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@huawei.com --- 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);