PCI: pciehp: Make various functions void since they can't fail

These functions:

  pcie_enable_notification()
  pciehp_power_off_slot()
  pciehp_get_power_status()
  pciehp_get_attention_status()
  pciehp_set_attention_status()
  pciehp_get_latch_status()
  pciehp_get_adapter_status()
  pcie_write_cmd()

now always return success, so this patch makes them void and drops the
error-checking code in their callers.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

5 files changed, 54 insertions, 89 deletions

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 21e865ded1dc..ffe6a6b336cf 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -140,15 +140,15 @@ struct controller *pcie_init(struct pcie_device *dev);
 int pcie_init_notification(struct controller *ctrl);
 int pciehp_enable_slot(struct slot *p_slot);
 int pciehp_disable_slot(struct slot *p_slot);
-int pcie_enable_notification(struct controller *ctrl);
+void pcie_enable_notification(struct controller *ctrl);
 int pciehp_power_on_slot(struct slot *slot);
-int pciehp_power_off_slot(struct slot *slot);
-int pciehp_get_power_status(struct slot *slot, u8 *status);
-int pciehp_get_attention_status(struct slot *slot, u8 *status);
+void pciehp_power_off_slot(struct slot *slot);
+void pciehp_get_power_status(struct slot *slot, u8 *status);
+void pciehp_get_attention_status(struct slot *slot, u8 *status);
 
-int pciehp_set_attention_status(struct slot *slot, u8 status);
-int pciehp_get_latch_status(struct slot *slot, u8 *status);
-int pciehp_get_adapter_status(struct slot *slot, u8 *status);
+void pciehp_set_attention_status(struct slot *slot, u8 status);
+void pciehp_get_latch_status(struct slot *slot, u8 *status);
+void pciehp_get_adapter_status(struct slot *slot, u8 *status);
 int pciehp_query_power_fault(struct slot *slot);
 void pciehp_green_led_on(struct slot *slot);
 void pciehp_green_led_off(struct slot *slot);
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index bbd48bbe4e9b..143a389d81fa 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -160,7 +160,8 @@ 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));
 
-        return pciehp_set_attention_status(slot, status);
+        pciehp_set_attention_status(slot, status);
+        return 0;
 }
 
 
@@ -192,7 +193,8 @@ static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                   __func__, slot_name(slot));
 
-        return pciehp_get_power_status(slot, value);
+        pciehp_get_power_status(slot, value);
+        return 0;
 }
 
 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
@@ -202,7 +204,8 @@ static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                   __func__, slot_name(slot));
 
-        return pciehp_get_attention_status(slot, value);
+        pciehp_get_attention_status(slot, value);
+        return 0;
 }
 
 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
@@ -212,7 +215,8 @@ static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        return pciehp_get_latch_status(slot, value);
+        pciehp_get_latch_status(slot, value);
+        return 0;
 }
 
 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
@@ -222,7 +226,8 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
                  __func__, slot_name(slot));
 
-        return pciehp_get_adapter_status(slot, value);
+        pciehp_get_adapter_status(slot, value);
+        return 0;
 }
 
 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 38f018679175..6c730b161b33 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -158,11 +158,8 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 {
         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
         if (POWER_CTRL(ctrl)) {
-                if (pciehp_power_off_slot(pslot)) {
-                        ctrl_err(ctrl,
-                                 "Issue of Slot Power Off command failed\n");
-                        return;
-                }
+                pciehp_power_off_slot(pslot);
+
                 /*
                  * After turning power off, we must wait for at least 1 second
                  * before taking any action that relies on power having been
@@ -174,13 +171,8 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
         if (PWR_LED(ctrl))
                 pciehp_green_led_off(pslot);
 
-        if (ATTN_LED(ctrl)) {
-                if (pciehp_set_attention_status(pslot, 1)) {
-                        ctrl_err(ctrl,
-                                 "Issue of Set Attention Led command failed\n");
-                        return;
-                }
-        }
+        if (ATTN_LED(ctrl))
+                pciehp_set_attention_status(pslot, 1);
 }
 
 /**
@@ -243,7 +235,7 @@ err_exit:
  */
 static int remove_board(struct slot *p_slot)
 {
-        int retval = 0;
+        int retval;
         struct controller *ctrl = p_slot->ctrl;
 
         retval = pciehp_unconfigure_device(p_slot);
@@ -251,13 +243,8 @@ static int remove_board(struct slot *p_slot)
                 return retval;
 
         if (POWER_CTRL(ctrl)) {
-                /* power off slot */
-                retval = pciehp_power_off_slot(p_slot);
-                if (retval) {
-                        ctrl_err(ctrl,
-                                 "Issue of Slot Disable command failed\n");
-                        return retval;
-                }
+                pciehp_power_off_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
@@ -482,14 +469,14 @@ int pciehp_enable_slot(struct slot *p_slot)
         int rc;
         struct controller *ctrl = p_slot->ctrl;
 
