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iommu: Validate device tree node in dev_iommu_enable

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Similar to pinctrl_select_state(), add dev_has_ofnode() check before doing the
real work. Device(scmi_base.0) does not have a real device node, ofnode_null()
is assigned as the device tree node for scmi base protocol device:
'commit 7eb4eb541c ("firmware: scmi: install base protocol to SCMI agent")'

However with recent update in
'commit 0535e46d55 ("scripts/dtc: Update to upstream version v1.7.2-35-g52f07dcca47c")',
SPL panic in fdt_check_node_offset_()->fdt_next_tag(), because offset is -1
and SPL_OF_LIBFDT_ASSUME_MASK is 0xFF.

So need to validate device tree node.

Reported-by: Ye Li <ye.li@nxp.com>
Closes: https://lore.kernel.org/u-boot/939a9696-27fa-45a1-b428-feffe21ac6d5@oss.nxp.com/
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Peng Fan
2026-02-10 16:12:16 +08:00
committed by Tom Rini
parent 6ee82240de
commit efc9be77d8
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/iommu-uclass.c
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@@ -79,6 +79,9 @@ int dev_iommu_enable(struct udevice *dev)
const struct iommu_ops *ops;
int i, count, ret = 0;
if (!dev_has_ofnode(dev))
return 0;
count = dev_count_phandle_with_args(dev, "iommus",
"#iommu-cells", 0);
for (i = 0; i < count; i++) {