PCI: pciehp: return error on read/write failure

Current pciehp returns successfully on read/write failure with dummy
state values. It should return error instead.

With this patch, pciehp no longer uses hotplug_slot_info data
structure. So this also removes hotplug_slot_info related code. But
note that it still allocates hotplug_slot_info because it is required
by pci hotplug core.

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

3 files changed, 22 insertions, 92 deletions

diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 77feafd39e2..d19f87594df 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -135,15 +135,9 @@ static int init_slot(struct controller *ctrl)
                  ctrl->pcie->port->subordinate->number, PSN(ctrl));
         retval = pci_hp_register(hotplug,
                                  ctrl->pcie->port->subordinate, 0, name);
-        if (retval) {
+        if (retval)
                 ctrl_err(ctrl,
                          "pci_hp_register failed with error %d\n", retval);
-                goto out;
-        }
-        get_power_status(hotplug, &info->power_status);
-        get_attention_status(hotplug, &info->attention_status);
-        get_latch_status(hotplug, &info->latch_status);
-        get_adapter_status(hotplug, &info->adapter_status);
 out:
         if (retval) {
                 kfree(ops);
@@ -168,10 +162,7 @@ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                   __func__, slot_name(slot));
 
-        hotplug_slot->info->attention_status = status;
-        pciehp_set_attention_status(slot, status);
-
-        return 0;
+        return pciehp_set_attention_status(slot, status);
 }
 
 
@@ -199,92 +190,62 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                   __func__, slot_name(slot));
 
-        retval = pciehp_get_power_status(slot, value);
-        if (retval < 0)
-                *value = hotplug_slot->info->power_status;
-
-        return 0;
+        return pciehp_get_power_status(slot, value);
 }
 
 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                   __func__, slot_name(slot));
 
-        retval = pciehp_get_attention_status(slot, value);
-        if (retval < 0)
-                *value = hotplug_slot->info->attention_status;
-
-        return 0;
+        return pciehp_get_attention_status(slot, value);
 }
 
 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        retval = pciehp_get_latch_status(slot, value);
-        if (retval < 0)
-                *value = hotplug_slot->info->latch_status;
-
-        return 0;
+        return pciehp_get_latch_status(slot, value);
 }
 
 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        retval = pciehp_get_adapter_status(slot, value);
-        if (retval < 0)
-                *value = hotplug_slot->info->adapter_status;
-
-        return 0;
+        return pciehp_get_adapter_status(slot, value);
 }
 
 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
                                 enum pci_bus_speed *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        retval = pciehp_get_max_link_speed(slot, value);
-        if (retval < 0)
-                *value = PCI_SPEED_UNKNOWN;
-
-        return 0;
+        return pciehp_get_max_link_speed(slot, value);
 }
 
 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 {
         struct slot *slot = hotplug_slot->private;
-        int retval;
 
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        retval = pciehp_get_cur_link_speed(slot, value);
-        if (retval < 0)
-                *value = PCI_SPEED_UNKNOWN;
-
-        return 0;
+        return pciehp_get_cur_link_speed(slot, value);
 }
 
 static int pciehp_probe(struct pcie_device *dev)
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 84487d126e4..15ce2a3cc0f 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -363,25 +363,6 @@ void pciehp_queue_pushbutton_work(struct work_struct *work)
         mutex_unlock(&p_slot->lock);
 }
 
-static int update_slot_info(struct slot *slot)
-{
-        struct hotplug_slot_info *info;
-        int result;
-
-        info = kmalloc(sizeof(*info), GFP_KERNEL);
-        if (!info)
-                return -ENOMEM;
-
-        pciehp_get_power_status(slot, &info->power_status);
-        pciehp_get_attention_status(slot, &info->attention_status);
-        pciehp_get_latch_status(slot, &info->latch_status);
-        pciehp_get_adapter_status(slot, &info->adapter_status);
-
-        result = pci_hp_change_slot_info(slot->hotplug_slot, info);
-        kfree (info);
-        return result;
-}
-
 /*
  * Note: This function must be called with slot->lock held
  */
@@ -442,7 +423,6 @@ static void handle_button_press_event(struct slot *p_slot)
                  * to hot-add or hot-remove is undergoing
                  */
                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
-                update_slot_info(p_slot);
                 break;
         default:
                 ctrl_warn(ctrl, "Not a valid state\n");
@@ -500,11 +480,9 @@ static void interrupt_event_handler(struct work_struct *work)
                 if (!HP_SUPR_RM(ctrl))
                         break;
                 ctrl_dbg(ctrl, "Surprise Removal\n");
-                update_slot_info(p_slot);
                 handle_surprise_event(p_slot);
                 break;
         default:
-                update_slot_info(p_slot);
                 break;
         }
         mutex_unlock(&p_slot->lock);
@@ -547,9 +525,6 @@ int pciehp_enable_slot(struct slot *p_slot)
         if (rc) {
                 pciehp_get_latch_status(p_slot, &getstatus);
         }
-
-        update_slot_info(p_slot);
-
         return rc;
 }
 
@@ -590,10 +565,7 @@ int pciehp_disable_slot(struct slot *p_slot)
                 }
         }
 
-        ret = remove_board(p_slot);
-        update_slot_info(p_slot);
-
-        return ret;
+        return remove_board(p_slot);
 }
 
 int pciehp_sysfs_enable_slot(struct slot *p_slot)
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 88b654ec5af..7f35aff2236 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -427,27 +427,24 @@ int pciehp_set_attention_status(struct slot *slot, u8 value)
         struct controller *ctrl = slot->ctrl;
         u16 slot_cmd;
         u16 cmd_mask;
-        int rc;
 
         cmd_mask = PCI_EXP_SLTCTL_AIC;
         switch (value) {
-                case 0 :        /* turn off */
-                        slot_cmd = 0x00C0;
-                        break;
-                case 1:         /* turn on */
-                        slot_cmd = 0x0040;
-                        break;
-                case 2:         /* turn blink */
-                        slot_cmd = 0x0080;
-                        break;
-                default:
-                        return -1;
-        }
-        rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
+        case 0 :        /* turn off */
+                slot_cmd = 0x00C0;
+                break;
+        case 1:         /* turn on */
+                slot_cmd = 0x0040;
+                break;
+        case 2:         /* turn blink */
+                slot_cmd = 0x0080;
+                break;
+        default:
+                return -EINVAL;
+        }
         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
                  __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
-
-        return rc;
+        return pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 }
 
 void pciehp_green_led_on(struct slot *slot)