linux-kernel - Re: Re: [PATCH v6.1] drm/amd/display: Check dce

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Message-ID: <2026012033-jelly-hunger-fed8@gregkh>
Date: Tue, 20 Jan 2026 12:06:50 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Rahul Sharma <black.hawk@....com>
Cc: stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Hung <alex.hung@....com>,
	Mario Limonciello <mario.limonciello@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Aurabindo Pillai <aurabindo.pillai@....com>
Subject: Re: Re: [PATCH v6.1] drm/amd/display: Check dce_hwseq before
 dereferencing it

On Fri, Jan 16, 2026 at 10:57:51AM +0800, Rahul Sharma wrote:
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> At 2026-01-15 19:44:04, "Greg KH" <gregkh@...uxfoundation.org> wrote:
> >On Thu, Jan 15, 2026 at 12:19:19PM +0800, Rahul Sharma wrote:
> >> From: Alex Hung <alex.hung@....com>
> >> 
> >> [ Upstream b669507b637eb6b1aaecf347f193efccc65d756e commit ]
> >> 
> >> [WHAT]
> >> 
> >> hws was checked for null earlier in dce110_blank_stream, indicating hws
> >> can be null, and should be checked whenever it is used.
> >> 
> >> Cc: Mario Limonciello <mario.limonciello@....com>
> >> Cc: Alex Deucher <alexander.deucher@....com>
> >> Reviewed-by: Aurabindo Pillai <aurabindo.pillai@....com>
> >> Signed-off-by: Alex Hung <alex.hung@....com>
> >> Signed-off-by: Aurabindo Pillai <aurabindo.pillai@....com>
> >> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> >> (cherry picked from commit 79db43611ff61280b6de58ce1305e0b2ecf675ad)
> >> Cc: stable@...r.kernel.org
> >> [ The context change is due to the commit 8e7b3f5435b3
> >> ("drm/amd/display: Add control flag to dc_stream_state to skip eDP BL off/link off")
> >> and the commit a8728dbb4ba2 ("drm/amd/display: Refactor edp power
> >> control") and the proper adoption is done. ]
> >> Signed-off-by: Rahul Sharma <black.hawk@....com>
> >> ---
> >>  drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> >We need 6.6.y backport first, before we can take this one, for obvious
> >reasons (i.e. you do not want to have a regression).  Can you submit
> >that one first and then this again?
> 
> >
> Thanks Greg, I have sent out the backported patch for 6.6.y.

Great, can you resend this one as well?  It's long-gone from my mail
system.

thanks,

greg k-h