linux-kernel - [PATCH v2 5/8] PCI: pciehp: Don't re-read Slot Status when handling surprise event

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Date:   Mon, 12 Sep 2016 16:09:28 -0500
From:   Bjorn Helgaas <bhelgaas@...gle.com>
To:     Mayurkumar Patel <mayurkumar.patel@...el.com>
Cc:     Rajat Jain <rajatja@...gle.com>, MikaWesterberg@...ux.intel.com,
        linux-pci@...r.kernel.org,
        Rafael J Wysocki <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        Luis Antonio Tarazona-Duarte 
        <luis.antonio.tarazona-duarte@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        mika.westerberg@...ux.intel.com
Subject: [PATCH v2 5/8] PCI: pciehp: Don't re-read Slot Status when handling
 surprise event

From: Mayurkumar Patel <mayurkumar.patel@...el.com>

Previously we read Slot Status when handling a surprise event.  But Slot
Status might have changed since we identified the event, and the event_type
already tells us whether to enable or disable the slot, so there's no need
to read it again.

Remove handle_surprise_event() and queue the power work directly.

[bhelgaas: changelog]
Signed-off-by: Mayurkumar Patel <mayurkumar.patel@...el.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Rajat Jain <rajatxjain@...il.com>
---
 drivers/pci/hotplug/pciehp_ctrl.c |   18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 7ea3e61..a787684 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -302,20 +302,6 @@ static void handle_button_press_event(struct slot *p_slot)
 /*
  * Note: This function must be called with slot->lock held
  */
-static void handle_surprise_event(struct slot *p_slot)
-{
-	u8 getstatus;
-
-	pciehp_get_adapter_status(p_slot, &getstatus);
-	if (!getstatus)
-		pciehp_queue_power_work(p_slot, DISABLE_REQ);
-	else
-		pciehp_queue_power_work(p_slot, ENABLE_REQ);
-}
-
-/*
- * Note: This function must be called with slot->lock held
- */
 static void handle_link_event(struct slot *p_slot, u32 event)
 {
 	struct controller *ctrl = p_slot->ctrl;
@@ -378,14 +364,14 @@ static void interrupt_event_handler(struct work_struct *work)
 		pciehp_green_led_off(p_slot);
 		break;
 	case INT_PRESENCE_ON:
-		handle_surprise_event(p_slot);
+		pciehp_queue_power_work(p_slot, ENABLE_REQ);
 		break;
 	case INT_PRESENCE_OFF:
 		/*
 		 * Regardless of surprise capability, we need to
 		 * definitely remove a card that has been pulled out!
 		 */
-		handle_surprise_event(p_slot);
+		pciehp_queue_power_work(p_slot, DISABLE_REQ);
 		break;
 	case INT_LINK_UP:
 	case INT_LINK_DOWN: