[PATCH] s390: V=V qdio fixes

Using FCP devices with V=V support, the input queue stalled when CCQ 97 had
been returned in qdio_do_eqbs.  When this happen we have to reissue the eqbs
instruction.

Another bug was when V=V was enabled we checked if hardware has SIGA-sync
support.  If not we returned with 0 from tiqdio_is_inbound_q_done.  Thus qdio
lost initiative on FCP devices and input queue stalled.  Running devices in
V=V there is no SIGA-sync support but nevertheless we have to process
tiqdio_is_inbound_q_done either.

Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 45ce032772f..9ed37dc9a1b 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -165,8 +165,13 @@ qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
         q_no = q->q_no;
         if(!q->is_input_q)
                 q_no += irq->no_input_qs;
+again:
         ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt);
         rc = qdio_check_ccq(q, ccq);
+        if (rc == 1) {
+                QDIO_DBF_TEXT5(1,trace,"eqAGAIN");
+                goto again;
+        }
         if (rc < 0) {
                 QDIO_DBF_TEXT2(1,trace,"eqberr");
                 sprintf(dbf_text,"%2x,%2x,%d,%d",tmp_cnt, *cnt, ccq, q_no);
@@ -195,8 +200,13 @@ qdio_do_sqbs(struct qdio_q *q, unsigned char state,
         q_no = q->q_no;
         if(!q->is_input_q)
                 q_no += irq->no_input_qs;
+again:
         ccq = do_sqbs(irq->sch_token, state, q_no, start, cnt);
         rc = qdio_check_ccq(q, ccq);
+        if (rc == 1) {
+                QDIO_DBF_TEXT5(1,trace,"sqAGAIN");
+                goto again;
+        }
         if (rc < 0) {
                 QDIO_DBF_TEXT3(1,trace,"sqberr");
                 sprintf(dbf_text,"%2x,%2x,%d,%d",tmp_cnt,*cnt,ccq,q_no);
@@ -1187,8 +1197,7 @@ tiqdio_is_inbound_q_done(struct qdio_q *q)
 
         if (!no_used)
                 return 1;
-
-        if (!q->siga_sync)
+        if (!q->siga_sync && !irq->is_qebsm)
                 /* we'll check for more primed buffers in qeth_stop_polling */
                 return 0;
         if (irq->is_qebsm) {