_transaction *transaction_stack;
	struct list_head todo;
	uint32_t return_error; /* Write failed, return error code in read buf */
	uint32_t return_error2; /* Write failed, return error code in read */
		/* buffer. Used when sending a reply to a dead process that */
		/* we are also waiting on */
	wait_queue_head_t wait;
	struct binder_stats stats;
};

struct binder_transaction {
	int debug_id;
	struct binder_work work;
	struct binder_thread *from;
	struct binder_transaction *from_parent;
	struct binder_proc *to_proc;
	struct binder_thread *to_thread;
	struct binder_transaction *to_parent;
	unsigned need_reply:1;
	/* unsigned is_dead:1; */	/* not used at the moment */

	struct binder_buffer *buffer;
	unsigned int	code;
	unsigned int	flags;
	long	priority;
	long	saved_priority;
	kuid_t	sender_euid;
};

static void
binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);

static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
{
	struct files_struct *files = proc->files;
	unsigned long rlim_cur;
	unsigned long irqs;

	if (files == NULL)
		return -ESRCH;

	if (!lock_task_sighand(proc->tsk, &irqs))
		return -EMFILE;

	rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
	unlock_task_sighand(proc->tsk, &irqs);

	return __alloc_fd(files, 0, rlim_cur, flags);
}

/*
 * copied from fd_install
 */
static void task_fd_install(
	struct binder_proc *proc, unsigned int fd, struct file *file)
{
	if (proc->files)
		__fd_install(proc->files, fd, file);
}

/*
 * copied from sys_close
 */
static long task_close_fd(struct binder_proc *proc, unsigned int fd)
{
	int retval;

	if (proc->files == NULL)
		return -ESRCH;

	retval = __close_fd(proc->files, fd);
	/* can't restart close syscall because file table entry was cleared */
	if (unlikely(retval == -ERESTARTSYS ||
		     retval == -ERESTARTNOINTR ||
		     retval == -ERESTARTNOHAND ||
		     retval == -ERESTART_RESTARTBLOCK))
		retval = -EINTR;

	return retval;
}

static inline void binder_lock(const char *tag)
{
	trace_binder_lock(tag);
	mutex_lock(&binder_main_lock);
	trace_binder_locked(tag);
}

static inline void binder_unlock(const char *tag)
{
	trace_binder_unlock(tag);
	mutex_unlock(&binder_main_lock);
}

static void binder_set_nice(long nice)
{
	long min_nice;

	if (can_nice(current, nice)) {
		set_user_nice(current, nice);
		return;
	}
	min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
	binder_debug(BINDER_DEBUG_PRIORITY_CAP,
		     "%d: nice value %ld not allowed use %ld instead\n",
		      current->pid, nice, min_nice);
	set_user_nice(current, min_nice);
	if (min_nice <= MAX_NICE)
		return;
	binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
}

static size_t binder_buffer_size(struct binder_proc *proc,
				 struct binder_buffer *buffer)
{
	if (list_is_last(&buffer->entry, &proc->buffers))
		return proc->buffer + proc->buffer_size - (void *)buffer->data;
	return (size_t)list_entry(buffer->entry.next,
			  struct binder_buffer, entry) - (size_t)buffer->data;
}

static void binder_insert_free_buffer(struct binder_proc *proc,
				      struct binder_buffer *new_buffer)
{
	struct rb_node **p = &proc->free_buffers.rb_node;
	struct rb_node *parent = NULL;
	struct binder_buffer *buffer;
	size_t buffer_size;
	size_t new_buffer_size;

	BUG_ON(!new_buffer->free);

	new_buffer_size = binder_buffer_size(proc, new_buffer);

	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
		     "%d: add free buffer, size %zd, at %p\n",
		      proc->pid, new_buffer_size, new_buffer);

	while (*p) {
		parent = *p;
		buffer = rb_entry(parent, struct binder_buffer, rb_node);
		BUG_ON(!buffer->free);

		buffer_size = binder_buffer_size(proc, buffer);

		if (new_buffer_size < buffer_size)
			p = &parent->rb_left;
		else
			p = &parent->rb_right;
	}
	rb_link_node(&new_buffer->rb_node, parent, p);
	rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
}

static void binder_insert_allocated_buffer(struct binder_proc *proc,
					   struct binder_buffer *new_buffer)
{
	struct rb_node **p = &proc->allocated_buffers.rb_node;
	struct rb_node *parent = NULL;
	struct binder_buffer *buffer;

	BUG_ON(new_buffer->free);

	while (*p) {
		parent = *p;
		buffer = rb_entry(parent, struct binder_buffer, rb_node);
		BUG_ON(buffer->free);

		if (new_buffer < buffer)
			p = &parent->rb_left;
		else if (new_buffer > buffer)
			p = &parent->rb_right;
		else
			BUG();
	}
	rb_link_node(&new_buffer->rb_node, parent, p);
	rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
}

static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
						  uintptr_t user_ptr)
{
	struct rb_node *n = proc->allocated_buffers.rb_node;
	struct binder_buffer *buffer;
	struct binder_buffer *kern_ptr;

	kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
		- offsetof(struct binder_buffer, data));

	while (n) {
		buffer = rb_entry(n, struct binder_buffer, rb_node);
		BUG_ON(buffer->free);

		if (kern_ptr < buffer)
			n = n->rb_left;
		else if (kern_ptr > buffer)
			n = n->rb_right;
		else
			return buffer;
	}
	return NULL;
}

static int binder_update_page_range(struct binder_proc *proc, int allocate,
				    void *start, void *end,
				    struct vm_area_struct *vma)
{
	void *page_addr;
	unsigned long user_page_addr;
	struct vm_struct tmp_area;
	struct page **page;
	struct mm_struct *mm;

