This is a note to let you know that I've just added the patch titled
wifi: ath10k: Use RMW accessors for changing LNKCTL
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-ath10k-use-rmw-accessors-for-changing-lnkctl.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d890a8ae851c779c5310bc2c79fc975adbc13b0e
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Mon Jul 17 15:05:02 2023 +0300
wifi: ath10k: Use RMW accessors for changing LNKCTL
[ Upstream commit f139492a09f15254fa261245cdbd65555cdf39e3 ]
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.
Suggested-by: Lukas Wunner <lukas@xxxxxxxxx>
Fixes: 76d870ed09ab ("ath10k: enable ASPM")
Link: https://lore.kernel.org/r/20230717120503.15276-11-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Acked-by: Kalle Valo <kvalo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index 85a30c301dad7..3a62f66973137 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.
