diff options
Diffstat (limited to 'drivers/s390/char/raw3270.c')
| -rw-r--r-- | drivers/s390/char/raw3270.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c index dfde0d941c3c..4e2b3a1a3b2e 100644 --- a/drivers/s390/char/raw3270.c +++ b/drivers/s390/char/raw3270.c @@ -831,6 +831,21 @@ raw3270_create_device(struct ccw_device *cdev) } /* + * This helper just validates that it is safe to activate a + * view in the panic() context, due to locking restrictions. + */ +int raw3270_view_lock_unavailable(struct raw3270_view *view) +{ + struct raw3270 *rp = view->dev; + + if (!rp) + return -ENODEV; + if (spin_is_locked(get_ccwdev_lock(rp->cdev))) + return -EBUSY; + return 0; +} + +/* * Activate a view. */ int |