On Wed, May 17, 2023 at 12:53 PM Ilpo Järvinen ilpo.jarvinen@linux.intel.com wrote:
As hotplug is not the only driver touching LNKCTL, use the RMW capability accessor which handles concurrent changes correctly.
Fixes: 7f822999e12a ("PCI: pciehp: Add Disable/enable link functions") Suggested-by: Lukas Wunner lukas@wunner.de Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Cc: stable@vger.kernel.org
Acked-by: Rafael J. Wysocki rafael@kernel.org
drivers/pci/hotplug/pciehp_hpc.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index f8c70115b691..26623e2884a3 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 ? PCI_EXP_LNKCTL_LD : 0);
if (enable)lnk_ctrl &= ~PCI_EXP_LNKCTL_LD;elselnk_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;}
-- 2.30.2