Use dma_set_mask_and_coherent() instead of unrolling it with some dma_set_mask()+dma_set_coherent_mask(). Moreover, as stated in [1], dma_set_mask() with a 64-bit mask will never fail if dev->dma_mask is non-NULL. So, if it fails, the 32 bits case will also fail for the same reason. That said, 'pci_using_dac' can only be 1 after a successful dma_set_mask_and_coherent(). Simplify code and remove some dead code accordingly. [1]: https://lkml.org/lkml/2021/6/7/398 Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> --- drivers/net/ethernet/chelsio/cxgb/cxgb2.c | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c index 18acd7cf3d6d..f4054d2553ea 100644 --- a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c +++ b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c @@ -944,11 +944,11 @@ static const struct net_device_ops cxgb_netdev_ops = { static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { - int i, err, pci_using_dac = 0; unsigned long mmio_start, mmio_len; const struct board_info *bi; struct adapter *adapter = NULL; struct port_info *pi; + int i, err; err = pci_enable_device(pdev); if (err) @@ -961,17 +961,8 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) goto out_disable_pdev; } - if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) { - pci_using_dac = 1; - - if (dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) { - pr_err("%s: unable to obtain 64-bit DMA for coherent allocations\n", - pci_name(pdev)); - err = -ENODEV; - goto out_disable_pdev; - } - - } else if ((err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) != 0) { + err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); + if (err) { pr_err("%s: no usable DMA configuration\n", pci_name(pdev)); goto out_disable_pdev; } @@ -1043,10 +1034,8 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) netdev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_RXCSUM; netdev->features |= NETIF_F_SG | NETIF_F_IP_CSUM | - NETIF_F_RXCSUM | NETIF_F_LLTX; + NETIF_F_RXCSUM | NETIF_F_LLTX | NETIF_F_HIGHDMA; - if (pci_using_dac) - netdev->features |= NETIF_F_HIGHDMA; if (vlan_tso_capable(adapter)) { netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | -- 2.32.0
