[PATCH 01/18] HID: logitech-hidpp: fix G920 force-feedback initialization timeout

[Dmitry Torokhov]

Commit 544315e40172 ("HID: logitech-hidpp: move FF initialization to
.input_configured()") moved Logitech G920 force-feedback querying and
initialization into hidpp_input_configured(), which runs during
hid_connect(). Because hidpp_probe() calls hid_device_io_stop() across
hid_connect(), incoming HID++ responses from the device are blocked
and g920_get_config() times out with -ETIMEDOUT.

Temporarily re-enable HID device I/O around g920_get_config() in
hidpp_input_configured() so the hardware configuration queries receive
their replies during input setup.

Fixes: 544315e40172 ("HID: logitech-hidpp: move FF initialization to .input_configured()")
Reported-by: Gideon Heinz <gideonheinz02@xxxxxxxxx>
Closes: https://lore.kernel.org/r/CAPb1+K1-pirdLGZ1wTUw26G6pvhg7rGP3QZ172ys5DB7rNCf5w@xxxxxxxxxxxxxx
Tested-by: Gideon Heinz <gideonheinz02@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
 drivers/hid/hid-logitech-hidpp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 9646380febac..6b1f55483385 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -4098,7 +4098,9 @@ static int hidpp_input_configured(struct hid_device *hdev, struct hid_input *hid
 		if (!list_is_first(&hidinput->list, &hdev->inputs))
 			return 0;
 
+		hid_device_io_start(hdev);
 		ret = g920_get_config(hidpp, &data);
+		hid_device_io_stop(hdev);
 		if (!ret)
 			ret = hidpp_ff_init(hidpp, &data);
 
-- 
2.56.0.506.g506a7eabc5-goog