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Subject[PATCH 37/37] binder: remove global binder lock
Date
Remove global mutex and rely on fine-grained locking

Signed-off-by: Todd Kjos <tkjos@google.com>
---
drivers/android/binder.c | 46 +++-------------------------------------------
1 file changed, 3 insertions(+), 43 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1e50b034d49a..c8e9d5dfcd86 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -80,8 +80,6 @@
#include "binder_alloc.h"
#include "binder_trace.h"

-static DEFINE_MUTEX(binder_main_lock);
-
static HLIST_HEAD(binder_deferred_list);
static DEFINE_MUTEX(binder_deferred_lock);

@@ -924,19 +922,6 @@ static long task_close_fd(struct binder_proc *proc, unsigned int fd)
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;
@@ -3557,8 +3542,6 @@ static int binder_thread_read(struct binder_proc *proc,

thread->looper |= BINDER_LOOPER_STATE_WAITING;

- binder_unlock(__func__);
-
trace_binder_wait_for_work(wait_for_proc_work,
!!thread->transaction_stack,
!binder_worklist_empty(proc, &thread->todo));
@@ -3584,8 +3567,6 @@ static int binder_thread_read(struct binder_proc *proc,
ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
}

- binder_lock(__func__);
-
binder_inner_proc_lock(proc);
if (wait_for_proc_work)
proc->ready_threads--;
@@ -4101,8 +4082,6 @@ static unsigned int binder_poll(struct file *filp,
struct binder_thread *thread = NULL;
int wait_for_proc_work;

- binder_lock(__func__);
-
thread = binder_get_thread(proc);

binder_inner_proc_lock(thread->proc);
@@ -4110,8 +4089,6 @@ static unsigned int binder_poll(struct file *filp,
binder_worklist_empty_ilocked(&thread->todo);
binder_inner_proc_unlock(thread->proc);

- binder_unlock(__func__);
-
if (wait_for_proc_work) {
if (binder_has_proc_work(proc, thread))
return POLLIN;
@@ -4256,7 +4233,6 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (ret)
goto err_unlocked;

- binder_lock(__func__);
thread = binder_get_thread(proc);
if (thread == NULL) {
ret = -ENOMEM;
@@ -4315,7 +4291,6 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
err:
if (thread)
thread->looper_need_return = false;
- binder_unlock(__func__);
wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
if (ret && ret != -ERESTARTSYS)
pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
@@ -4421,15 +4396,11 @@ static int binder_open(struct inode *nodp, struct file *filp)
proc->context = &binder_dev->context;
binder_alloc_init(&proc->alloc);

- binder_lock(__func__);
-
binder_stats_created(BINDER_STAT_PROC);
proc->pid = current->group_leader->pid;
INIT_LIST_HEAD(&proc->delivered_death);
filp->private_data = proc;

- binder_unlock(__func__);
-
mutex_lock(&binder_procs_lock);
hlist_add_head(&proc->proc_node, &binder_procs);
mutex_unlock(&binder_procs_lock);
@@ -4655,7 +4626,6 @@ static void binder_deferred_func(struct work_struct *work)
int defer;

do {
- binder_lock(__func__);
mutex_lock(&binder_deferred_lock);
if (!hlist_empty(&binder_deferred_list)) {
proc = hlist_entry(binder_deferred_list.first,
@@ -4682,7 +4652,6 @@ static void binder_deferred_func(struct work_struct *work)
if (defer & BINDER_DEFERRED_RELEASE)
binder_deferred_release(proc); /* frees proc */

- binder_unlock(__func__);
if (files)
put_files_struct(files);
} while (proc);
@@ -5097,8 +5066,6 @@ static int binder_state_show(struct seq_file *m, void *unused)
struct binder_node *node;
struct binder_node *last_node = NULL;

- binder_lock(__func__);
-
seq_puts(m, "binder state:\n");

spin_lock(&binder_dead_nodes_lock);
@@ -5128,7 +5095,7 @@ static int binder_state_show(struct seq_file *m, void *unused)
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc(m, proc, 1);
mutex_unlock(&binder_procs_lock);
- binder_unlock(__func__);
+
return 0;
}

@@ -5136,8 +5103,6 @@ static int binder_stats_show(struct seq_file *m, void *unused)
{
struct binder_proc *proc;

- binder_lock(__func__);
-
seq_puts(m, "binder stats:\n");

print_binder_stats(m, "", &binder_stats);
@@ -5146,7 +5111,7 @@ static int binder_stats_show(struct seq_file *m, void *unused)
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc_stats(m, proc);
mutex_unlock(&binder_procs_lock);
- binder_unlock(__func__);
+
return 0;
}

@@ -5154,14 +5119,12 @@ static int binder_transactions_show(struct seq_file *m, void *unused)
{
struct binder_proc *proc;

- binder_lock(__func__);
-
seq_puts(m, "binder transactions:\n");
mutex_lock(&binder_procs_lock);
hlist_for_each_entry(proc, &binder_procs, proc_node)
print_binder_proc(m, proc, 0);
mutex_unlock(&binder_procs_lock);
- binder_unlock(__func__);
+
return 0;
}

@@ -5170,8 +5133,6 @@ static int binder_proc_show(struct seq_file *m, void *unused)
struct binder_proc *itr;
int pid = (unsigned long)m->private;

- binder_lock(__func__);
-
mutex_lock(&binder_procs_lock);
hlist_for_each_entry(itr, &binder_procs, proc_node) {
if (itr->pid == pid) {
@@ -5181,7 +5142,6 @@ static int binder_proc_show(struct seq_file *m, void *unused)
}
mutex_unlock(&binder_procs_lock);

- binder_unlock(__func__);
return 0;
}

--
2.13.2.725.g09c95d1e9-goog
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