	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
		     "%d: %s pages %p-%p\n", proc->pid,
		     allocate ? "allocate" : "free", start, end);

	if (end <= start)
		return 0;

	trace_binder_update_page_range(proc, allocate, start, end);

	if (vma)
		mm = NULL;
	else
		mm = get_task_mm(proc->tsk);

	if (mm) {
		down_write(&mm->mmap_sem);
		vma = proc->vma;
		if (vma && mm != proc->vma_vm_mm) {
			pr_err("%d: vma mm and task mm mismatch\n",
				proc->pid);
			vma = NULL;
		}
	}

	if (allocate == 0)
		goto free_range;

	if (vma == NULL) {
		pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
			proc->pid);
		goto err_no_vma;
	}

	for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
		int ret;

		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];

		BUG_ON(*page);
		*page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
		if (*page == NULL) {
			pr_err("%d: binder_alloc_buf failed for page at %p\n",
				proc->pid, page_addr);
			goto err_alloc_page_failed;
		}
		tmp_area.addr = page_addr;
		tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
		ret = map_vm_area(&tmp_area, PAGE_KERNEL, page);
		if (ret) {
			pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
			       proc->pid, page_addr);
			goto err_map_kernel_failed;
		}
		user_page_addr =
			(uintptr_t)page_addr + proc->user_buffer_offset;
		ret = vm_insert_page(vma, user_page_addr, page[0]);
		if (ret) {
			pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
			       proc->pid, user_page_addr);
			goto err_vm_insert_page_failed;
		}
		/* vm_insert_page does not seem to increment the refcount */
	}
	if (mm) {
		up_write(&mm->mmap_sem);
		mmput(mm);
	}
	return 0;

free_range:
	for (page_addr = end - PAGE_SIZE; page_addr >= start;
	     page_addr -= PAGE_SIZE) {
		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
		if (vma)
			zap_page_range(vma, (uintptr_t)page_addr +
				proc->user_buffer_offset, PAGE_SIZE, NULL);
err_vm_insert_page_failed:
		unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
err_map_kernel_failed:
		__free_page(*page);
		*page = NULL;
err_alloc_page_failed:
		;
	}
err_no_vma:
	if (mm) {
		up_write(&mm->mmap_sem);
		mmput(mm);
	}
	return -ENOMEM;
}

static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
					      size_t data_size,
					      size_t offsets_size, int is_async)
{
	struct rb_node *n = proc->free_buffers.rb_node;
	struct binder_buffer *buffer;
	size_t buffer_size;
	struct rb_node *best_fit = NULL;
	void *has_page_addr;
	void *end_page_addr;
	size_t size;

	if (proc->vma == NULL) {
		pr_err("%d: binder_alloc_buf, no vma\n",
		       proc->pid);
		return NULL;
	}

	size = ALIGN(data_size, sizeof(void *)) +
		ALIGN(offsets_size, sizeof(void *));

	if (size < data_size || size < offsets_size) {
		binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
				proc->pid, data_size, offsets_size);
		return NULL;
	}

	if (is_async &&
	    proc->free_async_space < size + sizeof(struct binder_buffer)) {
		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
			     "%d: binder_alloc_buf size %zd failed, no async space left\n",
			      proc->pid, size);
		return NULL;
	}

	while (n) {
		buffer = rb_entry(n, struct binder_buffer, rb_node);
		BUG_ON(!buffer->free);
		buffer_size = binder_buffer_size(proc, buffer);

		if (size < buffer_size) {
			best_fit = n;
			n = n->rb_left;
		} else if (size > buffer_size)
			n = n->rb_right;
		else {
			best_fit = n;
			break;
		}
	}
	if (best_fit == NULL) {
		pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
			proc->pid, size);
		return NULL;
	}
	if (n == NULL) {
		buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
		buffer_size = binder_buffer_size(proc, buffer);
	}

	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
		     "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
		      proc->pid, size, buffer, buffer_size);

	has_page_addr =
		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
	if (n == NULL) {
		if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
			buffer_size = size; /* no room for other buffers */
		else
			buffer_size = size + sizeof(struct binder_buffer);
	}
	end_page_addr =
		(void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
	if (end_page_addr > has_page_addr)
		end_page_addr = has_page_addr;
	if (binder_update_page_range(proc, 1,
	    (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
		return NULL;

	rb_erase(best_fit, &proc->free_buffers);
	buffer->free = 0;
	binder_insert_allocated_buffer(proc, buffer);
	if (buffer_size != size) {
		struct binder_buffer *new_buffer = (void *)buffer->data + size;

		list_add(&new_buffer->entry, &buffer->entry);
		new_buffer->free = 1;
		binder_insert_free_buffer(proc, new_buffer);
	}
	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
		     "%d: binder_alloc_buf size %zd got %p\n",
		      proc->pid, size, buffer);
	buffer->data_size = data_size;
	buffer->offsets_size = offsets_size;
	buffer->async_transaction = is_async;
	if (is_async) {
		proc->free_async_space -= size + sizeof(struct binder_buffer);
		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
			     "%d: binder_alloc_buf size %zd async free %zd\n",
			      proc->pid, size, proc->free_async_space);
	}

	return buffer;
}

static void *buffer_start_page(struct binder_buffer *buffer)
{
	return (void *)((uintptr_t)buffer & PAGE_MASK);
}

static void *buffer_end_page(struct binder_buffer *buffer)
{
	return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
}

static void binder_delete_free_buffer(struct binder_proc *proc,
				      struct binder_buffer *buffer)
{
	struct binder_buffer *prev, *next = NULL;
	int free_page_end = 1;
	int free_page_start = 1;

