From: Peng Fan Date: Tue, 10 Feb 2026 08:12:16 +0000 (+0800) Subject: iommu: Validate device tree node in dev_iommu_enable X-Git-Tag: v2026.04-rc4~17^2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=efc9be77d851b98b38afcfb4e46d17703057efad;p=thirdparty%2Fu-boot.git iommu: Validate device tree node in dev_iommu_enable 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 7eb4eb541c14 ("firmware: scmi: install base protocol to SCMI agent")' However with recent update in 'commit 0535e46d55d7 ("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 Closes: https://lore.kernel.org/u-boot/939a9696-27fa-45a1-b428-feffe21ac6d5@oss.nxp.com/ Signed-off-by: Peng Fan --- diff --git a/drivers/iommu/iommu-uclass.c b/drivers/iommu/iommu-uclass.c index bb31cd519d2..31b40e5713a 100644 --- a/drivers/iommu/iommu-uclass.c +++ b/drivers/iommu/iommu-uclass.c @@ -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++) {