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path: root/drivers/s390/cio/qdio_main.c
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Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
-rw-r--r--drivers/s390/cio/qdio_main.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 4be6e84b959..b2275c5000e 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -486,7 +486,8 @@ static int get_inbound_buffer_frontier(struct qdio_q *q)
case SLSB_P_INPUT_PRIMED:
inbound_primed(q, count);
q->first_to_check = add_buf(q->first_to_check, count);
- atomic_sub(count, &q->nr_buf_used);
+ if (atomic_sub(count, &q->nr_buf_used) == 0)
+ qdio_perf_stat_inc(&perf_stats.inbound_queue_full);
break;
case SLSB_P_INPUT_ERROR:
announce_buffer_error(q, count);