linux-kernel - Re: [PATCH V1 0/3] Add notifier call chain to Embedded USB Debug(EUD) driver

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Date:   Thu, 13 Jul 2023 15:52:58 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Bjorn Andersson <andersson@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH V1 0/3] Add notifier call chain to Embedded USB
 Debug(EUD) driver

On Thu, Jul 13, 2023 at 01:55:34PM +0530, Souradeep Chowdhury wrote:
> 
> 
> On 7/12/2023 10:10 PM, Greg KH wrote:
> > On Wed, Jul 12, 2023 at 01:52:37PM +0530, Souradeep Chowdhury wrote:
> > > This patch series adds the notifier chain to the Embedded USB Debug(EUD) driver.
> > > The notifier chain is used to check the role switch status of EUD. Since EUD can
> > > function only in device mode, other modules trying to do role-switch on the same
> > > port have to first check the EUD status by calling this notifier chain and based
> > > on the status proceed or block their role-switching step. The modules can call
> > > the notifier through the call eud_notifier_call_chain and pass their own
> > > role switch state as the argument. This chain will also be able to handle the
> > > scenario of multiple modules switching roles on the same port since this can
> > > create a priority and ordering among them for conflict resolution.
> > 
> > You are adding a new api that no one is actually using, so why would we
> > accept this at all?
> > 
> > And how can we actually review it without any real users?
> 
> Ack. The next version of this will be posted along with the usage
> of these apis for ordering the role-switch.

Also note that I hate notifier call chains, so you better have a very
good reason for why they are required and can't be done in any other
normal way instead :)

good luck!

greg k-h