iommu/exynos: Don't unconditionally steal bus ops
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Web: https://git.kernel.org/torvalds/c/dc98b8480d8a68c2ce9aa28b9f0d714fd258bc0b Commit: dc98b8480d8a68c2ce9aa28b9f0d714fd258bc0b Parent: a8750ddca918032d6349adbf9a4b6555e7db20da Refname: refs/heads/master Author: Robin Murphy <[email protected]> AuthorDate: Tue Jan 9 15:34:07 2018 +0000 Committer: Joerg Roedel <[email protected]> CommitDate: Wed Jan 17 14:38:31 2018 +0100 iommu/exynos: Don't unconditionally steal bus ops Removing the early device registration hook overlooked the fact that it only ran conditionally on a compatible device being present in the DT. With exynos_iommu_init() now running as an unconditional initcall, problems arise on non-Exynos systems when other IOMMU drivers find themselves unable to install their ops on the platform bus, or at worst the Exynos ops get called with someone else's domain and all hell breaks loose. The global ops/cache setup could probably all now be triggered from the first IOMMU probe, as with dma_dev assigment, but for the time being the simplest fix is to resurrect the logic from commit a7b67cd5d9af ("iommu/exynos: Play nice in multi-platform builds") to explicitly check the DT for the presence of an Exynos IOMMU before trying anything. Fixes: 928055a01b3f ("iommu/exynos: Remove custom platform device registration code") Signed-off-by: Robin Murphy <[email protected]> Acked-by: Marek Szyprowski <[email protected]> Signed-off-by: Joerg Roedel <[email protected]> --- drivers/iommu/exynos-iommu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 79c45650f8de..736d4552d96f 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -1353,8 +1353,15 @@ static const struct iommu_ops exynos_iommu_ops = { static int __init exynos_iommu_init(void) { + struct device_node *np; int ret; + np = of_find_matching_node(NULL, sysmmu_of_match); + if (!np) + return 0; + + of_node_put(np); + lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); if (!lv2table_kmem_cache) { -- To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html