netdev - [PATCH 2/5] bnxt_en: use pci_get

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Date:   Thu, 27 Feb 2020 14:36:32 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     linux-pci@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jacob Keller <jacob.e.keller@...el.com>,
        Michael Chan <michael.chan@...adcom.com>
Subject: [PATCH 2/5] bnxt_en: use pci_get_dsn

Replace the open-coded implementation for reading the PCIe DSN with
pci_get_dsn.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Cc: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 597e6fd5bfea..55f078fc067e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -11755,20 +11755,14 @@ static int bnxt_init_mac_addr(struct bnxt *bp)
 static int bnxt_pcie_dsn_get(struct bnxt *bp, u8 dsn[])
 {
 	struct pci_dev *pdev = bp->pdev;
-	int pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DSN);
-	u32 dw;
+	int err;
 
-	if (!pos) {
+	err = pci_get_dsn(pdev, dsn);
+	if (err) {
 		netdev_info(bp->dev, "Unable do read adapter's DSN");
-		return -EOPNOTSUPP;
+		return err;
 	}
 
-	/* DSN (two dw) is at an offset of 4 from the cap pos */
-	pos += 4;
-	pci_read_config_dword(pdev, pos, &dw);
-	put_unaligned_le32(dw, &dsn[0]);
-	pci_read_config_dword(pdev, pos + 4, &dw);
-	put_unaligned_le32(dw, &dsn[4]);
 	bp->flags |= BNXT_FLAG_DSN_VALID;
 	return 0;
 }
-- 
2.25.0.368.g28a2d05eebfb