From: Frank Pavlic Date: Tue, 17 Jul 2007 11:36:04 +0000 (+0200) Subject: [S390] qdio: output queue stall on FCP and network devices X-Git-Tag: v2.6.23-rc1~508^2~5 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6cbed91ab78e750eef2dacb75bd51bd63792fd07;p=karo-tx-linux.git [S390] qdio: output queue stall on FCP and network devices When running QIOASSIST enabled qdio devices in a z/VM environment the output queue for such devices stall in heavy workload situations. When SQBS and EQBS instructions returns CCQ=96 qdio does not reissue the instruction again with the register settings done by millicode but processed the returned qdio buffer. This is wrong. qdio has to reissue the instruction once again on CCQ=96, as we already do it for CCQ=97. Signed-off-by: Frank Pavlic Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index e70aeb7a3781..ae437322c9ca 100644 --- a/drivers/s390/cio/qdio.c +++ b/drivers/s390/cio/qdio.c @@ -166,9 +166,9 @@ qdio_check_ccq(struct qdio_q *q, unsigned int ccq) { char dbf_text[15]; - if (ccq == 0 || ccq == 32 || ccq == 96) + if (ccq == 0 || ccq == 32) return 0; - if (ccq == 97) + if (ccq == 96 || ccq == 97) return 1; /*notify devices immediately*/ sprintf(dbf_text,"%d", ccq);