linux-kernel - Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr

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Date:   Tue, 8 Oct 2019 09:38:33 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>
Subject: Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

On Tue, Oct 8, 2019 at 1:30 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Wed, Aug 14, 2019 at 10:42:32PM +0200, Arnd Bergmann wrote:
> > The cpwd_compat_ioctl() contains a bogus mutex that dates
> > back to a leftover BKL instance.
> >
> > Simplify the implementation by using the new compat_ptr_ioctl()
> > helper function that will do the right thing for all calls
> > here.
> >
> > Note that WIOCSTART/WIOCSTOP don't take any arguments, so
> > the compat_ptr() conversion is not needed here, but it also
> > doesn't hurt.
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > Reviewed-by: Guenter Roeck <linux@...ck-us.net>
>
> This patch made it into the kernel, but the infrastructure didn't make it.
> Do we need to revert it ?

Sorry I had not realized that this patch got queued in the watchdog tree
and relied on the other patches. I ended up not sending the series after
a runtime regression in another driver, combined with the series not
having spent much time in linux-next before the merge window.

I've sent a fixup patch now that will make it do the right thing
regardless of my series, please apply that for v5.4.

        Arnd