linux-kernel - Re: [PATCH v8 0/2] gpiolib: don't allow user-space to crash the kernel with hot-unplugs

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Message-ID: <Y43rmRW1S8PvMJW4@smile.fi.intel.com>
Date:   Mon, 5 Dec 2022 15:01:13 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nick Hainke <vincent@...temli.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v8 0/2] gpiolib: don't allow user-space to crash the
 kernel with hot-unplugs

On Mon, Dec 05, 2022 at 02:59:42PM +0200, Andy Shevchenko wrote:
> On Mon, Dec 05, 2022 at 01:39:01PM +0100, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > 
> > Linus Torvalds pointed out that using trylock here is wrong. This iteration
> > drops it in favor of unconditional locks but keeps all the fixes that came
> > later.
> > 
> > I will also not send it for this release but make it part of the updates PR
> > for v6.2 to give it some time in next.
> > 
> > v7 -> v8:
> > - don't use down_read_trylock(), just go straight for a full lock
> 
> Yep, it was a good wrap-up explanation.

But he also suggested to fold NULL check into call_*_locked(). Any points why
you decided not to go that way?

-- 
With Best Regards,
Andy Shevchenko