	BUG_ON(proc->buffers.next == &buffer->entry);
	prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
	BUG_ON(!prev->free);
	if (buffer_end_page(prev) == buffer_start_page(buffer)) {
		free_page_start = 0;
		if (buffer_end_page(prev) == buffer_end_page(buffer))
			free_page_end = 0;
		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
			     "%d: merge free, buffer %p share page with %p\n",
			      proc->pid, buffer, prev);
	}

	if (!list_is_last(&buffer->entry, &proc->buffers)) {
		next = list_entry(buffer->entry.next,
				  struct binder_buffer, entry);
		if (buffer_start_page(next) == buffer_end_page(buffer)) {
			free_page_end = 0;
			if (buffer_start_page(next) ==
			    buffer_start_page(buffer))
				free_page_start = 0;
			binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
				     "%d: merge free, buffer %p share page with %p\n",
				      proc->pid, buffer, prev);
		}
	}
	list_del(&buffer->entry);
	if (free_page_start || free_page_end) {
		binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
			     "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
			     proc->pid, buffer, free_page_start ? "" : " end",
			     free_page_end ? "" : " start", prev, next);
		binder_update_page_range(proc, 0, free_page_start ?
			buffer_start_page(buffer) : buffer_end_page(buffer),
			(free_page_end ? buffer_end_page(buffer) :
			buffer_start_page(buffer)) + PAGE_SIZE, NULL);
	}
}

static void binder_free_buf(struct binder_proc *proc,
			    struct binder_buffer *buffer)
{
	size_t size, buffer_size;

	buffer_size = binder_buffer_size(proc, buffer);

	size = ALIGN(buffer->data_size, sizeof(void *)) +
		ALIGN(buffer->offsets_size, sizeof(void *));

	binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
		     "%d: binder_free_buf %p size %zd buffer_size %zd\n",
		      proc->pid, buffer, size, buffer_size);

	BUG_ON(buffer->free);
	BUG_ON(size > buffer_size);
	BUG_ON(buffer->transaction != NULL);
	BUG_ON((void *)buffer < proc->buffer);
	BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);

	if (buffer->async_transaction) {
		proc->free_async_space += size + sizeof(struct binder_buffer);

		binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
			     "%d: binder_free_buf size %zd async free %zd\n",
			      proc->pid, size, proc->free_async_space);
	}

	binder_update_page_range(proc, 0,
		(void *)PAGE_ALIGN((uintptr_t)buffer->data),
		(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
		NULL);
	rb_erase(&buffer->rb_node, &proc->allocated_buffers);
	buffer->free = 1;
	if (!list_is_last(&buffer->entry, &proc->buffers)) {
		struct binder_buffer *next = list_entry(buffer->entry.next,
						struct binder_buffer, entry);

		if (next->free) {
			rb_erase(&next->rb_node, &proc->free_buffers);
			binder_delete_free_buffer(proc, next);
		}
	}
	if (proc->buffers.next != &buffer->entry) {
		struct binder_buffer *prev = list_entry(buffer->entry.prev,
						struct binder_buffer, entry);

		if (prev->free) {
			binder_delete_free_buffer(proc, buffer);
			rb_erase(&prev->rb_node, &proc->free_buffers);
			buffer = prev;
		}
	}
	binder_insert_free_buffer(proc, buffer);
}

static struct binder_node *binder_get_node(struct binder_proc *proc,
					   binder_uintptr_t ptr)
{
	struct rb_node *n = proc->nodes.rb_node;
	struct binder_node *node;

	while (n) {
		node = rb_entry(n, struct binder_node, rb_node);

		if (ptr < node->ptr)
			n = n->rb_left;
		else if (ptr > node->ptr)
			n = n->rb_right;
		else
			return node;
	}
	return NULL;
}

static struct binder_node *binder_new_node(struct binder_proc *proc,
					   binder_uintptr_t ptr,
					   binder_uintptr_t cookie)
{
	struct rb_node **p = &proc->nodes.rb_node;
	struct rb_node *parent = NULL;
	struct binder_node *node;

	while (*p) {
		parent = *p;
		node = rb_entry(parent, struct binder_node, rb_node);

		if (ptr < node->ptr)
			p = &(*p)->rb_left;
		else if (ptr > node->ptr)
			p = &(*p)->rb_right;
		else
			return NULL;
	}

	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (node == NULL)
		return NULL;
	binder_stats_created(BINDER_STAT_NODE);
	rb_link_node(&node->rb_node, parent, p);
	rb_insert_color(&node->rb_node, &proc->nodes);
	node->debug_id = ++binder_last_id;
	node->proc = proc;
	node->ptr = ptr;
	node->cookie = cookie;
	node->work.type = BINDER_WORK_NODE;
	INIT_LIST_HEAD(&node->work.entry);
	INIT_LIST_HEAD(&node->async_todo);
	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
		     "%d:%d node %d u%016llx c%016llx created\n",
		     proc->pid, current->pid, node->debug_id,
		     (u64)node->ptr, (u64)node->cookie);
	return node;
}

