On Mon, Jun 15, 2020 at 05:20:44PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 84855678add8aba927faf76bc2f130a40f94b6f7 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@xxxxxxxxx>
Date: Fri, 15 May 2020 17:58:01 +0200
Subject: [PATCH] spi: Fix controller unregister order
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 <lukas@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.4+
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Link: https://lore.kernel.org/r/8aaf9d44c153fe233b17bc2dec4eb679898d7e7b.1589557526.git.lukas@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
I've also grabbed:
ebc37af5e0a1 ("spi: No need to assign dummy value in spi_unregister_controller()")
And again worked around not having:
8caab75fd2c2 ("spi: Generalize SPI "master" to "controller"")
And queued these two patches for 4.19, 4.14, 4.9, and 4.4.
--
Thanks,
Sasha
