From: Klaus D. Wacker Date: Wed, 22 Aug 2007 11:51:38 +0000 (+0200) Subject: [S390] qdio: fix EQBS handling on CCQ96 X-Git-Tag: v2.6.23-rc4~93^2~7 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f276730f8da0e8136d8491b6ef44fc719d450a1b;p=linux-2.6 [S390] qdio: fix EQBS handling on CCQ96 QDIO returned from EQBS instruction in any case after return code CCQ=96 was issued regardless whether buffer states for at least one buffer were extracted or not. This caused FCP devices to hang when running under z/VM and having QIOASSASIST=ON and having high I/O rates. In order to fix this qdio return code processing of EQBS instruction after CCQ=96 is changed that buffers are returned and if no buffers where extracted the instruction is repeated at once. Signed-off-by: Klaus D. Wacker Signed-off-by: Martin Schwidefsky Signed-off-by: Heiko Carstens --- diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c index 03347aed2b..badfb5b213 100644 --- a/drivers/s390/cio/qdio.c +++ b/drivers/s390/cio/qdio.c @@ -195,6 +195,8 @@ qdio_do_eqbs(struct qdio_q *q, unsigned char *state, again: ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt); rc = qdio_check_ccq(q, ccq); + if ((ccq == 96) && (tmp_cnt != *cnt)) + rc = 0; if (rc == 1) { QDIO_DBF_TEXT5(1,trace,"eqAGAIN"); goto again;