[PATCH 3/5] iommu/virtio: Sort reserved regions

[Jean-Philippe Brucker]

To ease identity mapping support, keep the list of reserved regions
sorted.

Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org>
---
 drivers/iommu/virtio-iommu.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index ee8a7afd667b..d63ec4d11b00 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -423,7 +423,7 @@ static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
        size_t size;
        u64 start64, end64;
        phys_addr_t start, end;
-       struct iommu_resv_region *region = NULL;
+       struct iommu_resv_region *region = NULL, *next;
        unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
 
        start = start64 = le64_to_cpu(mem->start);
@@ -454,7 +454,12 @@ static int viommu_add_resv_mem(struct viommu_endpoint 
*vdev,
        if (!region)
                return -ENOMEM;
 
-       list_add(&region->list, &vdev->resv_regions);
+       /* Keep the list sorted */
+       list_for_each_entry(next, &vdev->resv_regions, list) {
+               if (next->start > region->start)
+                       break;
+       }
+       list_add_tail(&region->list, &next->list);
        return 0;
 }
 
-- 
2.33.0

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