diff mbox series

[08/17] net/mlx5: Use pcie_lnkctl_clear_and_set() for changing LNKCTL

Message ID 20230511131441.45704-9-ilpo.jarvinen@linux.intel.com (mailing list archive)
State Superseded
Headers show
Series PCI: Improve LNKCTL & LNKCTL2 concurrency control | expand

Commit Message

Ilpo Järvinen May 11, 2023, 1:14 p.m. UTC 
Don't assume that only the driver would be accessing LNKCTL of the
upstream (bridge). ASPM policy changes can trigger write to LNKCTL
outside of driver's control.

Use pcie_lnkctl_clear_and_set() which does proper locking to avoid
losing concurrent updates to the register value.

Suggested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
index 50022e7565f1..2c3d69f3a107 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -332,16 +332,11 @@  static int mlx5_pci_link_toggle(struct mlx5_core_dev *dev)
 		pci_cfg_access_lock(sdev);
 	}
 	/* PCI link toggle */
-	err = pci_read_config_word(bridge, cap + PCI_EXP_LNKCTL, &reg16);
-	if (err)
-		return err;
-	reg16 |= PCI_EXP_LNKCTL_LD;
-	err = pci_write_config_word(bridge, cap + PCI_EXP_LNKCTL, reg16);
+	err = pcie_lnkctl_clear_and_set(bridge, 0, PCI_EXP_LNKCTL_LD);
 	if (err)
 		return err;
 	msleep(500);
-	reg16 &= ~PCI_EXP_LNKCTL_LD;
-	err = pci_write_config_word(bridge, cap + PCI_EXP_LNKCTL, reg16);
+	err = pcie_lnkctl_clear_and_set(bridge, PCI_EXP_LNKCTL_LD, 0);
 	if (err)
 		return err;