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path: root/drivers/gpu/drm/panthor/panthor_device.c
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Diffstat (limited to 'drivers/gpu/drm/panthor/panthor_device.c')
-rw-r--r--drivers/gpu/drm/panthor/panthor_device.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
index 4082c8f2951d..6fbff516c1c1 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -390,11 +390,15 @@ int panthor_device_mmap_io(struct panthor_device *ptdev, struct vm_area_struct *
{
u64 offset = (u64)vma->vm_pgoff << PAGE_SHIFT;
+ if ((vma->vm_flags & VM_SHARED) == 0)
+ return -EINVAL;
+
switch (offset) {
case DRM_PANTHOR_USER_FLUSH_ID_MMIO_OFFSET:
if (vma->vm_end - vma->vm_start != PAGE_SIZE ||
(vma->vm_flags & (VM_WRITE | VM_EXEC)))
return -EINVAL;
+ vm_flags_clear(vma, VM_MAYWRITE);
break;