linux-kernel - Re: [PATCH V2] remoteproc: core: Clear table_sz when rproc

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Message-ID: <20250403143239.GA22779@nxa18884-linux>
Date: Thu, 3 Apr 2025 22:32:39 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
	Arnaud Pouliquen <arnaud.pouliquen@...com>,
	"open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM" <linux-remoteproc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V2] remoteproc: core: Clear table_sz when rproc_shutdown

Hi Bjorn,


Thanks for replying this thread.

On Wed, Apr 02, 2025 at 08:48:58AM -0500, Bjorn Andersson wrote:
>On Wed, Apr 02, 2025 at 09:43:55AM +0800, Peng Fan wrote:
>> On Tue, Apr 01, 2025 at 10:05:03AM -0600, Mathieu Poirier wrote:
>> >On Tue, Apr 01, 2025 at 09:41:24AM +0800, Peng Fan wrote:
>...
>> >
>> >The core is already checking if @loaded_table is valid in rproc_start(), why
>> >can't that be used instead of adding yet another check?
>> 
>> Ah. I was thinking clear table_sz in rpoc_shutdown is an easy approach and
>> could benifit others in case other platforms meet similar issue in future.
>> 
>
>I like the general idea of keeping things clean and avoid leaving stale
>data behind.
>
>But clearing table_sz during stop in order to hide the fact that the
>future table_ptr will contain valid data that shouldn't be used, that's
>just a bug waiting to show up again in the future.

Agree.

Do you need me to post a fix for
commit efdde3d73ab25ce("remoteproc: core: Clear table_sz when rproc_shutdown")
by clearing table_sz in rproc_fw_boot and rproc_detach as did in this v2?

To i.MX, the above in-tree patch is ok, so all it fine, and this v2 patch
could be dropped.

But anyway, if you prefer a follow up fix, please let me know, I
could post a patch.

Thanks,
Peng

>
>Regards,
>Bjorn
>