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

[Lizhi Hou <lizhi.hou@amd.com>]

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,
-- 
2.34.1