static int binder_inc_node(struct binder_node *node, int strong, int internal,
			   struct list_head *target_list)
{
	if (strong) {
		if (internal) {
			if (target_list == NULL &&
			    node->internal_strong_refs == 0 &&
			    !(node == binder_context_mgr_node &&
			    node->has_strong_ref)) {
				pr_err("invalid inc strong node for %d\n",
					node->debug_id);
				return -EINVAL;
			}
			node->internal_strong_refs++;
		} else
			node->local_strong_refs++;
		if (!node->has_strong_ref && target_list) {
			list_del_init(&node->work.entry);
			list_add_tail(&node->work.entry, target_list);
		}
	} else {
		if (!internal)
			node->local_weak_refs++;
		if (!node->has_weak_ref && list_empty(&node->work.entry)) {
			if (target_list == NULL) {
				pr_err("invalid inc weak node for %d\n",
					node->debug_id);
				return -EINVAL;
			}
			list_add_tail(&node->work.entry, target_list);
		}
	}
	return 0;
}

static int binder_dec_node(struct binder_node *node, int strong, int internal)
{
	if (strong) {
		if (internal)
			node->internal_strong_refs--;
		else
			node->local_strong_refs--;
		if (node->local_strong_refs || node->internal_strong_refs)
			return 0;
	} else {
		if (!internal)
			node->local_weak_refs--;
		if (node->local_weak_refs || !hlist_empty(&node->refs))
			return 0;
	}
	if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
		if (list_empty(&node->work.entry)) {
			list_add_tail(&node->work.entry, &node->proc->todo);
			wake_up_interruptible(&node->proc->wait);
		}
	} else {
		if (hlist_empty(&node->refs) && !node->local_strong_refs &&
		    !node->local_weak_refs) {
			list_del_init(&node->work.entry);
			if (node->proc) {
				rb_erase(&node->rb_node, &node->proc->nodes);
				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
					     "refless node %d deleted\n",
					     node->debug_id);
			} else {
				hlist_del(&node->dead_node);
				binder_debug(BINDER_DEBUG_INTERNAL_REFS,
					     "dead node %d deleted\n",
					     node->debug_id);
			}
			kfree(node);
			binder_stats_deleted(BINDER_STAT_NODE);
		}
	}

	return 0;
}


static struct binder_ref *binder_get_ref(struct binder_proc *proc,
					 uint32_t desc)
{
	struct rb_node *n = proc->refs_by_desc.rb_node;
	struct binder_ref *ref;

	while (n) {
		ref = rb_entry(n, struct binder_ref, rb_node_desc);

		if (desc < ref->desc)
			n = n->rb_left;
		else if (desc > ref->desc)
			n = n->rb_right;
		else
			return ref;
	}
	return NULL;
}

static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
						  struct binder_node *node)
{
	struct rb_node *n;
	struct rb_node **p = &proc->refs_by_node.rb_node;
	struct rb_node *parent = NULL;
	struct binder_ref *ref, *new_ref;

	while (*p) {
		parent = *p;
		ref = rb_entry(parent, struct binder_ref, rb_node_node);

		if (node < ref->node)
			p = &(*p)->rb_left;
		else if (node > ref->node)
			p = &(*p)->rb_right;
		else
			return ref;
	}
	new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
	if (new_ref == NULL)
		return NULL;
	binder_stats_created(BINDER_STAT_REF);
	new_ref->debug_id = ++binder_last_id;
	new_ref->proc = proc;
	new_ref->node = node;
	rb_link_node(&new_ref->rb_node_node, parent, p);
	rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);

	new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
	for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
		ref = rb_entry(n, struct binder_ref, rb_node_desc);
		if (ref->desc > new_ref->desc)
			break;
		new_ref->desc = ref->desc + 1;
	}

	p = &proc->refs_by_desc.rb_node;
	while (*p) {
		parent = *p;
		ref = rb_entry(parent, struct binder_ref, rb_node_desc);

		if (new_ref->desc < ref->desc)
			p = &(*p)->rb_left;
		else if (new_ref->desc > ref->desc)
			p = &(*p)->rb_right;
		else
			BUG();
	}
	rb_link_node(&new_ref->rb_node_desc, parent, p);
	rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
	if (node) {
		hlist_add_head(&new_ref->node_entry, &node->refs);

		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
			     "%d new ref %d desc %d for node %d\n",
			      proc->pid, new_ref->debug_id, new_ref->desc,
			      node->debug_id);
	} else {
		binder_debug(BINDER_DEBUG_INTERNAL_REFS,
			     "%d new ref %d desc %d for dead node\n",
			      proc->pid, new_ref->debug_id, new_ref->desc);
	}
	return new_ref;
}

static void binder_delete_ref(struct binder_ref *ref)
{
	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
		     "%d delete ref %d desc %d for node %d\n",
		      ref->proc->pid, ref->debug_id, ref->desc,
		      ref->node->debug_id);

	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
	if (ref->strong)
		binder_dec_node(ref->node, 1, 1);
	hlist_del(&ref->node_entry);
	binder_dec_node(ref->node, 0, 1);
	if (ref->death) {
		binder_debug(BINDER_DEBUG_DEAD_BINDER,
			     "%d delete ref %d desc %d has death notification\n",
			      ref->proc->pid, ref->debug_id, ref->desc);
		list_del(&ref->death->work.entry);
		kfree(ref->death);
		binder_stats_deleted(BINDER_STAT_DEATH);
	}
	kfree(ref);
	binder_stats_deleted(BINDER_STAT_REF);
}

static int binder_inc_ref(struct binder_ref *ref, int strong,
			  struct list_head *target_list)
{
	int ret;

	if (strong) {
		if (ref->strong == 0) {
			ret = binder_inc_node(ref->node, 1, 1, target_list);
			if (ret)
				return ret;
		}
		ref->strong++;
	} else {
		if (ref->weak == 0) {
			ret = binder_inc_node(ref->node, 0, 1, target_list);
			if (ret)
				return ret;
		}
		ref->weak++;
	}
	return 0;
}


