FROMLIST: binder: make binder_last_id an atomic
(from https://patchwork.kernel.org/patch/9817809/)
Use an atomic for binder_last_id to avoid locking it
Change-Id: I582c48be4bd04a17d6c96c9a4093c3ade56c47cd
Signed-off-by: Todd Kjos <tkjos@google.com>
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index a8e56a4..970c21d 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -58,7 +58,7 @@
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) \
@@ -495,7 +495,7 @@
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 @@
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 @@
}
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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