Return -EINVAL when trying to kick/kill a nonexistent domain watchdog

... to be more in-line with the NR_DOMAIN_WATCHDOG_TIMERS check at the
top of domain_watchdog(), and also to follow the
timer_(delete|settime)
POSIX API's EINVAL return value.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>

Also, replace EEXIST with ENOSPC when failing to allocate a new
domain watchdog.

Signed-off-by: Keir Fraser <keir@xen.org>

Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index e909eec39d..95150c3149 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -754,14 +754,14 @@ static long domain_watchdog(struct domain *d, uint32_t id, uint32_t timeout)
             break;
         }
         spin_unlock(&d->watchdog_lock);
-        return id == NR_DOMAIN_WATCHDOG_TIMERS ? -EEXIST : id + 1;
+        return id == NR_DOMAIN_WATCHDOG_TIMERS ? -ENOSPC : id + 1;
     }
 
     id -= 1;
     if ( !test_bit(id, &d->watchdog_inuse_map) )
     {
         spin_unlock(&d->watchdog_lock);
-        return -EEXIST;
+        return -EINVAL;
     }
 
     if ( timeout == 0 )