diff options
| -rw-r--r-- | sys/kern/vfs_bio.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index a25c934..205e9b3 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -474,10 +474,12 @@ runningbufwakeup(struct buf *bp) { long space, bspace; - if (bp->b_runningbufspace == 0) - return; - space = atomic_fetchadd_long(&runningbufspace, -bp->b_runningbufspace); bspace = bp->b_runningbufspace; + if (bspace == 0) + return; + space = atomic_fetchadd_long(&runningbufspace, -bspace); + KASSERT(space >= bspace, ("runningbufspace underflow %ld %ld", + space, bspace)); bp->b_runningbufspace = 0; /* * Only acquire the lock and wakeup on the transition from exceeding |
