linux-kernel - Re: [PATCH v2 3/5] HID: dualsense_remove: manually unregister leds

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Message-ID: <CAEih1qUU_aaHk7xFuyocgUq0pYLHemuRQiTboZDwyBTd7u2L5g@mail.gmail.com>
Date:   Thu, 9 Feb 2023 13:50:57 +0100
From:   Pietro Borrello <borrello@...g.uniroma1.it>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Hanno Zulla <kontakt@...no.de>,
        Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Roderick Colenbrander <roderick.colenbrander@...y.com>,
        Sven Eckelmann <sven@...fation.org>,
        linux-leds@...r.kernel.org,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jkl820.git@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Kosina <jkosina@...e.cz>,
        Roderick Colenbrander <roderick@...kai.com>
Subject: Re: [PATCH v2 3/5] HID: dualsense_remove: manually unregister leds

On Thu, 9 Feb 2023 at 09:59, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
>
> On Jan 31 2023, Pietro Borrello wrote:
> > Unregister the LED controllers before device removal, to prevent
> > unnecessary runs of dualsense_player_led_set_brightness().
> >
> > Fixes: 8c0ab553b072 ("HID: playstation: expose DualSense player LEDs through LED class.")
> > Signed-off-by: Pietro Borrello <borrello@...g.uniroma1.it>
> >
> > ---
> >
> > Contrary to the other patches in this series, failing to unregister
> > the led controller does not results into a use-after-free thanks
> > to the output_worker_initialized variable and the spinlock checks.
>
> And so we don't need that patch (nor for hid-sony.c) because we have a
> guard against scheduling a worker job when the device is being removed.
>
> So please drop 3,4,5 from this series, they are just making the code
> worse.

Sure.
I kept them only due to the Roderick Colenbrander's comment, but I'm happy
to remove them.
For reference:
> [...] I don't mind the change as it
> prevents the work scheduling functions to get called unnecessarily.
Link: https://lore.kernel.org/lkml/CAEc3jaCEKfqEJSV4=6GRj1Ry97xH+HwVSeEOZReNwkt=rLNvNQ@mail.gmail.com/

Thanks,
Pietro