On Fri, 6 Sep 2019, Dan Elkouby wrote:

hidp_send_message was changed to return non-zero values on success,
which some other bits did not expect. This caused spurious errors to be
propagated through the stack, breaking some drivers, such as hid-sony
for the Dualshock 4 in Bluetooth mode.

As pointed out by Dan Carpenter, hid-microsoft directly relied on that
assumption as well.

Fixes: 48d9cc9d85dd ("Bluetooth: hidp: Let hidp_send_message return number of queued bytes")

Signed-off-by: Dan Elkouby <redacted>

Reviewed-by: Jiri Kosina <redacted>

Marcel, are you taking this through your tree?

Thanks,

-- 
Jiri Kosina
SUSE Labs