[PATCH net-next v10 1/2] binderfs: add new binder devices to binder_devices

[Li Li]

From: Li Li <dualli@xxxxxxxxxx>

When binderfs is not enabled, the binder driver parses the kernel
config to create all binder devices. All of the new binder devices
are stored in the list binder_devices.

When binderfs is enabled, the binder driver creates new binder devices
dynamically when userspace applications call BINDER_CTL_ADD ioctl. But
the devices created in this way are not stored in the same list.

This patch fixes that.

Signed-off-by: Li Li <dualli@xxxxxxxxxx>
---
 drivers/android/binder.c          | 5 +++++
 drivers/android/binder_internal.h | 8 ++++++++
 drivers/android/binderfs.c        | 2 ++
 3 files changed, 15 insertions(+)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index ef353ca13c35..0a16acd29653 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -6928,6 +6928,11 @@ const struct binder_debugfs_entry binder_debugfs_entries[] = {
 	{} /* terminator */
 };
 
+void binder_add_device(struct binder_device *device)
+{
+	hlist_add_head(&device->hlist, &binder_devices);
+}
+
 static int __init init_binder_device(const char *name)
 {
 	int ret;
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index f8d6be682f23..1f21ad3963b1 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -582,4 +582,12 @@ struct binder_object {
 	};
 };
 
+/**
+ * Add a binder device to binder_devices
+ * @device: the new binder device to add to the global list
+ *
+ * Not reentrant as the list is not protected by any locks
+ */
+void binder_add_device(struct binder_device *device);
+
 #endif /* _LINUX_BINDER_INTERNAL_H */
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index ad1fa7abc323..bc6bae76ccaf 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -207,6 +207,8 @@ static int binderfs_binder_device_create(struct inode *ref_inode,
 	fsnotify_create(root->d_inode, dentry);
 	inode_unlock(d_inode(root));
 
+	binder_add_device(device);
+
 	return 0;
 
 err:
-- 
2.47.1.613.gc27f4b7a9f-goog