[PATCH 1/2] RDMA/hfi1: Remove obsolete 32-bit DMA mask fallback

[Ruizhe Zhou]

The DMA API guarantees support for masks of 32 bits or wider and
explicitly identifies retrying a 32-bit mask after a 64-bit request as
incorrect:
https://docs.kernel.org/core-api/dma-api-howto.html#dma-addressing-capabilities

Remove the obsolete fallback while retaining the error check so that a
genuine DMA setup failure is still reported and aborts initialization.

Signed-off-by: Ruizhe Zhou <zhouruizhe@xxxxxxxxxxx>
---
 drivers/infiniband/hw/hfi1/pcie.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
index 1154b8cc713c..106bed4932c8 100644
--- a/drivers/infiniband/hw/hfi1/pcie.c
+++ b/drivers/infiniband/hw/hfi1/pcie.c
@@ -53,17 +53,9 @@ int hfi1_pcie_init(struct pci_dev *pdev)
 
 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 	if (ret) {
-		/*
-		 * If the 64 bit setup fails, try 32 bit.  Some systems
-		 * do not setup 64 bit maps on systems with 2GB or less
-		 * memory installed.
-		 */
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (ret) {
-			dev_err(&pdev->dev, "Unable to set DMA mask: %pe\n",
-				ERR_PTR(ret));
-			goto bail;
-		}
+		dev_err(&pdev->dev, "Unable to set DMA mask: %pe\n",
+			ERR_PTR(ret));
+		goto bail;
 	}
 
 	pci_set_master(pdev);
-- 
2.27.0