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Mavroudis Chatzilazaridis 37b36e0765 HID: logitech-hidpp: Do not assume FAP in hidpp_send_message_sync()
[ Upstream commit aba7963544 ]

Currently, hidpp_send_message_sync() retries sending the message when the
device returns a busy error code, specifically HIDPP20_ERROR_BUSY, which
has a different meaning under RAP. This ends up being a problem because
this function is used for both FAP and RAP messages.

This issue is not noticeable on older receivers with unreachable devices
since they return HIDPP_ERROR_RESOURCE_ERROR (0x09), which is not equal to
HIDPP20_ERROR_BUSY (0x08).

However, newer receivers return HIDPP_ERROR_UNKNOWN_DEVICE (0x08) which
happens to equal to HIDPP20_ERROR_BUSY, causing unnecessary retries when
the device is not actually busy.

This is resolved by checking if the error response is FAP or RAP and
picking the respective ERROR_BUSY code.

Fixes: 60165ab774 ("HID: logitech-hidpp: rework one more time the retries attempts")
Signed-off-by: Mavroudis Chatzilazaridis <mavchatz@protonmail.com>
Tested-by: Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-12-18 13:59:15 +01:00
..
2023-10-25 18:33:42 +02:00
2024-09-27 08:18:43 -07:00
2025-08-12 14:56:35 +02:00