[PATCH] input synaptics-rmi4: stop scanning PDT after blank page

[Christopher Heiny <cheiny@synaptics.com>]

When scanning the Page Descriptor Table, the end of the PDT is marked by a
page where the first PDT entry is empty.  Stop scanning when we find this
page.

Signed-off-by: Christopher Heiny <cheiny@synaptics.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Linux Walleij <linus.walleij@linaro.org>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>

---
 drivers/input/rmi4/rmi_driver.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index 2172c80..dd3ccf5 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -505,7 +505,8 @@ static int rmi_scan_pdt_page(struct rmi_device *rmi_dev,
 			return retval;
 	}
 
-	return data->f01_bootloader_mode ? RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
+	return (data->f01_bootloader_mode || addr == pdt_start) ?
+					RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
 }
 
 static int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx,