Merge branch 'pci/controller/switchtec'

- Return -EFAULT instead of unrelated codes for copy_to_user() errors
  (Bjorn Helgaas)

* pci/controller/switchtec:
  PCI: switchtec: Return -EFAULT for copy_to_user() errors
  PCI: switchtec: Simplify switchtec_dma_mrpc_isr()

Author: bjorn-helgaas

drivers/pci/switch/switchtec.c

@@ -606,21 +606,20 @@ static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
 	rc = copy_to_user(data, &stuser->return_code,
 			  sizeof(stuser->return_code));
 	if (rc) {
-		rc = -EFAULT;
-		goto out;
+		mutex_unlock(&stdev->mrpc_mutex);
+		return -EFAULT;
 	}
 
 	data += sizeof(stuser->return_code);
 	rc = copy_to_user(data, &stuser->data,
 			  size - sizeof(stuser->return_code));
 	if (rc) {
-		rc = -EFAULT;
-		goto out;
+		mutex_unlock(&stdev->mrpc_mutex);
+		return -EFAULT;
 	}
 
 	stuser_set_state(stuser, MRPC_IDLE);
 
-out:
 	mutex_unlock(&stdev->mrpc_mutex);
 
 	if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE ||
@@ -1480,15 +1479,13 @@ static irqreturn_t switchtec_event_isr(int irq, void *dev)
 static irqreturn_t switchtec_dma_mrpc_isr(int irq, void *dev)
 {
 	struct switchtec_dev *stdev = dev;
-	irqreturn_t ret = IRQ_NONE;
 
 	iowrite32(SWITCHTEC_EVENT_CLEAR |
 		  SWITCHTEC_EVENT_EN_IRQ,
 		  &stdev->mmio_part_cfg->mrpc_comp_hdr);
 	schedule_work(&stdev->mrpc_work);
 
-	ret = IRQ_HANDLED;
-	return ret;
+	return IRQ_HANDLED;
 }
 
 static int switchtec_init_isr(struct switchtec_dev *stdev)