Re: [PATCH V1] accel/amdxdna: Return ERR_PTR on dma_alloc_noncoherent failure
From: Mario Limonciello (AMD) (kernel.org)
Date: Mon Mar 23 2026 - 14:37:35 EST
On 3/23/2026 12:37 PM, Lizhi Hou wrote:
From: Wendy Liang <wendy.liang@xxxxxxx>Reviewed-by: Mario Limonciello (AMD) <superm1@xxxxxxxxxx>
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@xxxxxxx>
Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
---
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,