-        rc = pciehp_get_adapter_status(p_slot, &getstatus);
-        if (rc || !getstatus) {
+        pciehp_get_adapter_status(p_slot, &getstatus);
+        if (!getstatus) {
                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
                 return -ENODEV;
         }
         if (MRL_SENS(p_slot->ctrl)) {
-                rc = pciehp_get_latch_status(p_slot, &getstatus);
-                if (rc || getstatus) {
+                pciehp_get_latch_status(p_slot, &getstatus);
+                if (getstatus) {
                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
                                   slot_name(p_slot));
                         return -ENODEV;
@@ -497,8 +484,8 @@ int pciehp_enable_slot(struct slot *p_slot)
         }
 
         if (POWER_CTRL(p_slot->ctrl)) {
-                rc = pciehp_get_power_status(p_slot, &getstatus);
-                if (rc || getstatus) {
+                pciehp_get_power_status(p_slot, &getstatus);
+                if (getstatus) {
                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
                                   slot_name(p_slot));
                         return -EINVAL;
@@ -518,15 +505,14 @@ int pciehp_enable_slot(struct slot *p_slot)
 int pciehp_disable_slot(struct slot *p_slot)
 {
         u8 getstatus = 0;
-        int ret = 0;
         struct controller *ctrl = p_slot->ctrl;
 
         if (!p_slot->ctrl)
                 return 1;
 
         if (!HP_SUPR_RM(p_slot->ctrl)) {
-                ret = pciehp_get_adapter_status(p_slot, &getstatus);
-                if (ret || !getstatus) {
+                pciehp_get_adapter_status(p_slot, &getstatus);
+                if (!getstatus) {
                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
                                   slot_name(p_slot));
                         return -ENODEV;
@@ -534,8 +520,8 @@ int pciehp_disable_slot(struct slot *p_slot)
         }
 
         if (MRL_SENS(p_slot->ctrl)) {
-                ret = pciehp_get_latch_status(p_slot, &getstatus);
-                if (ret || getstatus) {
+                pciehp_get_latch_status(p_slot, &getstatus);
+                if (getstatus) {
                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
                                   slot_name(p_slot));
                         return -ENODEV;
@@ -543,8 +529,8 @@ int pciehp_disable_slot(struct slot *p_slot)
         }
 
         if (POWER_CTRL(p_slot->ctrl)) {
-                ret = pciehp_get_power_status(p_slot, &getstatus);
-                if (ret || !getstatus) {
+                pciehp_get_power_status(p_slot, &getstatus);
+                if (!getstatus) {
                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
                                   slot_name(p_slot));
                         return -EINVAL;
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 6afdd2358227..83df74910f9a 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -153,7 +153,7 @@ static void pcie_wait_cmd(struct controller *ctrl, int poll)
  * @cmd:  command value written to slot control register
  * @mask: bitmask of slot control register to be modified
  */
-static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
+static void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
 {
         struct pci_dev *pdev = ctrl_dev(ctrl);
         u16 slot_status;
@@ -208,7 +208,6 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
                 pcie_wait_cmd(ctrl, poll);
         }
         mutex_unlock(&ctrl->ctrl_lock);
-        return 0;
 }
 
 static bool check_link_active(struct controller *ctrl)
@@ -342,7 +341,7 @@ static int pciehp_link_disable(struct controller *ctrl)
         return __pciehp_link_set(ctrl, false);
 }
 
-int pciehp_get_attention_status(struct slot *slot, u8 *status)
+void pciehp_get_attention_status(struct slot *slot, u8 *status)
 {
         struct controller *ctrl = slot->ctrl;
         struct pci_dev *pdev = ctrl_dev(ctrl);
@@ -372,11 +371,9 @@ int pciehp_get_attention_status(struct slot *slot, u8 *status)
                 *status = 0xFF;
                 break;
         }
-
-        return 0;
 }
 
-int pciehp_get_power_status(struct slot *slot, u8 *status)
+void pciehp_get_power_status(struct slot *slot, u8 *status)
 {
         struct controller *ctrl = slot->ctrl;
         struct pci_dev *pdev = ctrl_dev(ctrl);
@@ -400,28 +397,24 @@ int pciehp_get_power_status(struct slot *slot, u8 *status)
                 *status = 0xFF;
                 break;
         }
-
-        return 0;
 }
 