static int binder_dec_ref(struct binder_ref *ref, int strong)
{
	if (strong) {
		if (ref->strong == 0) {
			binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
					  ref->proc->pid, ref->debug_id,
					  ref->desc, ref->strong, ref->weak);
			return -EINVAL;
		}
		ref->strong--;
		if (ref->strong == 0) {
			int ret;

			ret = binder_dec_node(ref->node, strong, 1);
			if (ret)
				return ret;
		}
	} else {
		if (ref->weak == 0) {
			binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
					  ref->proc->pid, ref->debug_id,
					  ref->desc, ref->strong, ref->weak);
			return -EINVAL;
		}
		ref->weak--;
	}
	if (ref->strong == 0 && ref->weak == 0)
		binder_delete_ref(ref);
	return 0;
}

static void binder_pop_transaction(struct binder_thread *target_thread,
				   struct binder_transaction *t)
{
	if (target_thread) {
		BUG_ON(target_thread->transaction_stack != t);
		BUG_ON(target_thread->transaction_stack->from != target_thread);
		target_thread->transaction_stack =
			target_thread->transaction_stack->from_parent;
		t->from = NULL;
	}
	t->need_reply = 0;
	if (t->buffer)
		t->buffer->transaction = NULL;
	kfree(t);
	binder_stats_deleted(BINDER_STAT_TRANSACTION);
}

static void binder_send_failed_reply(struct binder_transaction *t,
				     uint32_t error_code)
{
	struct binder_thread *target_thread;
	struct binder_transaction *next;

	BUG_ON(t->flags & TF_ONE_WAY);
	while (1) {
		target_thread = t->from;
		if (target_thread) {
			if (target_thread->return_error != BR_OK &&
			   target_thread->return_error2 == BR_OK) {
				target_thread->return_error2 =
					target_thread->return_error;
				target_thread->return_error = BR_OK;
			}
			if (target_thread->return_error == BR_OK) {
				binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
					     "send failed reply for transaction %d to %d:%d\n",
					      t->debug_id,
					      target_thread->proc->pid,
					      target_thread->pid);

				binder_pop_transaction(target_thread, t);
				target_thread->return_error = error_code;
				wake_up_interruptible(&target_thread->wait);
			} else {
				pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
					target_thread->proc->pid,
					target_thread->pid,
					target_thread->return_error);
			}
			return;
		}
		next = t->from_parent;

		binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
			     "send failed reply for transaction %d, target dead\n",
			     t->debug_id);

		binder_pop_transaction(target_thread, t);
		if (next == NULL) {
			binder_debug(BINDER_DEBUG_DEAD_BINDER,
				     "reply failed, no target thread at root\n");
			return;
		}
		t = next;
		binder_debug(BINDER_DEBUG_DEAD_BINDER,
			     "reply failed, no target thread -- retry %d\n",
			      t->debug_id);
	}
}

static void binder_transaction_buffer_release(struct binder_proc *proc,
					      struct binder_buffer *buffer,
					      binder_size_t *failed_at)
{
	binder_size_t *offp, *off_end;
	int debug_id = buffer->debug_id;

	binder_debug(BINDER_DEBUG_TRANSACTION,
		     "%d buffer release %d, size %zd-%zd, failed at %p\n",
		     proc->pid, buffer->debug_id,
		     buffer->data_size, buffer->offsets_size, failed_at);

	if (buffer->target_node)
		binder_dec_node(buffer->target_node, 1, 0);

	offp = (binder_size_t *)(buffer->data +
				 ALIGN(buffer->data_size, sizeof(void *)));
	if (failed_at)
		off_end = failed_at;
	else
		off_end = (void *)offp + buffer->offsets_size;
	for (; offp < off_end; offp++) {
		struct flat_binder_object *fp;

		if (*offp > buffer->data_size - sizeof(*fp) ||
		    buffer->data_size < sizeof(*fp) ||
		    !IS_ALIGNED(*offp, sizeof(u32))) {
			pr_err("transaction release %d bad offset %lld, size %zd\n",
			       debug_id, (u64)*offp, buffer->data_size);
			continue;
		}
		fp = (struct flat_binder_object *)(buffer->data + *offp);
		switch (fp->type) {
		case BINDER_TYPE_BINDER:
		case BINDER_TYPE_WEAK_BINDER: {
			struct binder_node *node = binder_get_node(proc, fp->binder);

			if (node == NULL) {
				pr_err("transaction release %d bad node %016llx\n",
				       debug_id, (u64)fp->binder);
				break;
			}
			binder_debug(BINDER_DEBUG_TRANSACTION,
				     "        node %d u%016llx\n",
				     node->debug_id, (u64)node->ptr);
			binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
		} break;
		case BINDER_TYPE_HANDLE:
		case BINDER_TYPE_WEAK_HANDLE: {
			struct binder_ref *ref = binder_get_ref(proc, fp->handle);

			if (ref == NULL) {
				pr_err("transaction release %d bad handle %d\n",
				 debug_id, fp->handle);
				break;
			}
			binder_debug(BINDER_DEBUG_TRANSACTION,
				     "        ref %d desc %d (node %d)\n",
				     ref->debug_id, ref->desc, ref->node->debug_id);
			binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
		} break;

		case BINDER_TYPE_FD:
			binder_debug(BINDER_DEBUG_TRANSACTION,
				     "        fd %d\n", fp->handle);
			if (failed_at)
				task_close_fd(proc, fp->handle);
			break;

		default:
			pr_err("transaction release %d bad object type %x\n",
				debug_id, fp->type);
			break;
		}
	}
}

