Re: [PATCH v7 03/22] iommu/dma: Check atomic pool allocation result directly

[Jason Gunthorpe]

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 <mhklinux@xxxxxxxxxxx>
> Tested-by: Mostafa Saleh <smostafa@xxxxxxxxxx>
> Reviewed-by: Petr Tesarik <ptesarik@xxxxxxxx>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@xxxxxxxxxx>
> ---
>  drivers/iommu/dma-iommu.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason