PCI: pciehp: remove crit_sect mutex

The crit_sect mutex defined in struct controller is to serialize
hot-plug operations against multiple slots under the same bus. But,
since PCIe doesnstream port has only one slot at most, it is
meaningless and we don't need it.

Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

3 files changed, 0 insertions, 16 deletions

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 2509984d9611..720844e0389d 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -88,7 +88,6 @@ struct event_info {
 };
 
 struct controller {
-        struct mutex crit_sect;         /* critical section mutex */
         struct mutex ctrl_lock;         /* controller lock */
         struct pci_dev *pci_dev;
         struct pcie_device *pcie;       /* PCI Express port service */
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index beb081703fd8..b3c9ae580d91 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -519,13 +519,9 @@ int pciehp_enable_slot(struct slot *p_slot)
         int rc;
         struct controller *ctrl = p_slot->ctrl;
 
-        /* Check to see if (latch closed, card present, power off) */
-        mutex_lock(&p_slot->ctrl->crit_sect);
-
         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
         if (rc || !getstatus) {
                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
-                mutex_unlock(&p_slot->ctrl->crit_sect);
                 return -ENODEV;
         }
         if (MRL_SENS(p_slot->ctrl)) {
@@ -533,7 +529,6 @@ int pciehp_enable_slot(struct slot *p_slot)
                 if (rc || getstatus) {
                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
                                   slot_name(p_slot));
-                        mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -ENODEV;
                 }
         }
@@ -543,7 +538,6 @@ int pciehp_enable_slot(struct slot *p_slot)
                 if (rc || getstatus) {
                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
                                   slot_name(p_slot));
-                        mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -EINVAL;
                 }
         }
@@ -557,7 +551,6 @@ int pciehp_enable_slot(struct slot *p_slot)
 
         update_slot_info(p_slot);
 
-        mutex_unlock(&p_slot->ctrl->crit_sect);
         return rc;
 }
 
@@ -571,15 +564,11 @@ int pciehp_disable_slot(struct slot *p_slot)
         if (!p_slot->ctrl)
                 return 1;
 
-        /* Check to see if (latch closed, card present, power on) */
-        mutex_lock(&p_slot->ctrl->crit_sect);
-
         if (!HP_SUPR_RM(p_slot->ctrl)) {
                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
                 if (ret || !getstatus) {
                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
                                   slot_name(p_slot));
-                        mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -ENODEV;
                 }
         }
@@ -589,7 +578,6 @@ int pciehp_disable_slot(struct slot *p_slot)
                 if (ret || getstatus) {
                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
                                   slot_name(p_slot));
-                        mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -ENODEV;
                 }
         }
@@ -599,7 +587,6 @@ int pciehp_disable_slot(struct slot *p_slot)
                 if (ret || !getstatus) {
                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
                                   slot_name(p_slot));
-                        mutex_unlock(&p_slot->ctrl->crit_sect);
                         return -EINVAL;
                 }
         }
@@ -607,7 +594,6 @@ int pciehp_disable_slot(struct slot *p_slot)
         ret = remove_board(p_slot);
         update_slot_info(p_slot);
 
-        mutex_unlock(&p_slot->ctrl->crit_sect);
         return ret;
 }
 
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 7374029316ec..b1dcf9aa80bc 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -1017,7 +1017,6 @@ struct controller *pcie_init(struct pcie_device *dev)
 
         ctrl->slot_cap = slot_cap;
         ctrl->hpc_ops = &pciehp_hpc_ops;
-        mutex_init(&ctrl->crit_sect);
         mutex_init(&ctrl->ctrl_lock);
         init_waitqueue_head(&ctrl->queue);
         dbg_ctrl(ctrl);