static void binder_transaction(struct binder_proc *proc,
			       struct binder_thread *thread,
			       struct binder_transaction_data *tr, int reply)
{
	struct binder_transaction *t;
	struct binder_work *tcomplete;
	binder_size_t *offp, *off_end;
	struct binder_proc *target_proc;
	struct binder_thread *target_thread = NULL;
	struct binder_node *target_node = NULL;
	struct list_head *target_list;
	wait_queue_head_t *target_wait;
	struct binder_transaction *in_reply_to = NULL;
	struct binder_transaction_log_entry *e;
	uint32_t return_error;

	e = binder_transaction_log_add(&binder_transaction_log);
	e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
	e->from_proc = proc->pid;
	e->from_thread = thread->pid;
	e->target_handle = tr->target.handle;
	e->data_size = tr->data_size;
	e->offsets_size = tr->offsets_size;

	if (reply) {
		in_reply_to = thread->transaction_stack;
		if (in_reply_to == NULL) {
			binder_user_error("%d:%d got reply transaction with no transaction stack\n",
					  proc->pid, thread->pid);
			return_error = BR_FAILED_REPLY;
			goto err_empty_call_stack;
		}
		binder_set_nice(in_reply_to->saved_priority);
		if (in_reply_to->to_thread != thread) {
			binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
				proc->pid, thread->pid, in_reply_to->debug_id,
				in_reply_to->to_proc ?
				in_reply_to->to_proc->pid : 0,
				in_reply_to->to_thread ?
				in_reply_to->to_thread->pid : 0);
			return_error = BR_FAILED_REPLY;
			in_reply_to = NULL;
			goto err_bad_call_stack;
		}
		thread->transaction_stack = in_reply_to->to_parent;
		target_thread = in_reply_to->from;
		if (target_thread == NULL) {
			return_error = BR_DEAD_REPLY;
			goto err_dead_binder;
		}
		if (target_thread->transaction_stack != in_reply_to) {
			binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
				proc->pid, thread->pid,
				target_thread->transaction_stack ?
				target_thread->transaction_stack->debug_id : 0,
				in_reply_to->debug_id);
			return_error = BR_FAILED_REPLY;
			in_reply_to = NULL;
			target_thread = NULL;
			goto err_dead_binder;
		}
		target_proc = target_thread->proc;
	} else {
		if (tr->target.handle) {
			struct binder_ref *ref;

			ref = binder_get_ref(proc, tr->target.handle);
			if (ref == NULL) {
				binder_user_error("%d:%d got transaction to invalid handle\n",
					proc->pid, thread->pid);
				return_error = BR_FAILED_REPLY;
				goto err_invalid_target_handle;
			}
			target_node = ref->node;
		} else {
			target_node = binder_context_mgr_node;
			if (target_node == NULL) {
				return_error = BR_DEAD_REPLY;
				goto err_no_context_mgr_node;
			}
		}
		e->to_node = target_node->debug_id;
		target_proc = target_node->proc;
		if (target_proc == NULL) {
			return_error = BR_DEAD_REPLY;
			goto err_dead_binder;
		}
		if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
			struct binder_transaction *tmp;

			tmp = thread->transaction_stack;
			if (tmp->to_thread != thread) {
				binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
					proc->pid, thread->pid, tmp->debug_id,
					tmp->to_proc ? tmp->to_proc->pid : 0,
					tmp->to_thread ?
					tmp->to_thread->pid : 0);
				return_error = BR_FAILED_REPLY;
				goto err_bad_call_stack;
			}
			while (tmp) {
				if (tmp->from && tmp->from->proc == target_proc)
					target_thread = tmp->from;
				tmp = tmp->from_parent;
			}
		}
	}
	if (target_thread) {
		e->to_thread = target_thread->pid;
		target_list = &target_thread->todo;
		target_wait = &target_thread->wait;
	} else {
		target_list = &target_proc->todo;
		target_wait = &target_proc->wait;
	}
	e->to_proc = target_proc->pid;

	/* TODO: reuse incoming transaction for reply */
	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (t == NULL) {
		return_error = BR_FAILED_REPLY;
		goto err_alloc_t_failed;
	}
	binder_stats_created(BINDER_STAT_TRANSACTION);

	tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
	if (tcomplete == NULL) {
		return_error = BR_FAILED_REPLY;
		goto err_alloc_tcomplete_failed;
	}
	binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);

	t->debug_id = ++binder_last_id;
	e->debug_id = t->debug_id;

	if (reply)
		binder_debug(BINDER_DEBUG_TRANSACTION,
			     "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld\n",
			     proc->pid, thread->pid, t->debug_id,
			     target_proc->pid, target_thread->pid,
			     (u64)tr->data.ptr.buffer,
			     (u64)tr->data.ptr.offsets,
			     (u64)tr->data_size, (u64)tr->offsets_size);
	else
		binder_debug(BINDER_DEBUG_TRANSACTION,
			     "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld\n",
			     proc->pid, thread->pid, t->debug_id,
			     target_proc->pid, target_node->debug_id,
			     (u64)tr->data.ptr.buffer,
			     (u64)tr->data.ptr.offsets,
			     (u64)tr->data_size, (u64)tr->offsets_size);

	if (!reply && !(tr->flags & TF_ONE_WAY))
		t->from = thread;
	else
		t->from = NULL;
	t->sender_euid = task_euid(proc->tsk);
	t->to_proc = target_proc;
	t->to_thread = target_thread;
	t->code = tr->code;
	t->flags = tr->flags;
	t->priority = task_nice(current);

	trace_binder_transaction(reply, t, target_node);

