serdev: only match serdev devices

Only serdev devices (a.k.a. clients or slaves) are bound to drivers so
bail out early from match() in case the device is not a serdev device
(i.e. if it's a serdev controller).

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index c8c43834477b..f710862f5c06 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -63,6 +63,11 @@ static const struct device_type serdev_device_type = {
         .release        = serdev_device_release,
 };
 
+static bool is_serdev_device(const struct device *dev)
+{
+        return dev->type == &serdev_device_type;
+}
+
 static void serdev_ctrl_release(struct device *dev)
 {
         struct serdev_controller *ctrl = to_serdev_controller(dev);
@@ -76,6 +81,9 @@ static const struct device_type serdev_ctrl_type = {
 
 static int serdev_device_match(struct device *dev, struct device_driver *drv)
 {
+        if (!is_serdev_device(dev))
+                return 0;
+
         /* TODO: platform matching */
         if (acpi_driver_match_device(dev, drv))
                 return 1;