Commit 6eff208f authored by Committed by Martin SchwidefskyBrowse files
[S390] cio: Fix I/O subchannel refcounting.
Subchannel refcounting was incorrect in some places, especially a refcount was missing when ccw_device_call_sch_unregister() was called and the refcount was not correctly switched after moving devices. Fix this by establishing the following rules: - The ccw_device obtains a reference on its parent subchannel when dev.parent is set and gives it up in its release function. This is needed because we need a parent reference for correct refcounting even before the ccw device is (if at all) registered. - When calling device_move(), obtain a reference on the new subchannel before moving the ccw device and give up the reference on the old parent after moving. This brings the refcount in line with the first rule. Signed-off-by: Cornelia Huck <email@example.com> Signed-off-by: Martin Schwidefsky <firstname.lastname@example.org>
Showing with 56 additions and 19 deletions