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drm/etnaviv: check for reaped mapping in etnaviv_iommu_unmap_gem

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commit e168c25526 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@vger.kernel.org # 5.4
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lucas Stach 2022-03-23 17:08:22 +01:00 committed by Greg Kroah-Hartman
parent a2d3de6df2
commit 461c0fdf94
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/etnaviv/etnaviv_mmu.c
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@ -286,6 +286,12 @@ void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
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);