Re: [PATCH bpf-next v7 15/24] HID: bpf: allocate data memory for device_event BPF programs

On Thu, Jul 21, 2022 at 05:36:16PM +0200, Benjamin Tissoires wrote:

We need to also be able to change the size of the report. Reducing it is easy, because we already have the incoming buffer that is big enough, but extending it is harder.

Pre-allocate a buffer that is big enough to handle all reports of the device, and use that as the primary buffer for BPF programs. To be able to change the size of the buffer, we change the device_event API and request it to return the size of the buffer.

Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org