linux-kernel - Re: [PATCHv2] media: venc: destroy hfi session after m2m

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Message-ID: <xkmtptaqzvwe2px7q7ypnkltpx6jnnjeh5mgbirajzbomtsjyz@gefwjgfsjnv7>
Date: Fri, 20 Dec 2024 13:32:48 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Stanimir Varbanov <stanimir.k.varbanov@...il.com>, Vikash Garodia <quic_vgarodia@...cinc.com>, 
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>, Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCHv2] media: venc: destroy hfi session after m2m_ctx release

On (24/12/19 15:12), Dmitry Baryshkov wrote:
> On Thu, Dec 19, 2024 at 02:37:08PM +0900, Sergey Senozhatsky wrote:
> > This partially reverts commit that made hfi_session_destroy()
> > the first step of vdec/venc close().  The reason being is a
> > regression report when, supposedly, encode/decoder is closed
> > with still active streaming (no ->stop_streaming() call before
> > close()) and pending pkts, so isr_thread cannot find instance
> > and fails to process those pending pkts.  This was the idea
> > behind the original patch - make it impossible to use instance
> > under destruction, because this is racy, but apparently there
> > are uses cases that depend on that unsafe pattern.  Return to
> > the old (unsafe) behaviour for the time being (until a better
> > fix is found).
> 
> You are describing a regression. Could you please add corresponding
> Reported-by and Closes tags (for now you can post them in a reply to
> your patch, in future please include them in your commit message).

The regression report is internal, I don't have anything public.
One of the teams found out that some of their tests started to
fail.

> > Fixes: 45b1a1b348ec ("media: venus: sync with threaded IRQ during inst destruction")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
> 
> This is v2, but there is no changelog. Please provide one.

The code is obviously the same, I only added Cc: stable and removed
one extra character in commit id "45b1a1b348ec".