linux-kernel - Re: [PATCH v2 00/10] drm/msm: probe deferral fixes

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Message-ID: <Y1Z4HrEcLDhe6gQr@hovoldconsulting.com>
Date:   Mon, 24 Oct 2022 13:33:50 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Steev Klimaszewski <steev@...i.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/10] drm/msm: probe deferral fixes

On Fri, Oct 21, 2022 at 09:05:52AM -0700, Abhinav Kumar wrote:
> Hi Johan
> 
> On 10/20/2022 11:27 PM, Johan Hovold wrote:
> > On Tue, Sep 20, 2022 at 11:06:30AM +0200, Johan Hovold wrote:
> >> On Tue, Sep 13, 2022 at 10:53:10AM +0200, Johan Hovold wrote:
> >>> The MSM DRM driver is currently broken in multiple ways with respect to
> >>> probe deferral. Not only does the driver currently fail to probe again
> >>> after a late deferral, but due to a related use-after-free bug this also
> >>> triggers NULL-pointer dereferences.
> >>>
> >>> These bugs are not new but have become critical with the release of
> >>> 5.19 where probe is deferred in case the aux-bus EP panel driver has not
> >>> yet been loaded.
> >>>
> >>> The underlying problem is lifetime issues due to careless use of
> >>> device-managed resources.
> >>
> >> Any chance of getting this merged for 6.1?
> > 
> > Is anyone picking these up as fixes for 6.1-rc as we discussed?
> > 
> > Johan
> 
> All of these except the last two ( as discussed ) have landed in the 
> -fixes tree
> 
> https://gitlab.freedesktop.org/drm/msm/-/commit/6808abdb33bf90330e70a687d29f038507e06ebb

Ah, perfect, thanks.

When do you expect to send these on so that they end up in linux-next
and eventually Linus's tree?

Note that it looks like something happened with the commit messages when
you applied these. Specifically, the Fixes tags appears to now have a
line break in them and there's also some random whitespace before your
SoB:

	Fixes: c3bf8e21
	
	 ("drm/msm/dp: Add eDP support via aux_bus")
	Cc: stable@...r.kernel.org      # 5.19
	Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
	Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
	Tested-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
	Reviewed-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
	Patchwork: https://patchwork.freedesktop.org/patch/502667/
	Link: https://lore.kernel.org/r/20220913085320.8577-8-johan+linaro@kernel.org
	
	
	Signed-off-by: Abhinav Kumar's avatarAbhinav Kumar <quic_abhinavk@...cinc.com>

It's possible just the gitlab UI that's messed up, but perhaps you can
double check before they hit linux-next, which should complain about
this otherwise.

Johan