Re: [PATCH v3] remoteproc: imx: Fix invalid loaded resource table detection

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Thu, Jan 29, 2026 at 06:02:21PM +0200, Daniel Baluta wrote:
> On Thu, Jan 29, 2026 at 3:45 AM Peng Fan (OSS) <peng.fan@oss.nxp.com> wrote:
> >
> > From: Peng Fan <peng.fan@nxp.com>
> >
> > imx_rproc_elf_find_loaded_rsc_table() may incorrectly report a loaded
> > resource table even when the current firmware does not provide one.
> >
> > When the device tree contains a "rsc-table" entry, priv->rsc_table is
> > non-NULL and denotes where a resource table would be located if one is
> > present in memory. However, when the current firmware has no resource
> > table, rproc->table_ptr is NULL. The function still returns
> > priv->rsc_table, and the remoteproc core interprets this as a valid loaded
> > resource table.
> >
> > Fix this by returning NULL from imx_rproc_elf_find_loaded_rsc_table() when
> > there is no resource table for the current firmware (i.e. when
> > rproc->table_ptr is NULL). This aligns the function's semantics with the
> > remoteproc core: a loaded resource table is only reported when a valid
> > table_ptr exists.
> >
> > With this change, starting firmware without a resource table no longer
> > triggers a crash.
> >
> > Fixes: e954a1bd1610 ("remoteproc: imx_rproc: Use imx specific hook for find_loaded_rsc_table")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> 
> Changes looks good to  me >
> 
> > --- a/drivers/remoteproc/imx_rproc.c
> > +++ b/drivers/remoteproc/imx_rproc.c
> > @@ -729,6 +729,10 @@ imx_rproc_elf_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *
> >  {
> >         struct imx_rproc *priv = rproc->priv;
> >
> > +       /* No resource table in the firmware */
> > +       if (!rproc->table_ptr)
> > +               return NULL;
> 
> I wonder if we can make this change generic because it should happen
> on other platforms also.
> 
> Maybe something like this:
> 
> remoteproc: core: Only copy loaded table when valid
> 
> Copy resource table in memory only when:
> * the current loaded firmware provides one
> AND
> * there is an explicit request to have the rsc table copied in memory
> via rsc-table
> 
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1281,7 +1281,7 @@ 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 (rproc->cached_table && loaded_table) {

But we would be doing the check for rproc->table_ptr twice (->table_ptr and
->cached_table should be the same).  The way it is currently writting forces
vendor specific implementation of rproc_elf_find_loaded_rsc_table() to do the
right thing.

The merge window has been pushed by a week, giving me an opportunity to merge
this patch.  Should I do that or should we continue discussing the best
approach?

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