linux-kernel - Re: [PATCH] watchdog: imx2

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Date:   Mon, 24 Feb 2020 10:30:33 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Anson Huang <anson.huang@....com>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] watchdog: imx2_wdt: Drop .remove callback

On Mon, Feb 24, 2020 at 07:25:22PM +0100, Uwe Kleine-König wrote:
> On Mon, Feb 24, 2020 at 06:15:17AM -0800, Guenter Roeck wrote:
> > How would you expect the watchdog core to stop the watchdog
> > with no stop function in the driver ?
> 
> I'm not 100% sure, but I think the situation is that you cannot stop the
> watchdog in the watchdog register range, but if you stop the clock it
> will never expire.
> 
> That's why I asked if the devm action callback stops the watchdog.
> 

Again, it should not be possible to unload the driver if the watchdog
is running.

Guenter