From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alan D. Brunelle" Subject: [PATCH] Correctly release and allocate a new request on TUR retries Date: Fri, 05 Dec 2008 09:36:56 -0500 Message-ID: <49393C88.8080103@hp.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------040707080809010102050106" Return-path: Received: from g4t0014.houston.hp.com ([15.201.24.17]:10793 "EHLO g4t0014.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751228AbYLEOhA (ORCPT ); Fri, 5 Dec 2008 09:37:00 -0500 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "linux-kernel@vger.kernel.org" Cc: Jens Axboe , LKML-scsi This is a multi-part message in MIME format. --------------040707080809010102050106 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit --------------040707080809010102050106 Content-Type: text/x-diff; name="0001-Correctly-release-and-allocate-a-new-request-on-TUR.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename*0="0001-Correctly-release-and-allocate-a-new-request-on-TUR.pat"; filename*1="ch" Commands needing to be retried (TUR in this case) would result in a block I/O request being re-used, without being re-initialized properly. This patch ensures that the requests are correctly re-initialized via standard allocation means. Prior to this patch, boots were failing consistently as in: http://lkml.org/lkml/2008/12/5/161 With this patch in place, the system is booting reliably. Signed-off-by: Alan D. Brunelle Cc: Jens Axboe --- drivers/scsi/device_handler/scsi_dh_hp_sw.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index 9aec4ca..1f6b6a8 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -107,6 +107,7 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) struct request *req; int ret; +retry: req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); if (!req) return SCSI_DH_RES_TEMP_UNAVAIL; @@ -121,7 +122,6 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); req->sense_len = 0; -retry: ret = blk_execute_rq(req->q, NULL, req, 1); if (ret == -EIO) { if (req->sense_len > 0) { @@ -136,8 +136,10 @@ retry: h->path_state = HP_SW_PATH_ACTIVE; ret = SCSI_DH_OK; } - if (ret == SCSI_DH_IMM_RETRY) + if (ret == SCSI_DH_IMM_RETRY) { + blk_put_request(req); goto retry; + } if (ret == SCSI_DH_DEV_OFFLINED) { h->path_state = HP_SW_PATH_PASSIVE; ret = SCSI_DH_OK; -- 1.5.6.3 --------------040707080809010102050106--