drm/amdgpu: Fix off-by-one errors in amdgpu_vm_bo_map

eaddr is sometimes treated as the last address inside the address
range, and sometimes as the first address outside the range. This
was resulting in errors when a test filled up the entire address
space. Make it consistent to always be the last address within the
range.

Signed-off-by: Felix.Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index e0fa9d9ff5c2..d6ff5dad98f6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1010,13 +1010,13 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
                 return -EINVAL;
 
         /* make sure object fit at this offset */
-        eaddr = saddr + size;
+        eaddr = saddr + size - 1;
         if ((saddr >= eaddr) || (offset + size > amdgpu_bo_size(bo_va->bo)))
                 return -EINVAL;
 
         last_pfn = eaddr / AMDGPU_GPU_PAGE_SIZE;
-        if (last_pfn > adev->vm_manager.max_pfn) {
-                dev_err(adev->dev, "va above limit (0x%08X > 0x%08X)\n",
+        if (last_pfn >= adev->vm_manager.max_pfn) {
+                dev_err(adev->dev, "va above limit (0x%08X >= 0x%08X)\n",
                         last_pfn, adev->vm_manager.max_pfn);
                 return -EINVAL;
         }
@@ -1025,7 +1025,7 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
         eaddr /= AMDGPU_GPU_PAGE_SIZE;
 
         spin_lock(&vm->it_lock);
-        it = interval_tree_iter_first(&vm->va, saddr, eaddr - 1);
+        it = interval_tree_iter_first(&vm->va, saddr, eaddr);
         spin_unlock(&vm->it_lock);
         if (it) {
                 struct amdgpu_bo_va_mapping *tmp;
@@ -1046,7 +1046,7 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
 
         INIT_LIST_HEAD(&mapping->list);
         mapping->it.start = saddr;
-        mapping->it.last = eaddr - 1;
+        mapping->it.last = eaddr;
         mapping->offset = offset;
         mapping->flags = flags;