From fc836f0a8534542673f50682cfe6e02ebbec0be6 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Fri, 15 May 2020 17:58:01 +0200 Subject: [PATCH] spi: Fix controller unregister order commit 84855678add8aba927faf76bc2f130a40f94b6f7 upstream. When an SPI controller unregisters, it unbinds all its slave devices. For this, their drivers may need to access the SPI bus, e.g. to quiesce interrupts. However since commit ffbbdd21329f ("spi: create a message queueing infrastructure"), spi_destroy_queue() is executed before unbinding the slaves. It sets ctlr->running = false, thereby preventing SPI bus access and causing unbinding of slave devices to fail. Fix by unbinding slaves before calling spi_destroy_queue(). Fixes: ffbbdd21329f ("spi: create a message queueing infrastructure") Signed-off-by: Lukas Wunner Cc: stable@vger.kernel.org # v3.4+ Cc: Linus Walleij Link: https://lore.kernel.org/r/8aaf9d44c153fe233b17bc2dec4eb679898d7e7b.1589557526.git.lukas@wunner.de Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 755221bc3745c..1fc29a665a4a5 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2768,6 +2768,8 @@ void spi_unregister_controller(struct spi_controller *ctlr) struct spi_controller *found; int id = ctlr->bus_num; + device_for_each_child(&ctlr->dev, NULL, __unregister); + /* First make sure that this controller was ever added */ mutex_lock(&board_lock); found = idr_find(&spi_master_idr, id); @@ -2780,7 +2782,6 @@ void spi_unregister_controller(struct spi_controller *ctlr) list_del(&ctlr->list); mutex_unlock(&board_lock); - device_for_each_child(&ctlr->dev, NULL, __unregister); device_unregister(&ctlr->dev); /* free bus id */ mutex_lock(&board_lock); -- 2.47.2