[PATCH 13/17] net/tg3: Use pcie_lnkctl_clear_and_set() for changing LNKCTL

[Ilpo Järvinen]

Don't assume that only the driver would be accessing LNKCTL. 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@xxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/broadcom/tg3.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 58747292521d..f3b30e7af25d 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -4027,8 +4027,7 @@ static int tg3_power_down_prepare(struct tg3 *tp)
 
 	/* Restore the CLKREQ setting. */
 	if (tg3_flag(tp, CLKREQ_BUG))
-		pcie_capability_set_word(tp->pdev, PCI_EXP_LNKCTL,
-					 PCI_EXP_LNKCTL_CLKREQ_EN);
+		pcie_lnkctl_clear_and_set(tp->pdev, 0, PCI_EXP_LNKCTL_CLKREQ_EN);
 
 	misc_host_ctrl = tr32(TG3PCI_MISC_HOST_CTRL);
 	tw32(TG3PCI_MISC_HOST_CTRL,
@@ -5069,13 +5068,14 @@ static int tg3_setup_copper_phy(struct tg3 *tp, bool force_reset)
 
 	/* Prevent send BD corruption. */
 	if (tg3_flag(tp, CLKREQ_BUG)) {
+		u16 clkreq = 0;
+
 		if (tp->link_config.active_speed == SPEED_100 ||
 		    tp->link_config.active_speed == SPEED_10)
-			pcie_capability_clear_word(tp->pdev, PCI_EXP_LNKCTL,
-						   PCI_EXP_LNKCTL_CLKREQ_EN);
-		else
-			pcie_capability_set_word(tp->pdev, PCI_EXP_LNKCTL,
-						 PCI_EXP_LNKCTL_CLKREQ_EN);
+			clkreq = PCI_EXP_LNKCTL_CLKREQ_EN;
+
+		pcie_lnkctl_clear_and_set(tp->pdev, PCI_EXP_LNKCTL_CLKREQ_EN,
+					  clkreq);
 	}
 
 	tg3_test_and_report_link_chg(tp, current_link_up);
-- 
2.30.2