linux-kernel - Re: [PATCH bpf-next v2 07/28] bpf/hid: add a new attach type to change the report descriptor

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Date:   Fri, 4 Mar 2022 19:32:26 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 07/28] bpf/hid: add a new attach type to
 change the report descriptor

On Fri, Mar 04, 2022 at 06:28:31PM +0100, Benjamin Tissoires wrote:
> The report descriptor is the dictionary of the HID protocol specific
> to the given device.
> Changing it is a common habit in the HID world, and making that feature
> accessible from eBPF allows to fix devices without having to install a
> new kernel.
> 
> However, the report descriptor is supposed to be static on a device.
> To be able to change it, we need to reconnect the device at the HID
> level.
> So whenever the report descriptor program type is attached or detached,
> we call on a hook on HID to notify it that there is something to be
> done.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>