Re: [PATCH V1] accel/amdxdna: Return ERR_PTR on dma_alloc_noncoherent failure

["Mario Limonciello (AMD) (kernel.org)" <superm1@kernel.org>]

On 3/23/2026 12:37 PM, Lizhi Hou wrote:
> From: Wendy Liang <wendy.liang@amd.com>
> 
> dma_alloc_noncoherent() returns NULL on failure, but callers of
> aie2_alloc_msg_buffer() check for IS_ERR(). Return ERR_PTR(-ENOMEM)
> instead of NULL to match the amdxdna_iommu_alloc() path and the
> caller's error checking convention.
> 
> Fixes: ece3e8980907 ("accel/amdxdna: Allow forcing IOVA-based DMA via module parameter")
> Signed-off-by: Wendy Liang <wendy.liang@amd.com>
> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
> ---
>   drivers/accel/amdxdna/aie2_message.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/amdxdna/aie2_message.c b/drivers/accel/amdxdna/aie2_message.c
> index 7e219a5eda56..a1c546c3e81c 100644
> --- a/drivers/accel/amdxdna/aie2_message.c
> +++ b/drivers/accel/amdxdna/aie2_message.c
> @@ -56,6 +56,7 @@ void *aie2_alloc_msg_buffer(struct amdxdna_dev_hdl *ndev, u32 *size,
>   			    dma_addr_t *dma_addr)
>   {
>   	struct amdxdna_dev *xdna = ndev->xdna;
> +	void *vaddr;
>   	int order;
>   
>   	*size = max(*size, SZ_8K);
> @@ -67,8 +68,12 @@ void *aie2_alloc_msg_buffer(struct amdxdna_dev_hdl *ndev, u32 *size,
>   	if (amdxdna_iova_on(xdna))
>   		return amdxdna_iommu_alloc(xdna, *size, dma_addr);
>   
> -	return dma_alloc_noncoherent(xdna->ddev.dev, *size, dma_addr,
> +	vaddr = dma_alloc_noncoherent(xdna->ddev.dev, *size, dma_addr,
>   				      DMA_FROM_DEVICE, GFP_KERNEL);
> +	if (!vaddr)
> +		return ERR_PTR(-ENOMEM);
> +
> +	return vaddr;
>   }
>   
>   void aie2_free_msg_buffer(struct amdxdna_dev_hdl *ndev, size_t size,
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>