s390/vfio_ccw: Add __must_hold() attribute to vfio_ccw_sch_quiesce()

Add __must_hold() attribute to vfio_ccw_sch_quiesce() in order to let
clang's context analysis know that sch->lock must be held on function
entry. This can also be easily verified when inspecting the function.

Without this annotation this leads to a valid warning when context
analysis is enabled:

drivers/s390/cio/vfio_ccw_drv.c:55:9: warning:
  expecting spinlock 'sch->lock' to be held at start of each loop [-Wthread-safety-analysis]
   55 |                 ret = cio_cancel_halt_clear(sch, &iretry);
      |                       ^

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

0 files changed, 0 insertions, 0 deletions