tree 50657d29de857267b5fe5cacc5b240d0275dc05c
parent 1150f25441a7dad818fa4366d01c45c2fef1cbe8
author Sebastian Ott <sebott@linux.vnet.ibm.com> 1354290539 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1354549438 -0500

s390/cio: fix pgid reserved check

The check to whom a device is reserved is done by checking the path
state of the affected channel paths. If it turns out that one path is
flagged as reserved by someone else the whole device is marked as such.

However the meaning of the RESVD_ELSE bit is that the addressed device
is reserved to a different pathgroup (and not reserved to a different
LPAR). If we do this test on a path which is currently not a member of
the pathgroup we could erroneously mark the device as reserved to
someone else.

To fix this collect the reserved state for all potential members of the
pathgroup and only mark the device as reserved if all of those potential
members have the RESVD_ELSE bit set.

Cc: stable@vger.kernel.org
Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>