[PATCH 1/2] drm/gpusvm: Force unmapping on error in drm_gpusvm_get_pages

[Matthew Brost <matthew.brost@intel.com>]

drm_gpusvm_get_pages() only sets the local flags prior to committing the
pages. If an error occurs mid-mapping, has_dma_mapping will be clear,
causing the unmap function to skip unmapping pages that were
successfully mapped before the error. Fix this by forcibly setting
has_dma_mapping in the error path to ensure all previously mapped pages
are properly unmapped.

Fixes: 99624bdff867 ("drm/gpusvm: Add support for GPU Shared Virtual Memory")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/drm_gpusvm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c
index aa9a0b60e727..d733599ceb9a 100644
--- a/drivers/gpu/drm/drm_gpusvm.c
+++ b/drivers/gpu/drm/drm_gpusvm.c
@@ -1572,6 +1572,7 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm,
 	return 0;
 
 err_unmap:
+	svm_pages->flags.has_dma_mapping = true;
 	__drm_gpusvm_unmap_pages(gpusvm, svm_pages, num_dma_mapped);
 	drm_gpusvm_notifier_unlock(gpusvm);
 err_free:
-- 
2.34.1