[PATCH 4.4.y] spi: unbinding slave before calling spi_destroy_queue

[yangerkun <yangerkun@xxxxxxxxxx>]

We make a mistake while backport 'commit 84855678add8 ("spi: Fix
controller unregister order")'. What we should do is call __unreigster
for each device before spi_destroy_queue. This problem exist in
linux-4.4.y/linux-4.9.y.

Signed-off-by: yangerkun <yangerkun@xxxxxxxxxx>
---
 drivers/spi/spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index fe03771da5124..18031b755c376 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1957,13 +1957,13 @@ static int __unregister(struct device *dev, void *null)
  */
 void spi_unregister_master(struct spi_master *master)
 {
+	device_for_each_child(&master->dev, NULL, __unregister);
+
 	if (master->queued) {
 		if (spi_destroy_queue(master))
 			dev_err(&master->dev, "queue remove failed\n");
 	}
 
-	device_for_each_child(&master->dev, NULL, __unregister);
-
 	mutex_lock(&board_lock);
 	list_del(&master->list);
 	mutex_unlock(&board_lock);
-- 
2.25.4