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>

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 7ad8a7d..96a5d55 100644 (file)
--- 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);

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index eb631af..79f1049 100644 (file)
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -754,13 +754,6 @@ static int hpc_power_off_slot(struct slot * slot)
        }
        dbg("%s: SLOTCTRL %x write cmd %x\n",
            __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
-
-       /*
-        * 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);
  out:
        if (changed)
                pcie_unmask_bad_dllp(ctrl);