linux-kernel - Re: [PATCH v3 3/7] remoteproc: core: Add check on cached

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Date: Fri, 23 Feb 2024 11:32:47 -0700
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	op-tee@...ts.trustedfirmware.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/7] remoteproc: core: Add check on cached_table
 pointer

On Wed, Feb 14, 2024 at 06:21:23PM +0100, Arnaud Pouliquen wrote:
> Add a check on the optional rproc->cached_table to perform the memory
> copy only if it is not null.
> 
> 2 use cases to support:
> - starting on boot, in which case rproc->cached_table can be null,
> - starting on crash recovery, where the cached table is used to save
>   the resource table configuration on stop and re-apply the configuration
>   on the re-start.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 283ca071e35c..34b0093689da 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1278,7 +1278,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>  	 * that any subsequent changes will be applied to the loaded version.
>  	 */
>  	loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
> -	if (loaded_table) {
> +	if (loaded_table && rproc->cached_table) {

.. and this becomes:

        if (loaded_table != rproc->cached_table)

with a detailed comment about what is going on and a reference to
tee_rproc_parse_fw().

There are other things to adjust in this patchset but starting with that will
hopefully deal with a few of them.  We can address the rest at the next
iteration.

I am done reviewing this set.

Thanks,
Mathieu
>  		memcpy(loaded_table, rproc->cached_table, rproc->table_sz);
>  		rproc->table_ptr = loaded_table;
>  	}
> -- 
> 2.25.1
>