Merge branch 'for-5.1/i2c-hid' into for-linus

Fix dmesg flood for Elan touchpanels which are too slow to assert IRQ from Kai-Heng Feng

drivers/hid/intel-ish-hid/ipc/ipc.c

@@ -259,33 +259,22 @@ static int write_ipc_from_queue(struct ishtp_device *dev)
 	int	i;
 	void	(*ipc_send_compl)(void *);
 	void	*ipc_send_compl_prm;
-	static int	out_ipc_locked;
-	unsigned long	out_ipc_flags;
 
 	if (dev->dev_state == ISHTP_DEV_DISABLED)
-		return	-EINVAL;
-
-	spin_lock_irqsave(&dev->out_ipc_spinlock, out_ipc_flags);
-	if (out_ipc_locked) {
-		spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags);
-		return -EBUSY;
-	}
-	out_ipc_locked = 1;
-	if (!ish_is_input_ready(dev)) {
-		out_ipc_locked = 0;
-		spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags);
-		return -EBUSY;
-	}
-	spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags);
+		return -EINVAL;
 
 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
+	if (!ish_is_input_ready(dev)) {
+		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
+		return -EBUSY;
+	}
+
 	/*
 	 * if tx send list is empty - return 0;
 	 * may happen, as RX_COMPLETE handler doesn't check list emptiness.
 	 */
 	if (list_empty(&dev->wr_processing_list)) {
 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
-		out_ipc_locked = 0;
 		return	0;
 	}
 
@@ -328,6 +317,8 @@ static int write_ipc_from_queue(struct ishtp_device *dev)
 		memcpy(&reg, &r_buf[length >> 2], rem);
 		ish_reg_write(dev, reg_addr, reg);
 	}
+	ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, doorbell_val);
+
 	/* Flush writes to msg registers and doorbell */
 	ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
 
@@ -335,9 +326,6 @@ static int write_ipc_from_queue(struct ishtp_device *dev)
 	++dev->ipc_tx_cnt;
 	dev->ipc_tx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);
 
-	ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, doorbell_val);
-	out_ipc_locked = 0;
-
 	ipc_send_compl = ipc_link->ipc_send_compl;
 	ipc_send_compl_prm = ipc_link->ipc_send_compl_prm;
 	list_del_init(&ipc_link->link);
@@ -917,7 +905,6 @@ struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
 	init_waitqueue_head(&dev->wait_hw_ready);
 
 	spin_lock_init(&dev->wr_processing_spinlock);
-	spin_lock_init(&dev->out_ipc_spinlock);
 
 	/* Init IPC processing and free lists */
 	INIT_LIST_HEAD(&dev->wr_processing_list);