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

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Message-ID: <20190815180637.GA20006@roeck-us.net>
Date:   Thu, 15 Aug 2019 11:06:37 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v5 05/18] watchdog: cpwd: use generic compat_ptr_ioctl

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>