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binder: make binder_last_id an atomic 

Use an atomic for binder_last_id to avoid locking it

Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2017-06-29 12:01:45 -07:00 committed by Greg Kroah-Hartman
parent 0953c7976c
commit 656a800aad
1 changed files with 4 additions and 4 deletions
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8
drivers/android/binder.c
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@ -59,7 +59,7 @@ static DEFINE_SPINLOCK(binder_dead_nodes_lock);
static struct dentry *binder_debugfs_dir_entry_root;
static struct dentry *binder_debugfs_dir_entry_proc;
static int binder_last_id;
static atomic_t binder_last_id;
#define BINDER_DEBUG_ENTRY(name) \
static int binder_##name##_open(struct inode *inode, struct file *file) \
@ -496,7 +496,7 @@ static struct binder_node *binder_new_node(struct binder_proc *proc,
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->debug_id = atomic_inc_return(&binder_last_id);
node->proc = proc;
node->ptr = ptr;
node->cookie = cookie;
@ -639,7 +639,7 @@ static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
if (new_ref == NULL)
return NULL;
binder_stats_created(BINDER_STAT_REF);
new_ref->debug_id = ++binder_last_id;
new_ref->debug_id = atomic_inc_return(&binder_last_id);
new_ref->proc = proc;
new_ref->node = node;
rb_link_node(&new_ref->rb_node_node, parent, p);
@ -1527,7 +1527,7 @@ static void binder_transaction(struct binder_proc *proc,
}
binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
t->debug_id = ++binder_last_id;
t->debug_id = atomic_inc_return(&binder_last_id);
e->debug_id = t->debug_id;
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