5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ilpo Järvinen ilpo.jarvinen@linux.intel.com
[ Upstream commit 527664f738afb6f2c58022cd35e63801e5dc7aec ]
PCIe hotplug can operate in poll mode without interrupt handlers using a polling kthread only. 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.
Link: https://lore.kernel.org/r/20250321162114.3939-1-ilpo.jarvinen@linux.intel.co... Fixes: eb34da60edee ("PCI: pciehp: Disable hotplug interrupt during suspend") Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Lukas Wunner lukas@wunner.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 bdbe01d4d9e90..c3512a0e5b14c 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -765,7 +765,9 @@ 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); }