linux-kernel - Re: [PATCH] watchdog: Remove iop

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Date:   Wed, 20 Nov 2019 16:36:30 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>, Laura Abbott <labbott@...hat.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        Lennert Buytenhek <kernel@...tstofly.org>
Subject: Re: [PATCH] watchdog: Remove iop_wdt

On Wed, Nov 20, 2019 at 11:56:52PM +0000, Russell King - ARM Linux admin wrote:
> On Wed, Nov 20, 2019 at 03:05:18PM -0800, Guenter Roeck wrote:
> > On Wed, Nov 20, 2019 at 10:30:54AM +0000, Russell King - ARM Linux admin wrote:
> > > On Wed, Nov 20, 2019 at 11:15:01AM +0100, Arnd Bergmann wrote:
> > > > On Wed, Nov 20, 2019 at 11:03 AM Russell King - ARM Linux admin
> > > > <linux@...linux.org.uk> wrote:
> > > > > On Tue, Nov 19, 2019 at 06:29:09AM -0800, Guenter Roeck wrote:
> > > > > > On 11/19/19 1:40 AM, Arnd Bergmann wrote:
> > > > > > > On Tue, Nov 19, 2019 at 3:08 AM Guenter Roeck <linux@...ck-us.net> wrote:
> > > > > > > > On 11/18/19 2:04 PM, Laura Abbott wrote:
> > > > > >
> > > > > > Good point, especially since apparently no one cared for five years.
> > > > >
> > > > > Doesn't mean that there aren't interested parties.  I still have
> > > > > IOP32x hardware running here in the form of a N2100 (my firewall)
> > > > > and it seems that I never noticed this option disappearing until
> > > > > now...
> > > > 
> > > > It's not that it was ever there for IOP32x: the driver was introduced in 2007
> > > > and was available for IOP32x but failed to compile for it until 2014 when
> > > > I sent the patch to disable the driver in all configurations that
> > > > failed to build.
> > > 
> > > Well:
> > > 
> > > systems/n2100/boot/config-3.11.5+:CONFIG_IOP_WATCHDOG=m
> > > systems/n2100/boot/config-3.12.6+:CONFIG_IOP_WATCHDOG=m
> > > systems/n2100/boot/config-3.9.5+:CONFIG_IOP_WATCHDOG=m
> > > 
> > > -rw-rw-r-- 1 rmk rmk 5284 Dec 30  2013 systems/n2100/lib/modules/3.12.6+/kernel/drivers/watchdog/iop_wdt.ko
> > > -rw-rw-r-- 1 rmk rmk 5276 Dec 20  2013 systems/n2100/lib/modules/3.9.5+/kernel/drivers/watchdog/iop_wdt.ko
> > > 
> > > It seems I've been carrying a patch to comment out the troublesome code:
> > > 
> > > -       write_wdtsr(IOP13XX_WDTCR_IB_RESET);
> > > +//     write_wdtsr(IOP13XX_WDTCR_IB_RESET);
> > > 
> > > in my stable tree since 2015.
> > 
> > Do you have plans to update that kernel to mainline ?
> > If yes, a patch to make the driver (and I guess everything else that broke
> > since 3.12) work would be helpful.
> 
> It's a currently running 4.19.xx stable kernel, but as a result of the
> patch to the Kconfig file, without the watchdog which I hadn't realised
> until I saw this thread.  Is that mainline enough?
> 
Yes. Can you send me a patch with the above fix and the necessary Kconfig
change ?

Thanks,
Guenter