-int pciehp_get_latch_status(struct slot *slot, u8 *status)
+void pciehp_get_latch_status(struct slot *slot, u8 *status)
 {
         struct pci_dev *pdev = ctrl_dev(slot->ctrl);
         u16 slot_status;
 
         pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
         *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
-        return 0;
 }
 
-int pciehp_get_adapter_status(struct slot *slot, u8 *status)
+void pciehp_get_adapter_status(struct slot *slot, u8 *status)
 {
         struct pci_dev *pdev = ctrl_dev(slot->ctrl);
         u16 slot_status;
 
         pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
         *status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
-        return 0;
 }
 
 int pciehp_query_power_fault(struct slot *slot)
@@ -433,7 +426,7 @@ int pciehp_query_power_fault(struct slot *slot)
         return !!(slot_status & PCI_EXP_SLTSTA_PFD);
 }
 
-int pciehp_set_attention_status(struct slot *slot, u8 value)
+void pciehp_set_attention_status(struct slot *slot, u8 value)
 {
         struct controller *ctrl = slot->ctrl;
         u16 slot_cmd;
@@ -451,11 +444,11 @@ int pciehp_set_attention_status(struct slot *slot, u8 value)
                 slot_cmd = 0x0080;
                 break;
         default:
-                return -EINVAL;
+                return;
         }
         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
-        return pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
+        pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 }
 
 void pciehp_green_led_on(struct slot *slot)
@@ -515,11 +508,7 @@ int pciehp_power_on_slot(struct slot * slot)
 
         slot_cmd = POWER_ON;
         cmd_mask = PCI_EXP_SLTCTL_PCC;
-        retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
-        if (retval) {
-                ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
-                return retval;
-        }
+        pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 
@@ -530,12 +519,11 @@ int pciehp_power_on_slot(struct slot * slot)
         return retval;
 }
 
-int pciehp_power_off_slot(struct slot * slot)
+void pciehp_power_off_slot(struct slot * slot)
 {
         struct controller *ctrl = slot->ctrl;
         u16 slot_cmd;
         u16 cmd_mask;
-        int retval;
 
         /* Disable the link at first */
         pciehp_link_disable(ctrl);
@@ -547,14 +535,9 @@ int pciehp_power_off_slot(struct slot * slot)
 
         slot_cmd = POWER_OFF;
         cmd_mask = PCI_EXP_SLTCTL_PCC;
-        retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
-        if (retval) {
-                ctrl_err(ctrl, "Write command failed!\n");
-                return retval;
-        }
+        pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
-        return 0;
 }
 
 static irqreturn_t pcie_isr(int irq, void *dev_id)
@@ -617,7 +600,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-int pcie_enable_notification(struct controller *ctrl)
+void pcie_enable_notification(struct controller *ctrl)
 {
         u16 cmd, mask;
 
@@ -643,22 +626,18 @@ int pcie_enable_notification(struct controller *ctrl)
                 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
                 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
 
-        if (pcie_write_cmd(ctrl, cmd, mask)) {
-                ctrl_err(ctrl, "Cannot enable software notification\n");
-                return -1;
-        }
-        return 0;
+        pcie_write_cmd(ctrl, cmd, mask);
 }
 
 static void pcie_disable_notification(struct controller *ctrl)
 {
         u16 mask;
+
         mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
                 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
                 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
                 PCI_EXP_SLTCTL_DLLSCE);
-        if (pcie_write_cmd(ctrl, 0, mask))
-                ctrl_warn(ctrl, "Cannot disable software notification\n");
+        pcie_write_cmd(ctrl, 0, mask);
 }
 
 /*
@@ -698,10 +677,7 @@ int pcie_init_notification(struct controller *ctrl)
 {
         if (pciehp_request_irq(ctrl))
                 return -1;
-        if (pcie_enable_notification(ctrl)) {
-                pciehp_free_irq(ctrl);
-                return -1;
-        }
+        pcie_enable_notification(ctrl);
         ctrl->notification_enabled = 1;
         return 0;
 }
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index 0e0d0f7f63fd..198355112ee7 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -78,7 +78,7 @@ int pciehp_configure_device(struct slot *p_slot)
 
 int pciehp_unconfigure_device(struct slot *p_slot)
 {
-        int ret, rc = 0;
+        int rc = 0;
         u8 bctl = 0;
         u8 presence = 0;
         struct pci_dev *dev, *temp;
@@ -88,9 +88,7 @@ int pciehp_unconfigure_device(struct slot *p_slot)
 
         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
                  __func__, pci_domain_nr(parent), parent->number);
-        ret = pciehp_get_adapter_status(p_slot, &presence);
-        if (ret)
-                presence = 0;
+        pciehp_get_adapter_status(p_slot, &presence);
 
         /*
          * Stopping an SR-IOV PF device removes all the associated VFs,