From: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Date: Mon, 23 Oct 2017 07:40:16 +0000 (+0200)
Subject: s390/qdio: consider ERROR buffers for inbound-full condition
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0b926ac304a9b315f0ce8ce2ae5373b5a0478b68;p=openwrt%2Fstaging%2Fblogic.git

s390/qdio: consider ERROR buffers for inbound-full condition

In the unlikely case that an ERROR buffer (presented by the HW)
consumed the last available slot on the input queue, increment the
corresponding statistics counter.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index 59b4a3370cd5..d681e6b56add 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -536,7 +536,8 @@ static int get_inbound_buffer_frontier(struct qdio_q *q)
 	case SLSB_P_INPUT_ERROR:
 		process_buffer_error(q, count);
 		q->first_to_check = add_buf(q->first_to_check, count);
-		atomic_sub(count, &q->nr_buf_used);
+		if (atomic_sub_return(count, &q->nr_buf_used) == 0)
+			qperf_inc(q, inbound_queue_full);
 		if (q->irq_ptr->perf_stat_enabled)
 			account_sbals_error(q, count);
 		break;