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binderfs: add new binder devices to binder_devices

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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@google.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20241218212935.4162907-2-dualli@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Li 2024-12-18 13:29:34 -08:00 • committed by Greg Kroah-Hartman
parent b3b9b3cccb
commit 12d909cac1
3 changed files with 16 additions and 2 deletions
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5
drivers/android/binder.c
View file

@ -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;

11
drivers/android/binder_internal.h
View file

@ -25,8 +25,7 @@ struct binder_context {
/**
* struct binder_device - information about a binder device node
* @hlist: list of binder devices (only used for devices requested via
* CONFIG_ANDROID_BINDER_DEVICES)
* @hlist: list of binder devices
* @miscdev: information about a binder character device node
* @context: binder context information
* @binderfs_inode: This is the inode of the root dentry of the super block
@ -582,4 +581,12 @@ 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 */

2
drivers/android/binderfs.c
View file

@ -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: