[PATCH 4/4] PCI/hotplug: Don't enabled HPIE in poll mode

Ilpo Järvinen
2025-03-13T14:24:31Z

PCIe hotplug can operate in poll mode without interrupt handlers using
a polling kthread only. The commit eb34da60edee ("PCI: pciehp: Disable
hotplug interrupt during suspend") failed to consider that and enables
HPIE (Hot-Plug Interrupt Enable) unconditionally when resuming the
Port.

Only set HPIE if non-poll mode is in use. This makes
pcie_enable_interrupt() match how pcie_enable_notification() already
handles HPIE.

Fixes: eb34da60edee ("PCI: pciehp: Disable hotplug interrupt during suspend")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
drivers/pci/hotplug/pciehp_hpc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 26150a6b48f4..7e1ed179c7f3 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -846,7 +846,9 @@ void pcie_enable_interrupt(struct controller *ctrl)
{
u16 mask;

- mask = PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_DLLSCE;
+ mask = PCI_EXP_SLTCTL_DLLSCE;
+ if (!pciehp_poll_mode)
+ mask |= PCI_EXP_SLTCTL_HPIE;
pcie_write_cmd(ctrl, mask, mask);
}

--
2.39.5