From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
commit e168c25526cd0368af098095c2ded4a008007e1b upstream.
When the mapping is already reaped the unmap must be a no-op, as we
would otherwise try to remove the mapping twice, corrupting the involved
data structures.
Cc: stable@xxxxxxxxxxxxxxx # 5.4
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Tested-by: Guido Günther <agx@xxxxxxxxxxx>
Acked-by: Guido Günther <agx@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -289,6 +289,12 @@ void etnaviv_iommu_unmap_gem(struct etna
mutex_lock(&context->lock);
+ /* Bail if the mapping has been reaped by another thread */
+ if (!mapping->context) {
+ mutex_unlock(&context->lock);
+ return;
+ }
+
/* If the vram node is on the mm, unmap and remove the node */
if (mapping->vram_node.mm == &context->mm)
etnaviv_iommu_remove_mapping(context, mapping);
