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

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@xxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
Changes in v3:
- Update patch subject and commit message using this one [1]
  [1] https://lore.kernel.org/all/CANLsYkyrz+A1iEabGZ6rFybFo4=mM+TPVDRSckFB2YUS_7aKow@xxxxxxxxxxxxxx/
- Link to v2: https://lore.kernel.org/r/20260127-imx-rproc-fix-v2-1-7288fcf74385@xxxxxxx

Changes in v2:
- Per Mathieu, Check rproc->table_ptr, update commit log
- Include R-b from Frank
- Link to v1: https://lore.kernel.org/r/20260122-imx-rproc-fix-v1-1-36cc64369a40@xxxxxxx
---
 drivers/remoteproc/imx_rproc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 375de79168a1c8d11b87ac1bd63774a3feac106d..f5f916d6790519360f446f063e09d018c5654953 100644
--- 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;
+
 	if (priv->rsc_table)
 		return (struct resource_table *)priv->rsc_table;
 

---
base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
change-id: 20260122-imx-rproc-fix-e206f8e6e477

Best regards,
-- 
Peng Fan <peng.fan@xxxxxxx>