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Date: Sat, 1 Jan 2022 20:04:45 +0100 From: Christophe JAILLET <christophe.jaillet@...adoo.fr> To: jgg@...pe.ca, davem@...emloft.net, kuba@...nel.org, arnd@...db.de, tanghui20@...wei.com, gustavoars@...nel.org Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org, Christophe JAILLET <christophe.jaillet@...adoo.fr> Subject: [PATCH] sun/cassini: Use dma_set_mask_and_coherent() and simplify code 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@...adoo.fr> --- drivers/net/ethernet/sun/cassini.c | 26 ++++++-------------------- 1 file changed, 6 insertions(+), 20 deletions(-) diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c index d2d4f47c7e28..dba9f12efa1c 100644 --- a/drivers/net/ethernet/sun/cassini.c +++ b/drivers/net/ethernet/sun/cassini.c @@ -4893,8 +4893,8 @@ static int cas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) unsigned long casreg_len; struct net_device *dev; struct cas *cp; - int i, err, pci_using_dac; u16 pci_cmd; + int i, err; u8 orig_cacheline_size = 0, cas_cacheline_size = 0; if (cas_version_printed++ == 0) @@ -4965,23 +4965,10 @@ static int cas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) /* Configure DMA attributes. */ - if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) { - pci_using_dac = 1; - err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); - if (err < 0) { - dev_err(&pdev->dev, "Unable to obtain 64-bit DMA " - "for consistent allocations\n"); - goto err_out_free_res; - } - - } else { - err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); - if (err) { - dev_err(&pdev->dev, "No usable DMA configuration, " - "aborting\n"); - goto err_out_free_res; - } - pci_using_dac = 0; + err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); + if (err) { + dev_err(&pdev->dev, "No usable DMA configuration, aborting\n"); + goto err_out_free_res; } casreg_len = pci_resource_len(pdev, 0); @@ -5087,8 +5074,7 @@ static int cas_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) if ((cp->cas_flags & CAS_FLAG_NO_HW_CSUM) == 0) dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; - if (pci_using_dac) - dev->features |= NETIF_F_HIGHDMA; + dev->features |= NETIF_F_HIGHDMA; /* MTU range: 60 - varies or 9000 */ dev->min_mtu = CAS_MIN_MTU; -- 2.32.0
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