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Vineeth Vijayan 6e7f06895d s390/cio: Update purge function to unregister the unused subchannels

commit 9daa5a8795 upstream.

Starting with 'commit 2297791c92 ("s390/cio: dont unregister
subchannel from child-drivers")', cio no longer unregisters
subchannels when the attached device is invalid or unavailable.

As an unintended side-effect, the cio_ignore purge function no longer
removes subchannels for devices on the cio_ignore list if no CCW device
is attached. This situation occurs when a CCW device is non-operational
or unavailable

To ensure the same outcome of the purge function as when the
current cio_ignore list had been active during boot, update the purge
function to remove I/O subchannels without working CCW devices if the
associated device number is found on the cio_ignore list.

Fixes: 2297791c92 ("s390/cio: dont unregister subchannel from child-drivers")
Suggested-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-10-29 14:03:13 +01:00

block

s390/dasd: fix error recovery leading to data corruption on ESE devices

2024-09-04 13:23:15 +02:00

char

s390/tty: Fix a potential memory leak bug

2025-05-02 07:44:34 +02:00

cio

s390/cio: Update purge function to unregister the unused subchannels

2025-10-29 14:03:13 +01:00

crypto

s390/pkey: Prevent overflow in size calculation for memdup_user()