| Message ID | 20230620134624.99688-11-ilpo.jarvinen@linux.intel.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | PCI: Improve PCIe Capability RMW concurrency control | expand |
On Tue, Jun 20, 2023 at 04:46:24PM +0300, Ilpo Järvinen wrote: > 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 RMW capability accessors which does proper locking to avoid losing > concurrent updates to the register value. On restore, clear the ASPMC > field properly. > > Fixes: 76d870ed09ab ("ath10k: enable ASPM") > Suggested-by: Lukas Wunner <lukas@wunner.de> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> > Acked-by: Kalle Valo <kvalo@kernel.org> > Cc: stable@vger.kernel.org > --- > drivers/net/wireless/ath/ath10k/pci.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) Reviewed-by: Simon Horman <simon.horman@corigine.com>
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c index a7f44f6335fb..9275a672f90c 100644 --- a/drivers/net/wireless/ath/ath10k/pci.c +++ b/drivers/net/wireless/ath/ath10k/pci.c @@ -1963,8 +1963,9 @@ static int ath10k_pci_hif_start(struct ath10k *ar) ath10k_pci_irq_enable(ar); ath10k_pci_rx_post(ar); - pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL, - ar_pci->link_ctl); + pcie_capability_clear_and_set_word(ar_pci->pdev, PCI_EXP_LNKCTL, + PCI_EXP_LNKCTL_ASPMC, + ar_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC); return 0; } @@ -2821,8 +2822,8 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar, pcie_capability_read_word(ar_pci->pdev, PCI_EXP_LNKCTL, &ar_pci->link_ctl); - pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL, - ar_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC); + pcie_capability_clear_word(ar_pci->pdev, PCI_EXP_LNKCTL, + PCI_EXP_LNKCTL_ASPMC); /* * Bring the target up cleanly.
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 RMW capability accessors which does proper locking to avoid losing concurrent updates to the register value. On restore, clear the ASPMC field properly. Fixes: 76d870ed09ab ("ath10k: enable ASPM") Suggested-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Acked-by: Kalle Valo <kvalo@kernel.org> Cc: stable@vger.kernel.org --- drivers/net/wireless/ath/ath10k/pci.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)