s390/con3215: Add __must_hold() attribute to raw3215_make_room()

Add __must_hold() attribute to raw3215_make_room() in order to let
clang's context analysis know that "get_ccwdev_lock(raw->cdev)" 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/char/con3215.c:485:9: warning:
  expecting spinlock 'raw->cdev->ccwlock' to be held at start of each loop [-Wthread-safety-analysis]
  485 |         while (RAW3215_BUFFER_SIZE - raw->count < length) {

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

0 files changed, 0 insertions, 0 deletions