s390/css: validate subchannel prior to allocation

Browse source

In css_alloc_subchannel we allocate the subchannel and do a
validation of the subchannel (to decide if we should look for
devices via this subchannel). On a typical LPAR we find lots
of subchannels to be invalid (because there is no device
attached or the device is blacklisted) leading to lots of
useless kmalloc and kfree calls.

This patch changes the order to only allocate the subchannels
that have been found valid.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

...

This commit is contained in:

Sebastian Ott 2018-06-25 11:23:26 +02:00 • committed by Martin Schwidefsky

parent 71aa11a40d

commit 05b217f4c5

3 changed files with 23 additions and 30 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

40

drivers/s390/cio/cio.c

View file

2

drivers/s390/cio/cio.h

View file

11

drivers/s390/cio/css.c

View file