[PATCH v2] media: verisilicon: Fix kernel panic due to __initconst misuse

[ming.qian at oss.nxp.com]

From: Ming Qian <ming.qian at oss.nxp.com>

Fix a kernel panic when probing the driver as a module:

  Unable to handle kernel paging request at virtual address
  ffffd9c18eb05000
  of_find_matching_node_and_match+0x5c/0x1a0
  hantro_probe+0x2f4/0x7d0 [hantro_vpu]

The imx8mq_vpu_shared_resources array is referenced by variant
structures through their shared_devices field. When built as a
module, __initconst causes this data to be freed after module
init, but it's later accessed during probe, causing a page fault.

The imx8mq_vpu_shared_resources is referenced from non-init code,
so keeping __initconst or __initconst_or_module here is wrong.

Drop the __initconst annotation and let it live in the normal .rodata
section.

Fixes: e0203ddf9af7 ("media: verisilicon: Avoid G2 bus error while decoding H.264 and HEVC")
Reported-by: Franz Schnyder <franz.schnyder at toradex.com>
Closes: https://lore.kernel.org/all/n3qmcb62tepxltoskpf7ws6yiirc2so62ia23b42rj3wlmpl67@rvkbuirx7kkp/
Suggested-by: Marco Felsch <m.felsch at pengutronix.de>
Signed-off-by: Ming Qian <ming.qian at oss.nxp.com>
---
v2
- Remove __initconst
- Add missing Reported-by tag
- Add missing Suggested-by tag
- Remove comments of sentinel to pass checkpatch.pl

 drivers/media/platform/verisilicon/imx8m_vpu_hw.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/verisilicon/imx8m_vpu_hw.c b/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
index 6f8e43b7f157..6fbe3c581032 100644
--- a/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
+++ b/drivers/media/platform/verisilicon/imx8m_vpu_hw.c
@@ -343,10 +343,10 @@ const struct hantro_variant imx8mq_vpu_variant = {
 	.num_regs = ARRAY_SIZE(imx8mq_reg_names)
 };
 
-static const struct of_device_id imx8mq_vpu_shared_resources[] __initconst = {
+static const struct of_device_id imx8mq_vpu_shared_resources[] = {
 	{ .compatible = "nxp,imx8mq-vpu-g1", },
 	{ .compatible = "nxp,imx8mq-vpu-g2", },
-	{ /* sentinel */ }
+	{}
 };
 
 const struct hantro_variant imx8mq_vpu_g1_variant = {
-- 
2.52.0