From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: [PATCHv3 18/24] scsi_dh_alua: update all port states Date: Wed, 13 Jan 2016 09:09:53 +0100 Message-ID: <1452672599-9820-19-git-send-email-hare@suse.de> References: <1452672599-9820-1-git-send-email-hare@suse.de> Return-path: Received: from mx2.suse.de ([195.135.220.15]:58979 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755003AbcAMIKU (ORCPT ); Wed, 13 Jan 2016 03:10:20 -0500 In-Reply-To: <1452672599-9820-1-git-send-email-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Martin K. Petersen" Cc: James Bottomley , Christoph Hellwig , Bart von Assche , Ewan Milne , linux-scsi@vger.kernel.org, Hannes Reinecke When we read in the target port group state we should be updating all affected port groups, otherwise we risk running out of sync. Signed-off-by: Hannes Reinecke --- drivers/scsi/device_handler/scsi_dh_alua.c | 31 +++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c index 294551a..e347a31 100644 --- a/drivers/scsi/device_handler/scsi_dh_alua.c +++ b/drivers/scsi/device_handler/scsi_dh_alua.c @@ -490,11 +490,13 @@ static int alua_check_sense(struct scsi_device *sdev, static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) { struct scsi_sense_hdr sense_hdr; + struct alua_port_group *tmp_pg; int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE; - unsigned char *ucp, *buff; + unsigned char *desc, *buff; unsigned err, retval; unsigned int tpg_desc_tbl_off; unsigned char orig_transition_tmo; + unsigned long flags; if (!pg->expiry) { unsigned long transition_tmo = ALUA_FAILOVER_TIMEOUT * HZ; @@ -596,16 +598,27 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) else tpg_desc_tbl_off = 4; - for (k = tpg_desc_tbl_off, ucp = buff + tpg_desc_tbl_off; + for (k = tpg_desc_tbl_off, desc = buff + tpg_desc_tbl_off; k < len; - k += off, ucp += off) { - - if (pg->group_id == get_unaligned_be16(&ucp[2])) { - pg->state = ucp[0] & 0x0f; - pg->pref = ucp[0] >> 7; - valid_states = ucp[1]; + k += off, desc += off) { + u16 group_id = get_unaligned_be16(&desc[2]); + + spin_lock_irqsave(&port_group_lock, flags); + list_for_each_entry(tmp_pg, &port_group_list, node) { + if (tmp_pg->group_id != group_id) + continue; + if (tmp_pg->device_id_len != pg->device_id_len) + continue; + if (strncmp(tmp_pg->device_id_str, pg->device_id_str, + tmp_pg->device_id_len)) + continue; + tmp_pg->state = desc[0] & 0x0f; + tmp_pg->pref = desc[0] >> 7; + if (tmp_pg == pg) + valid_states = desc[1]; } - off = 8 + (ucp[7] * 4); + spin_unlock_irqrestore(&port_group_lock, flags); + off = 8 + (desc[7] * 4); } sdev_printk(KERN_INFO, sdev, -- 1.8.5.6