diff mbox series

myri10ge: Simplify DMA setting

Message ID e92b0c3a3c1574a97a4e6fd0c30225f10fa59d18.1641651693.git.christophe.jaillet@wanadoo.fr (mailing list archive)
State Accepted
Commit 21ef11eaf3f78dda7fd20abe6e60e27038cb06a3
Delegated to: Netdev Maintainers
Headers show
Series myri10ge: Simplify DMA setting | 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: 0 this patch: 0
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: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 32 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. 8, 2022, 2:22 p.m. UTC 
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.

If dma_set_mask_and_coherent() succeeds, 'dac_enabled' 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>
---
 drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Jan. 10, 2022, 1 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Sat,  8 Jan 2022 15:22:13 +0100 you wrote:
> 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.
> 
> If dma_set_mask_and_coherent() succeeds, 'dac_enabled' is known to be 1.
> 
> Simplify code and remove some dead code accordingly.
> 
> [...]

Here is the summary with links:
  - myri10ge: Simplify DMA setting
    https://git.kernel.org/netdev/net-next/c/21ef11eaf3f7

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
index 83a5e29c836a..50ac3ee2577a 100644
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
@@ -3742,7 +3742,6 @@  static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct myri10ge_priv *mgp;
 	struct device *dev = &pdev->dev;
 	int status = -ENXIO;
-	int dac_enabled;
 	unsigned hdr_offset, ss_offset;
 	static int board_number;
 
@@ -3782,14 +3781,7 @@  static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	myri10ge_mask_surprise_down(pdev);
 	pci_set_master(pdev);
-	dac_enabled = 1;
 	status = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
-	if (status != 0) {
-		dac_enabled = 0;
-		dev_err(&pdev->dev,
-			"64-bit pci address mask was refused, trying 32-bit\n");
-		status = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-	}
 	if (status != 0) {
 		dev_err(&pdev->dev, "Error %d setting DMA mask\n", status);
 		goto abort_with_enabled;
@@ -3874,10 +3866,7 @@  static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* fake NETIF_F_HW_VLAN_CTAG_RX for good GRO performance */
 	netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
 
-	netdev->features = netdev->hw_features;
-
-	if (dac_enabled)
-		netdev->features |= NETIF_F_HIGHDMA;
+	netdev->features = netdev->hw_features | NETIF_F_HIGHDMA;
 
 	netdev->vlan_features |= mgp->features;
 	if (mgp->fw_ver_tiny < 37)