PCI: pciehp: Move Attention & Power Indicator support tests to accessors

Previously, the caller checked ATTN_LED() or PWR_LED() to see whether the
slot has indicators before setting the indicator state.  That clutters the
caller unnecessarily, so this moves the test inside the callees.  The test
may not even be necessary; per spec it should be harmless to try to turn on
a non-existent LED.  But checking first does avoid unnecessary hotplug
commands.

No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/hotplug/pciehp_ctrl.c

@@ -168,10 +168,7 @@ static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 		msleep(1000);
 	}
 
-	if (PWR_LED(ctrl))
 	pciehp_green_led_off(pslot);
-
-	if (ATTN_LED(ctrl))
 	pciehp_set_attention_status(pslot, 1);
 }
 
@@ -195,7 +192,6 @@ static int board_added(struct slot *p_slot)
 			return retval;
 	}
 
-	if (PWR_LED(ctrl))
 	pciehp_green_led_blink(p_slot);
 
 	/* Check link training status */
@@ -219,9 +215,7 @@ static int board_added(struct slot *p_slot)
 		goto err_exit;
 	}
 
-	if (PWR_LED(ctrl))
 	pciehp_green_led_on(p_slot);
-
 	return 0;
 
 err_exit:
@@ -254,9 +248,7 @@ static int remove_board(struct slot *p_slot)
 	}
 
 	/* turn off Green LED */
-	if (PWR_LED(ctrl))
 	pciehp_green_led_off(p_slot);
-
 	return 0;
 }
 
@@ -292,7 +284,7 @@ static void pciehp_power_thread(struct work_struct *work)
 		break;
 	case POWERON_STATE:
 		mutex_unlock(&p_slot->lock);
-		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
+		if (pciehp_enable_slot(p_slot))
 			pciehp_green_led_off(p_slot);
 		mutex_lock(&p_slot->lock);
 		p_slot->state = STATIC_STATE;
@@ -359,11 +351,8 @@ static void handle_button_press_event(struct slot *p_slot)
 				  "press.\n", slot_name(p_slot));
 		}
 		/* blink green LED and turn off amber */
-		if (PWR_LED(ctrl))
 		pciehp_green_led_blink(p_slot);
-		if (ATTN_LED(ctrl))
 		pciehp_set_attention_status(p_slot, 0);
-
 		queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
 		break;
 	case BLINKINGOFF_STATE:
@@ -376,13 +365,10 @@ static void handle_button_press_event(struct slot *p_slot)
 		ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 		cancel_delayed_work(&p_slot->work);
 		if (p_slot->state == BLINKINGOFF_STATE) {
-			if (PWR_LED(ctrl))
 			pciehp_green_led_on(p_slot);
 		} else {
-			if (PWR_LED(ctrl))
 			pciehp_green_led_off(p_slot);
 		}
-		if (ATTN_LED(ctrl))
 		pciehp_set_attention_status(p_slot, 0);
 		ctrl_info(ctrl, "PCI slot #%s - action canceled "
 			  "due to button press\n", slot_name(p_slot));
@@ -443,9 +429,7 @@ static void interrupt_event_handler(struct work_struct *work)
 	case INT_POWER_FAULT:
 		if (!POWER_CTRL(ctrl))
 			break;
-		if (ATTN_LED(ctrl))
 		pciehp_set_attention_status(p_slot, 1);
-		if (PWR_LED(ctrl))
 		pciehp_green_led_off(p_slot);
 		break;
 	case INT_PRESENCE_ON:

drivers/pci/hotplug/pciehp_hpc.c

@@ -418,6 +418,9 @@ void pciehp_set_attention_status(struct slot *slot, u8 value)
 	struct controller *ctrl = slot->ctrl;
 	u16 slot_cmd;
 
+	if (!ATTN_LED(ctrl))
+		return;
+
 	switch (value) {
 	case 0 :	/* turn off */
 		slot_cmd = PCI_EXP_SLTCTL_ATTN_IND_OFF;
@@ -440,6 +443,9 @@ void pciehp_green_led_on(struct slot *slot)
 {
 	struct controller *ctrl = slot->ctrl;
 
+	if (!PWR_LED(ctrl))
+		return;
+
 	pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON, PCI_EXP_SLTCTL_PIC);
 	ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 		 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
@@ -450,6 +456,9 @@ void pciehp_green_led_off(struct slot *slot)
 {
 	struct controller *ctrl = slot->ctrl;
 
+	if (!PWR_LED(ctrl))
+		return;
+
 	pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, PCI_EXP_SLTCTL_PIC);
 	ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 		 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,
@@ -460,6 +469,9 @@ void pciehp_green_led_blink(struct slot *slot)
 {
 	struct controller *ctrl = slot->ctrl;
 
+	if (!PWR_LED(ctrl))
+		return;
+
 	pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK, PCI_EXP_SLTCTL_PIC);
 	ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 		 pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL,