This is a note to let you know that I've just added the patch titled s390/cio: remove invalid condition on IO_SCH_UNREG to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: s390-cio-remove-invalid-condition-on-io_sch_unreg.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2f7484fd73729f89085fe08d683f5a8d9e17fe99 Mon Sep 17 00:00:00 2001 From: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx> Date: Fri, 23 Apr 2021 12:08:43 +0200 Subject: s390/cio: remove invalid condition on IO_SCH_UNREG From: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx> commit 2f7484fd73729f89085fe08d683f5a8d9e17fe99 upstream. The condition to check the cdev pointer validity on css_sch_device_unregister() is a leftover from the 'commit 8cc0dcfdc1c0 ("s390/cio: remove pm support from ccw bus driver")'. This could lead to a situation, where detaching the device is not happening completely. Remove this invalid condition in the IO_SCH_UNREG case. Link: https://lore.kernel.org/r/20210423100843.2230969-1-vneethv@xxxxxxxxxxxxx Fixes: 8cc0dcfdc1c0 ("s390/cio: remove pm support from ccw bus driver") Reported-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx> Suggested-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx> Tested-by: Julian Wiedmann <jwi@xxxxxxxxxxxxx> Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx> Tested-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/s390/cio/device.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -1525,8 +1525,7 @@ static int io_subchannel_sch_event(struc switch (action) { case IO_SCH_ORPH_UNREG: case IO_SCH_UNREG: - if (!cdev) - css_sch_device_unregister(sch); + css_sch_device_unregister(sch); break; case IO_SCH_ORPH_ATTACH: case IO_SCH_UNREG_ATTACH: Patches currently in stable-queue which might be from vneethv@xxxxxxxxxxxxx are queue-5.11/s390-cio-remove-invalid-condition-on-io_sch_unreg.patch