mei: use non cached hcsr for interrupt enablement

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/hw-me.c

@@ -106,8 +106,9 @@ void mei_hcsr_set(struct mei_device *dev)
  */
 void mei_clear_interrupts(struct mei_device *dev)
 {
-	if ((dev->host_hw_state & H_IS) == H_IS)
-		mei_reg_write(dev, H_CSR, dev->host_hw_state);
+	u32 hcsr = mei_hcsr_read(dev);
+	if ((hcsr & H_IS) == H_IS)
+		mei_reg_write(dev, H_CSR, hcsr);
 }
 
 /**
@@ -117,8 +118,10 @@ void mei_clear_interrupts(struct mei_device *dev)
  */
 void mei_enable_interrupts(struct mei_device *dev)
 {
-	dev->host_hw_state |= H_IE;
-	mei_hcsr_set(dev);
+	u32 hcsr = mei_hcsr_read(dev);
+	hcsr |= H_IE;
+	hcsr &= ~H_IS;
+	mei_reg_write(dev, H_CSR, hcsr);
 }
 
 /**
@@ -128,8 +131,10 @@ void mei_enable_interrupts(struct mei_device *dev)
  */
 void mei_disable_interrupts(struct mei_device *dev)
 {
-	dev->host_hw_state &= ~H_IE;
-	mei_hcsr_set(dev);
+	u32 hcsr = mei_hcsr_read(dev);
+	hcsr  &= ~H_IE;
+	hcsr &= ~H_IS;
+	mei_reg_write(dev, H_CSR, hcsr);
 }
 
 /**

drivers/misc/mei/interrupt.c

@@ -691,7 +691,6 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
 	/* initialize our complete list */
 	mutex_lock(&dev->device_lock);
 	mei_io_list_init(&complete_list);
-	dev->host_hw_state = mei_hcsr_read(dev);
 
 	/* Ack the interrupt here
 	 * In case of MSI we don't go through the quick handler */
@@ -710,6 +709,7 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
 		return IRQ_HANDLED;
 	}
 
+	dev->host_hw_state = mei_hcsr_read(dev);
 	/*  check if we need to start the dev */
 	if ((dev->host_hw_state & H_RDY) == 0) {
 		if ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA) {

drivers/misc/mei/main.c

@@ -915,8 +915,6 @@ static int mei_probe(struct pci_dev *pdev,
 	return 0;
 
 release_irq:
-	/* disable interrupts */
-	dev->host_hw_state = mei_hcsr_read(dev);
 	mei_disable_interrupts(dev);
 	flush_scheduled_work();
 	free_irq(pdev->irq, dev);