linux-kernel - Re: [PATCH v3] can, tty: elmcan CAN/ldisc driver for ELM327 based OBD-II adapters

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Message-ID: <20220317220822.4595c89f.max@enpas.org>
Date:   Thu, 17 Mar 2022 22:08:22 +0100
From:   Max Staudt <max@...as.org>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Vincent Mailhol <vincent.mailhol@...il.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH v3] can, tty: elmcan CAN/ldisc driver for ELM327 based
 OBD-II adapters

On Thu, 17 Mar 2022 21:57:17 +0100
Marc Kleine-Budde <mkl@...gutronix.de> wrote:

> On 17.03.2022 21:23:59, Max Staudt wrote:
> > On Mon, 14 Mar 2022 23:04:08 +0100
> > Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> >   
> > > On 09.03.2022 22:49:49, Vincent Mailhol wrote:  
> > > > Either we agree that using can_rx_offload without implementing
> > > > the mailbox_read() is OK and in that case, the can_rx_offload
> > > > framework should be modified to allow mailbox_read() to be a
> > > > NULL pointer.
> > > > 
> > > > Either it is not the case and you use the more classic
> > > > netif_rx().
> > > > 
> > > > And I do not have the answer. I haven't studied can_rx_offload
> > > > enough to be a judge here. Sorry.
> > > > 
> > > > @Marc, any thoughts?    
> > > 
> > > Use can_rx_offload_add_manual() instead.  
> > 
> > m-(
> > 
> > Yes, it's right underneath _add_fifo() and does the right thing. No
> > idea how I missed it, I thought I had looked through all variants.  
> 
> I think that function was not there form the beginning, maybe you
> looked at the rx-offload code when it was not available.

Indeed, it was added in 5.10, and my rx-offload work likely just about
missed that. Thanks!


Max