diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 8264a768043..920091c4b18 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -146,10 +146,10 @@ struct controller {
 
 extern int pciehp_sysfs_enable_slot(struct slot *slot);
 extern int pciehp_sysfs_disable_slot(struct slot *slot);
-extern u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl);
-extern u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl);
-extern u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl);
-extern u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl);
+extern u8 pciehp_handle_attention_button(struct slot *p_slot);
+  extern u8 pciehp_handle_switch_change(struct slot *p_slot);
+extern u8 pciehp_handle_presence_change(struct slot *p_slot);
+extern u8 pciehp_handle_power_fault(struct slot *p_slot);
 extern int pciehp_configure_device(struct slot *p_slot);
 extern int pciehp_unconfigure_device(struct slot *p_slot);
 extern void pciehp_queue_pushbutton_work(struct work_struct *work);
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 0a7aa628e95..7ad8a7dbc1a 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -55,16 +55,13 @@ static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
 	return 0;
 }
 
-u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
+u8 pciehp_handle_attention_button(struct slot *p_slot)
 {
-	struct slot *p_slot;
 	u32 event_type;
 
 	/* Attention Button Change */
 	dbg("pciehp:  Attention button interrupt received.\n");
 
-	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
-
 	/*
 	 *  Button pressed - See if need to TAKE ACTION!!!
 	 */
@@ -76,18 +73,15 @@ u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
 	return 0;
 }
 
-u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
+u8 pciehp_handle_switch_change(struct slot *p_slot)
 {
-	struct slot *p_slot;
 	u8 getstatus;
 	u32 event_type;
 
 	/* Switch Change */
 	dbg("pciehp:  Switch interrupt received.\n");
 
-	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
-
 	if (getstatus) {
 		/*
 		 * Switch opened
@@ -107,17 +101,14 @@ u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
 	return 1;
 }
 
-u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
+u8 pciehp_handle_presence_change(struct slot *p_slot)
 {
-	struct slot *p_slot;
 	u32 event_type;
 	u8 presence_save;
 
 	/* Presence Change */
 	dbg("pciehp:  Presence/Notify input change.\n");
 
-	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
-
 	/* Switch is open, assume a presence change
 	 * Save the presence state
 	 */
@@ -141,16 +132,13 @@ u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 	return 1;
 }
 
-u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
+u8 pciehp_handle_power_fault(struct slot *p_slot)
 {
-	struct slot *p_slot;
 	u32 event_type;
 
 	/* power fault */
 	dbg("pciehp:  Power fault interrupt received.\n");
 
-	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
-
 	if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 		/*
 		 * power fault Cleared
@@ -163,7 +151,7 @@ u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 		 */
 		info("Power fault on Slot(%s)\n", p_slot->name);
 		event_type = INT_POWER_FAULT;
-		info("power fault bit %x set\n", hp_slot);
+		info("power fault bit %x set\n", 0);
 	}
 
 	queue_interrupt_event(p_slot, event_type);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 891f81a0400..425a0f60997 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -722,6 +722,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
 {
 	struct controller *ctrl = (struct controller *)dev_id;
 	u16 detected, intr_loc;
+	struct slot *p_slot;
 
 	/*
 	 * In order to guarantee that all interrupt events are
@@ -756,21 +757,38 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
 		wake_up_interruptible(&ctrl->queue);
 	}
 
+	if (!(intr_loc & ~CMD_COMPLETED))
+		return IRQ_HANDLED;
+
+	/*
+	 * Return without handling events if this handler routine is
+	 * called before controller initialization is done. This may
+	 * happen if hotplug event or another interrupt that shares
+	 * the IRQ with pciehp arrives before slot initialization is
+	 * done after interrupt handler is registered.
+	 *
+	 * FIXME - Need more structural fixes. We need to be ready to
+	 * handle the event before installing interrupt handler.
+	 */
+	p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
+	if (!p_slot || !p_slot->hpc_ops)
+		return IRQ_HANDLED;
+
 	/* Check MRL Sensor Changed */
 	if (intr_loc & MRL_SENS_CHANGED)
-		pciehp_handle_switch_change(0, ctrl);
+		pciehp_handle_switch_change(p_slot);
 
 	/* Check Attention Button Pressed */
 	if (intr_loc & ATTN_BUTTN_PRESSED)
-		pciehp_handle_attention_button(0, ctrl);
+		pciehp_handle_attention_button(p_slot);
 
 	/* Check Presence Detect Changed */
 	if (intr_loc & PRSN_DETECT_CHANGED)
-		pciehp_handle_presence_change(0, ctrl);
+		pciehp_handle_presence_change(p_slot);
 
 	/* Check Power Fault Detected */
 	if (intr_loc & PWR_FAULT_DETECTED)
-		pciehp_handle_power_fault(0, ctrl);
+		pciehp_handle_power_fault(p_slot);
 
 	return IRQ_HANDLED;
 }
@@ -1028,6 +1046,12 @@ static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
 static int pcie_init_hardware_part1(struct controller *ctrl,
 				    struct pcie_device *dev)
 {
+	/* Clear all remaining event bits in Slot Status register */
+	if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
+		err("%s: Cannot write to SLOTSTATUS register\n", __func__);
+		return -1;
+	}
+
 	/* Mask Hot-plug Interrupt Enable */
 	if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
 		err("%s: Cannot mask hotplug interrupt enable\n", __func__);
@@ -1040,16 +1064,6 @@ int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
 {
 	u16 cmd, mask;
 
-	/*
-	 * We need to clear all events before enabling hotplug interrupt
-	 * notification mechanism in order for hotplug controler to
-	 * generate interrupts.
-	 */
-	if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
-		err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
-		return -1;
-	}
-
 	cmd = PRSN_DETECT_ENABLE;
 	if (ATTN_BUTTN(ctrl))
 		cmd |= ATTN_BUTTN_ENABLE;