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Fix coverity defects: CID 150924

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CID 150924: Unchecked return value (CHECKED_RETURN)
- On taskq_dispatch failure the reference must be dropped and
  this entry can be safely skipped.  This case should be impossible
  in the existing implementation but should be handled regardless.
  
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: luozhengzheng <luo.zhengzheng@zte.com.cn>
Closes #5278
This commit is contained in:
luozhengzheng 2016-10-18 03:03:52 +08:00 committed by Brian Behlendorf
parent f8e87e205c
commit b60eac3d1a
1 changed files with 5 additions and 1 deletions
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6
module/zfs/arc.c
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@ -3472,7 +3472,11 @@ arc_prune_async(int64_t adjust)
refcount_add(&ap->p_refcnt, ap->p_pfunc);
ap->p_adjust = adjust;
taskq_dispatch(arc_prune_taskq, arc_prune_task, ap, TQ_SLEEP);
if (taskq_dispatch(arc_prune_taskq, arc_prune_task,
ap, TQ_SLEEP) == 0) {
refcount_remove(&ap->p_refcnt, ap->p_pfunc);
continue;
}
ARCSTAT_BUMP(arcstat_prune);
}
mutex_exit(&arc_prune_mtx);