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/wireless/ath/ath11k/pci.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index 7b33731a50ee..d0885d30dcbc 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -581,8 +581,8 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
/* disable L0s and L1 */
- pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
- ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+ pcie_lnkctl_clear_and_set(ab_pci->pdev,
+ ab_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC, 0);
set_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags);
}
@@ -590,8 +590,8 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
static void ath11k_pci_aspm_restore(struct ath11k_pci *ab_pci)
{
if (test_and_clear_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags))
- pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
- ab_pci->link_ctl);
+ pcie_lnkctl_clear_and_set(ab_pci->pdev, 0,
+ ab_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC);
}
static int ath11k_pci_power_up(struct ath11k_base *ab)
--
2.30.2
