On Wed, Jul 01, 2026 at 11:19:07AM +0530, Aneesh Kumar K.V (Arm) wrote:

The non-blocking, non-coherent allocation path uses dma_alloc_from_pool(),
which returns the allocated page and fills cpu_addr only on success.

Do not rely on cpu_addr to detect allocation failure in this path. Check
the returned page directly before using it for the IOMMU mapping.

Fixes: 9420139f516d ("dma-pool: fix coherent pool allocations for IOMMU mappings")
Tested-by: Michael Kelley <redacted>
Tested-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Petr Tesarik <redacted>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
 drivers/iommu/dma-iommu.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason