3 files changed, 23 insertions, 12 deletions

diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h
index 7bc643f3f5ab..e5c966462c5a 100644
--- a/drivers/s390/cio/qdio.h
+++ b/drivers/s390/cio/qdio.h
@@ -14,6 +14,8 @@
 #include "chsc.h"
 
 #define QDIO_BUSY_BIT_PATIENCE		(100 << 12)	/* 100 microseconds */
+#define QDIO_BUSY_BIT_RETRY_DELAY	10		/* 10 milliseconds */
+#define QDIO_BUSY_BIT_RETRIES		1000		/* = 10s retry time */
 #define QDIO_INPUT_THRESHOLD		(500 << 12)	/* 500 microseconds */
 
 /*
diff --git a/drivers/s390/cio/qdio_debug.c b/drivers/s390/cio/qdio_debug.c
index f8b03a636e49..0e615cb912d0 100644
--- a/drivers/s390/cio/qdio_debug.c
+++ b/drivers/s390/cio/qdio_debug.c
@@ -188,19 +188,13 @@ static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
 	struct qdio_irq *irq_ptr = seq->private;
 	struct qdio_q *q;
 	unsigned long val;
-	char buf[8];
 	int ret, i;
 
 	if (!irq_ptr)
 		return 0;
-	if (count >= sizeof(buf))
-		return -EINVAL;
-	if (copy_from_user(&buf, ubuf, count))
-		return -EFAULT;
-	buf[count] = 0;
-
-	ret = strict_strtoul(buf, 10, &val);
-	if (ret < 0)
+
+	ret = kstrtoul_from_user(ubuf, count, 10, &val);
+	if (ret)
 		return ret;
 
 	switch (val) {
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index e58169c32474..288c9140290e 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -313,7 +313,7 @@ static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 	unsigned int fc = QDIO_SIGA_WRITE;
 	u64 start_time = 0;
-	int cc;
+	int retries = 0, cc;
 
 	if (is_qebsm(q)) {
 		schid = q->irq_ptr->sch_token;
@@ -325,6 +325,7 @@ again:
 	/* hipersocket busy condition */
 	if (unlikely(*busy_bit)) {
 		WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
+		retries++;
 
 		if (!start_time) {
 			start_time = get_clock();
@@ -333,6 +334,11 @@ again:
 		if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 			goto again;
 	}
+	if (retries) {
+		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
+			      "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
+		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
+	}
 	return cc;
 }
 
@@ -728,13 +734,14 @@ static inline int qdio_outbound_q_moved(struct qdio_q *q)
 
 static int qdio_kick_outbound_q(struct qdio_q *q)
 {
+	int retries = 0, cc;
 	unsigned int busy_bit;
-	int cc;
 
 	if (!need_siga_out(q))
 		return 0;
 
 	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
+retry:
 	qperf_inc(q, siga_write);
 
 	cc = qdio_siga_output(q, &busy_bit);
@@ -743,7 +750,11 @@ static int qdio_kick_outbound_q(struct qdio_q *q)
 		break;
 	case 2:
 		if (busy_bit) {
-			DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
+			while (++retries < QDIO_BUSY_BIT_RETRIES) {
+				mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
+				goto retry;
+			}
+			DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 			cc |= QDIO_ERROR_SIGA_BUSY;
 		} else
 			DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
@@ -753,6 +764,10 @@ static int qdio_kick_outbound_q(struct qdio_q *q)
 		DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 		break;
 	}
+	if (retries) {
+		DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
+		DBF_ERROR("count:%u", retries);
+	}
 	return cc;
 }