DMA-API: net: intel/ixgbe: fix 32-bit DMA mask handling

commit f5f2eda8049644a27af5fdf59c3766589358e435 upstream.

The fallback to 32-bit DMA mask is rather odd:
	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) &&
	    !dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
		pci_using_dac = 1;
	} else {
		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
		if (err) {
			err = dma_set_coherent_mask(&pdev->dev,
						    DMA_BIT_MASK(32));
			if (err) {
				dev_err(&pdev->dev,
					"No usable DMA configuration, aborting\n");
				goto err_dma;
			}
		}
		pci_using_dac = 0;
	}
This means we only set the coherent DMA mask in the fallback path if
the DMA mask set failed, which is silly.  This fixes it to set the
coherent DMA mask only if dma_set_mask() succeeded, and to error out
if either fails.

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 0ade0cd5ef53ffab28b3fd34136374bfe9f4b51e..bf046e14ceb545313d777ba26d24edf4c785fe6f 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7490,19 +7490,14 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
        if (err)
                return err;
 
-       if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) &&
-           !dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
+       if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
                pci_using_dac = 1;
        } else {
-               err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+               err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
                if (err) {
-                       err = dma_set_coherent_mask(&pdev->dev,
-                                                   DMA_BIT_MASK(32));
-                       if (err) {
-                               dev_err(&pdev->dev,
-                                       "No usable DMA configuration, aborting\n");
-                               goto err_dma;
-                       }
+                       dev_err(&pdev->dev,
+                               "No usable DMA configuration, aborting\n");
+                       goto err_dma;
                }
                pci_using_dac = 0;
        }