[PATCHv2 15/20] PCI/pciehp: Fix powerfault detection order

[Keith Busch <keith.busch@intel.com>]

A device add in a power controller controlled slot will power on and
clear power fault slot events, but this was happening before the interrupt
handler attempted to set the sticky status and attention indicators. The
wrong status will be set if a hot-add and power fault are handled in
one interrupt. This patch fixes that by checking for power faults before
checking for new devices.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/pci/hotplug/pciehp_hpc.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 9eb28a06cac6..52a18a7ec2a2 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -630,6 +630,14 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
 		pciehp_handle_button_press(slot);
 	}
 
+	/* Check Power Fault Detected */
+	if ((events & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
+		ctrl->power_fault_detected = 1;
+		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(slot));
+		pciehp_set_attention_status(slot, 1);
+		pciehp_green_led_off(slot);
+	}
+
 	/*
 	 * Disable requests have higher priority than Presence Detect Changed
 	 * or Data Link Layer State Changed events.
@@ -641,14 +649,6 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
 		pciehp_handle_presence_or_link_change(slot, events);
 	up_read(&ctrl->reset_lock);
 
-	/* Check Power Fault Detected */
-	if ((events & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
-		ctrl->power_fault_detected = 1;
-		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(slot));
-		pciehp_set_attention_status(slot, 1);
-		pciehp_green_led_off(slot);
-	}
-
 	pci_config_pm_runtime_put(pdev);
 	wake_up(&ctrl->requester);
 	return IRQ_HANDLED;
-- 
2.14.4