	t->buffer = binder_alloc_buf(target_proc, tr->data_size,
		tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
	if (t->buffer == NULL) {
		return_error = BR_FAILED_REPLY;
		goto err_binder_alloc_buf_failed;
	}
	t->buffer->allow_user_free = 0;
	t->buffer->debug_id = t->debug_id;
	t->buffer->transaction = t;
	t->buffer->target_node = target_node;
	trace_binder_transaction_alloc_buf(t->buffer);
	if (target_node)
		binder_inc_node(target_node, 1, 0, NULL);

	offp = (binder_size_t *)(t->buffer->data +
				 ALIGN(tr->data_size, sizeof(void *)));

	if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
			   tr->data.ptr.buffer, tr->data_size)) {
		binder_user_error("%d:%d got transaction with invalid data ptr\n",
				proc->pid, thread->pid);
		return_error = BR_FAILED_REPLY;
		goto err_copy_data_failed;
	}
	if (copy_from_user(offp, (const void __user *)(uintptr_t)
			   tr->data.ptr.offsets, tr->offsets_size)) {
		binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
				proc->pid, thread->pid);
		return_error = BR_FAILED_REPLY;
		goto err_copy_data_failed;
	}
	if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
		binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
				proc->pid, thread->pid, (u64)tr->offsets_size);
		return_error = BR_FAILED_REPLY;
		goto err_bad_offset;
	}
	off_end = (void *)offp + tr->offsets_size;
	for (; offp < off_end; offp++) {
		struct flat_binder_object *fp;

		if (*offp > t->buffer->data_size - sizeof(*fp) ||
		    t->buffer->data_size < sizeof(*fp) ||
		    !IS_ALIGNED(*offp, sizeof(u32))) {
			binder_user_error("%d:%d got transaction with invalid offset, %lld\n",
					  proc->pid, thread->pid, (u64)*offp);
			return_error = BR_FAILED_REPLY;
			goto err_bad_offset;
		}
		fp = (struct flat_binder_object *)(t->buffer->data + *offp);
		switch (fp->type) {
		case BINDER_TYPE_BINDER:
		case BINDER_TYPE_WEAK_BINDER: {
			struct binder_ref *ref;
			struct binder_node *node = binder_get_node(proc, fp->binder);

			if (node == NULL) {
				node = binder_new_node(proc, fp->binder, fp->cookie);
				if (node == NULL) {
					return_error = BR_FAILED_REPLY;
					goto err_binder_new_node_failed;
				}
				node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
				node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
			}
			if (fp->cookie != node->cookie) {
				binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
					proc->pid, thread->pid,
					(u64)fp->binder, node->debug_id,
					(u64)fp->cookie, (u64)node->cookie);
				return_error = BR_FAILED_REPLY;
				goto err_binder_get_ref_for_node_failed;
			}
			ref = binder_get_ref_for_node(target_proc, node);
			if (ref == NULL) {
				return_error = BR_FAILED_REPLY;
				goto err_binder_get_ref_for_node_failed;
			}
			if (fp->type == BINDER_TYPE_BINDER)
				fp->type = BINDER_TYPE_HANDLE;
			else
				fp->type = BINDER_TYPE_WEAK_HANDLE;
			fp->handle = ref->desc;
			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
				       &thread->todo);

			trace_binder_transaction_node_to_ref(t, node, ref);
			binder_debug(BINDER_DEBUG_TRANSACTION,
				     "        node %d u%016llx -> ref %d desc %d\n",
				     node->debug_id, (u64)node->ptr,
				     ref->debug_id, ref->desc);
		} break;
		case BINDER_TYPE_HANDLE:
		case BINDER_TYPE_WEAK_HANDLE: {
			struct binder_ref *ref = binder_get_ref(proc, fp->handle);

			if (ref == NULL) {
				binder_user_error("%d:%d got transaction with invalid handle, %d\n",
						proc->pid,
						thread->pid, fp->handle);
				return_error = BR_FAILED_REPLY;
				goto err_binder_get_ref_failed;
			}
			if (ref->node->proc == target_proc) {
				if (fp->type == BINDER_TYPE_HANDLE)
					fp->type = BINDER_TYPE_BINDER;
				else
					fp->type = BINDER_TYPE_WEAK_BINDER;
				fp->binder = ref->node->ptr;
				fp->cookie = ref->node->cookie;
				binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
				trace_binder_transaction_ref_to_node(t, ref);
				binder_debug(BINDER_DEBUG_TRANSACTION,
					     "        ref %d desc %d -> node %d u%016llx\n",
					     ref->debug_id, ref->desc, ref->node->debug_id,
					     (u64)ref->node->ptr);
			} else {
				struct binder_ref *new_ref;

				new_ref = binder_get_ref_for_node(target_proc, ref->node);
				if (new_ref == NULL) {
					return_error = BR_FAILED_REPLY;
					goto err_binder_get_ref_for_node_failed;
				}
				fp->handle = new_ref->desc;
				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
				trace_binder_transaction_ref_to_ref(t, ref,
								    new_ref);
				binder_debug(BINDER_DEBUG_TRANSACTION,
					     "        ref %d desc %d -> ref %d desc %d (node %d)\n",
					     ref->debug_id, ref->desc, new_ref->debug_id,
					     new_ref->desc, ref->node->debug_id);
			}
		} break;

		case BINDER_TYPE_FD: {
			int target_fd;
			struct file *file;

			if (reply) {
				if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
					binder_user_error("%d:%d got reply with fd, %d, but target does not allow fds\n",
						proc->pid, thread->pid, fp->handle);
					return_error = BR_FAILED_REPLY;
					goto err_fd_not_allowed;
				}
			} else if (!target_node->accept_fds) {
				binder_user_error("%d:%d got transaction with fd, %d, but target does not allow fds\n",
					proc->pid, thread->pid, fp->handle);
				return_error = BR_FAILED_REPLY;
				goto err_fd_not_allowed;
			}

