misc: pci_endpoint_test: Refactor dma_set_mask_and_coherent() logic

dma_set_mask_and_coherent() should never fail when the mask is >= 32bit,
unless the architecture has no DMA support. So no need to check for the
error and also no need to set dma_set_mask_and_coherent(32) as a fallback.

Even if dma_set_mask_and_coherent(48) fails due to the lack of DMA support
(theoretically), then dma_set_mask_and_coherent(32) will also fail for the
same reason. So the fallback doesn't make sense.

Simplify the code by setting the streaming and coherent DMA mask to 48
bits.

Link: https://lore.kernel.org/linux-pci/20240502195903.3191049-1-Frank.Li@nxp.com
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 2e0a66e..0ffc8e0 100644 (file)
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -857,11 +857,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
        init_completion(&test->irq_raised);
        mutex_init(&test->mutex);
 
-       if ((dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48)) != 0) &&
-           dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)) != 0) {
-               dev_err(dev, "Cannot set DMA mask\n");
-               return -EINVAL;
-       }
+       dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
 
        err = pci_enable_device(pdev);
        if (err) {