diff options
| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2023-07-17 15:04:55 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2023-08-10 11:13:34 -0500 |
| commit | 5f75f96c61039151c193775d776fde42477eace1 (patch) | |
| tree | 431e094ac1310580f2cebf7100ab276ed111d44b | |
| parent | fb0171a4c01b4825e36a5584eaa84291179c64ce (diff) | |
PCI: pciehp: Use RMW accessors for changing LNKCTL
As hotplug is not the only driver touching LNKCTL, use the RMW capability
accessor which handles concurrent changes correctly.
Suggested-by: Lukas Wunner <lukas@wunner.de>
Fixes: 7f822999e12a ("PCI: pciehp: Add Disable/enable link functions")
Link: https://lore.kernel.org/r/20230717120503.15276-4-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org>
| -rw-r--r-- | drivers/pci/hotplug/pciehp_hpc.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 8711325605f0..fd713abdfb9f 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -332,17 +332,11 @@ int pciehp_check_link_status(struct controller *ctrl) static int __pciehp_link_set(struct controller *ctrl, bool enable) { struct pci_dev *pdev = ctrl_dev(ctrl); - u16 lnk_ctrl; - pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &lnk_ctrl); + pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, + PCI_EXP_LNKCTL_LD, + enable ? 0 : PCI_EXP_LNKCTL_LD); - if (enable) - lnk_ctrl &= ~PCI_EXP_LNKCTL_LD; - else - lnk_ctrl |= PCI_EXP_LNKCTL_LD; - - pcie_capability_write_word(pdev, PCI_EXP_LNKCTL, lnk_ctrl); - ctrl_dbg(ctrl, "%s: lnk_ctrl = %x\n", __func__, lnk_ctrl); return 0; } |