diff mbox series

sun/cassini: Use dma_set_mask_and_coherent() and simplify code

Message ID 9608eda38887c50ac7399ea1b41f977709678ea3.1641063795.git.christophe.jaillet@wanadoo.fr (mailing list archive)
State Accepted
Commit 584c61cedb12f983e97a01762457b75dfdef626b
Delegated to: Netdev Maintainers
Headers show
Series sun/cassini: Use dma_set_mask_and_coherent() and simplify code | expand

Checks

Context Check Description
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
netdev/cc_maintainers success CCed 4 of 4 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 45 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Christophe JAILLET Jan. 1, 2022, 7:04 p.m. UTC 
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@wanadoo.fr>
---
 drivers/net/ethernet/sun/cassini.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Jan. 2, 2022, 4:20 p.m. UTC | #1 
Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat,  1 Jan 2022 20:04:45 +0100 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - sun/cassini: Use dma_set_mask_and_coherent() and simplify code
    https://git.kernel.org/netdev/net-next/c/584c61cedb12

You are awesome, thank you!
diff mbox series

Patch

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;