PCI: hotplug: pciehp: wait for 1 second after power off slot

According to the 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.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 7f22caa70178..98e541ffef3d 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -197,6 +197,12 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
                             __FUNCTION__);
                         return;
                 }
+                /*
+                 * 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);
         }
 }
 
@@ -615,6 +621,12 @@ int pciehp_disable_slot(struct slot *p_slot)
                         mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -EINVAL;
                 }
+                /*
+                 * 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);
         }
 
         ret = remove_board(p_slot);