diff options
| author | Christophe JAILLET <christophe.jaillet@wanadoo.fr> | 2022-01-09 16:59:48 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-01-10 03:52:20 +0300 |
| commit | 030f9ce8c739a5cfa420291188023b7741b7bc73 (patch) | |
| tree | 9354703d24ee22e321caa904f889d8e9bebe7175 /drivers/net/ethernet | |
| parent | 7fc7fc5da61bfb0ed6056243de3bb17bfbce9f53 (diff) | |
| download | linux-030f9ce8c739a5cfa420291188023b7741b7bc73.tar.xz | |
cxgb4vf: Remove useless DMA-32 fallback configuration
As stated in [1], dma_set_mask() with a 64-bit mask never fails if
dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.
So, if dma_set_mask_and_coherent() succeeds, 'pci_using_dac' is known to be
1.
Simplify code and remove some dead code accordingly.
[1]: https://lkml.org/lkml/2021/6/7/398
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/b14986ea39cea2ca9a6cd0476a3fc167c853ee67.1641736772.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c index acac2be0e3f0..7de3800437c9 100644 --- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c @@ -2899,7 +2899,6 @@ static int cxgb4vf_pci_probe(struct pci_dev *pdev, struct net_device *netdev; struct port_info *pi; unsigned int pmask; - int pci_using_dac; int err, pidx; /* @@ -2920,19 +2919,12 @@ static int cxgb4vf_pci_probe(struct pci_dev *pdev, } /* - * Set up our DMA mask: try for 64-bit address masking first and - * fall back to 32-bit if we can't get 64 bits ... + * Set up our DMA mask */ err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); - if (err == 0) { - pci_using_dac = 1; - } else { - err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); - if (err != 0) { - dev_err(&pdev->dev, "no usable DMA configuration\n"); - goto err_release_regions; - } - pci_using_dac = 0; + if (err) { + dev_err(&pdev->dev, "no usable DMA configuration\n"); + goto err_release_regions; } /* @@ -3078,9 +3070,7 @@ static int cxgb4vf_pci_probe(struct pci_dev *pdev, netdev->hw_features = NETIF_F_SG | TSO_FLAGS | NETIF_F_GRO | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX; - netdev->features = netdev->hw_features; - if (pci_using_dac) - netdev->features |= NETIF_F_HIGHDMA; + netdev->features = netdev->hw_features | NETIF_F_HIGHDMA; netdev->vlan_features = netdev->features & VLAN_FEAT; netdev->priv_flags |= IFF_UNICAST_FLT; |