On Tue, May 04, 2021 at 05:10:42PM +0200, Vineeth Vijayan wrote:

quoted

For the css bus, we need locking for the event callbacks; for irq, this
may interact with the subchannel lock and likely needs some care.

I also looked at the other busses in the common I/O layer: scm looks
good at a glance, ccwgroup and ccw have locking for online/offline; the
other callbacks for the ccw drivers probably need to take the device
lock as well.

Common I/O layer maintainers, does that look right?

I just had a quick glance on the CIO layer drivers. And at first look, you 
are right.
It looks likewe need modifications in the event callbacks (referring css 
here)
Let me go thoughthis thoroughly and update.

Did this go anywhere?