Re: [PATCH 4.19 19/57] Bluetooth: hidp: Let hidp_send_message return number of queued bytes

Hi!

[ Upstream commit 48d9cc9d85dde37c87abb7ac9bbec6598ba44b56 ]

Let hidp_send_message return the number of successfully queued bytes instead of an unconditional 0.

With the return value fixed to 0, other drivers relying on hidp, such as hidraw, can not return meaningful values from their respective implementations of write(). In particular, with the current behavior, a hidraw device's write() will have different return values depending on whether the device is connected via USB or Bluetooth, which makes it harder to abstract away the transport layer.

So, does this change any actual behaviour?

Is it fixing a bug, or is it just preparation for a patch that is not going to make it to stable? Pavel