pciehp: move msleep after power off

According to the PCI Express specification, we must wait for at least
1 second after turning power off before taking any action that relies
on power having been removed from the slot/adapter. For this, current
pciehp wait for 1 second after issuing the power off command in
hpc_power_off_slot() function. But waiting for 1 second in
hpc_power_off_slot() can make pciehp probing slow-down because pciehp
probe code calls hpc_power_off_slot() if the slot is not occupied just
in case. We don't need to wait for 1 second at the pciehp probe time
because there is no action on that empty slot. So move 1 second wait
from hpc_power_off_slot() to the caller of hpc_power_off_slot().

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 7ad8a7d..96a5d55 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -174,6 +174,13 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 		}
 	}
 
+	/*
+	 * After turning power off, we must wait for at least 1 second
+	 * before taking any action that relies on power having been
+	 * removed from the slot/adapter.
+	 */
+	msleep(1000);
+
 	if (PWR_LED(ctrl))
 		pslot->hpc_ops->green_led_off(pslot);
 
@@ -277,6 +284,13 @@ static int remove_board(struct slot *p_slot)
 		}
 	}
 
+	/*
+	 * After turning power off, we must wait for at least 1 second
+	 * before taking any action that relies on power having been
+	 * removed from the slot/adapter.
+	 */
+	msleep(1000);
+
 	if (PWR_LED(ctrl))
 		/* turn off Green LED */
 		p_slot->hpc_ops->green_led_off(p_slot);