net/qla3xxx: 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/3011689e8c77d49d7e44509d5a8241320ec408c5.1641754134.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index 71523d7..b30589a 100644 (file)
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -3750,7 +3750,7 @@ static int ql3xxx_probe(struct pci_dev *pdev,
        struct net_device *ndev = NULL;
        struct ql3_adapter *qdev = NULL;
        static int cards_found;
-       int pci_using_dac, err;
+       int err;
 
        err = pci_enable_device(pdev);
        if (err) {
@@ -3766,11 +3766,7 @@ static int ql3xxx_probe(struct pci_dev *pdev,
 
        pci_set_master(pdev);
 
-       if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)))
-               pci_using_dac = 1;
-       else if (!(err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))))
-               pci_using_dac = 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 err_out_free_regions;
@@ -3797,8 +3793,7 @@ static int ql3xxx_probe(struct pci_dev *pdev,
 
        qdev->msg_enable = netif_msg_init(debug, default_msg);
 
-       if (pci_using_dac)
-               ndev->features |= NETIF_F_HIGHDMA;
+       ndev->features |= NETIF_F_HIGHDMA;
        if (qdev->device_id == QL3032_DEVICE_ID)
                ndev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;