			file = fget(fp->handle);
			if (file == NULL) {
				binder_user_error("%d:%d got transaction with invalid fd, %d\n",
					proc->pid, thread->pid, fp->handle);
				return_error = BR_FAILED_REPLY;
				goto err_fget_failed;
			}
			target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
			if (target_fd < 0) {
				fput(file);
				return_error = BR_FAILED_REPLY;
				goto err_get_unused_fd_failed;
			}
			task_fd_install(target_proc, target_fd, file);
			trace_binder_transaction_fd(t, fp->handle, target_fd);
			binder_debug(BINDER_DEBUG_TRANSACTION,
				     "        fd %d -> %d\n", fp->handle, target_fd);
			/* TODO: fput? */
			fp->handle = target_fd;
		} break;

		default:
			binder_user_error("%d:%d got transaction with invalid object type, %x\n",
				proc->pid, thread->pid, fp->type);
			return_error = BR_FAILED_REPLY;
			goto err_bad_object_type;
		}
	}
	if (reply) {
		BUG_ON(t->buffer->async_transaction != 0);
		binder_pop_transaction(target_thread, in_reply_to);
	} else if (!(t->flags & TF_ONE_WAY)) {
		BUG_ON(t->buffer->async_transaction != 0);
		t->need_reply = 1;
		t->from_parent = thread->transaction_stack;
		thread->transaction_stack = t;
	} else {
		BUG_ON(target_node == NULL);
		BUG_ON(t->buffer->async_transaction != 1);
		if (target_node->has_async_transaction) {
			target_list = &target_node->async_todo;
			target_wait = NULL;
		} else
			target_node->has_async_transaction = 1;
	}
	t->work.type = BINDER_WORK_TRANSACTION;
	list_add_tail(&t->work.entry, target_list);
	tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
	list_add_tail(&tcomplete->entry, &thread->todo);
	if (target_wait)
		wake_up_interruptible(target_wait);
	return;

err_get_unused_fd_failed:
err_fget_failed:
err_fd_not_allowed:
err_binder_get_ref_for_node_failed:
err_binder_get_ref_failed:
err_binder_new_node_failed:
err_bad_object_type:
err_bad_offset:
err_copy_data_failed:
	trace_binder_transaction_failed_buffer_release(t->buffer);
	binder_transaction_buffer_release(target_proc, t->buffer, offp);
	t->buffer->transaction = NULL;
	binder_free_buf(target_proc, t->buffer);
err_binder_alloc_buf_failed:
	kfree(tcomplete);
	binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
err_alloc_tcomplete_failed:
	kfree(t);
	binder_stats_deleted(BINDER_STAT_TRANSACTION);
err_alloc_t_failed:
err_bad_call_stack:
err_empty_call_stack:
err_dead_binder:
err_invalid_target_handle:
err_no_context_mgr_node:
	binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
		     "%d:%d transaction failed %d, size %lld-%lld\n",
		     proc->pid, thread->pid, return_error,
		     (u64)tr->data_size, (u64)tr->offsets_size);

	{
		struct binder_transaction_log_entry *fe;

		fe = binder_transaction_log_add(&binder_transaction_log_failed);
		*fe = *e;
	}

	BUG_ON(thread->return_error != BR_OK);
	if (in_reply_to) {
		thread->return_error = BR_TRANSACTION_COMPLETE;
		binder_send_failed_reply(in_reply_to, return_error);
	} else
		thread->return_error = return_error;
}

static int binder_thread_write(struct binder_proc *proc,
			struct binder_thread *thread,
			binder_uintptr_t binder_buffer, size_t size,
			binder_size_t *consumed)
{
	uint32_t cmd;
	void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
	void __user *ptr = buffer + *consumed;
	void __user *end = buffer + size;

	while (ptr < end && thread->return_error == BR_OK) {
		if (get_user(cmd, (uint32_t __user *)ptr))
			return -EFAULT;
		ptr += sizeof(uint32_t);
		trace_binder_command(cmd);
		if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
			binder_stats.bc[_IOC_NR(cmd)]++;
			proc->stats.bc[_IOC_NR(cmd)]++;
			thread->stats.bc[_IOC_NR(cmd)]++;
		}
		switch (cmd) {
		case BC_INCREFS:
		case BC_ACQUIRE:
		case BC_RELEASE:
		case BC_DECREFS: {
			uint32_t target;
			struct binder_ref *ref;
			const char *debug_string;

			if (get_user(target, (uint32_t __user *)ptr))
				return -EFAULT;
			ptr += sizeof(uint32_t);
			if (target == 0 && binder_context_mgr_node &&
			    (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
				ref = binder_get_ref_for_node(proc,
					       binder_context_mgr_node);
				if (ref->desc != target) {
					binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
						proc->pid, thread->pid,
						ref->desc);
				}
			} else
				ref = binder_get_ref(proc, target);
			if (ref == NULL) {
				binder_user_error("%d:%d refcount change on invalid ref %d\n",
					proc->pid, thread->pid, target);
				break;
			}
			switch (cmd) {
			case BC_INCREFS:
				debug_string = "IncRefs";
				binder_inc_ref(ref, 0, NULL);
				break;
			case BC_ACQUIRE:
				debug_string = "Acquire";
				binder_inc_ref(ref, 1, NULL);
				break;
			case BC_RELEASE:
				debug_string = "Release";
				binder_dec_ref(ref, 1);
				break;
			case BC_DECREFS:
			default: