linux-kernel - Re: [PATCH] tty: serial: men_z135_uart: Fix driver for changes in hardware

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Date:	Tue, 9 Sep 2014 17:26:35 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Johannes Thumshirn <johannes.thumshirn@....de>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: serial: men_z135_uart: Fix driver for changes in
 hardware

On Tue, Sep 09, 2014 at 07:56:15AM +0200, Johannes Thumshirn wrote:
> On Mon, Sep 08, 2014 at 04:17:33PM -0700, Greg Kroah-Hartman wrote:
> > >
> > > @@ -118,6 +117,10 @@ static int align;
> > >  module_param(align, int, S_IRUGO);
> > >  MODULE_PARM_DESC(align, "Keep hardware FIFO write pointer aligned, default 0");
> > >
> > > +static int rx_timeout;
> > > +module_param(rx_timeout, uint, S_IRUGO);
> > > +MODULE_PARM_DESC(rx_timeout, "RX timeout");
> >
> > Why add a module parameter?  Who will know to set this?  And to what
> > value?
> >
> 
> There will be a user manual describing the parameter. It's like the rxlvl and
> txlvl parameters, you'll have to read the manual if you need other values than
> the default ones.

Ugh, but module parameters are for all devices in the system of this
type, which is why we try not to have them at all anymore.

And I don't like the other module parameters either :(

But it's an odd-one-off driver, I guess we can live...

> > And what about this driver working on old hardware, didn't you just
> > break this?
> >
> 
> No. Currently the hardware is in a testing stage at only one customer and it is
> an IP-Core inside a FPGA, so it can be (and already is) updated. So we can be
> save to assume this is O.K.

Ok, can you please resend this, it's gone from my queue now.

greg k-h
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