From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bryant G. Ly" Subject: [PATCH] target: Unsupported SCSI Opcode Fix Date: Thu, 30 Jun 2016 13:50:18 -0500 Message-ID: <1467312618-21592-1-git-send-email-bryantly@linux.vnet.ibm.com> References: Return-path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:35918 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750929AbcF3SuZ (ORCPT ); Thu, 30 Jun 2016 14:50:25 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u5UInLu7126608 for ; Thu, 30 Jun 2016 14:50:25 -0400 Received: from e19.ny.us.ibm.com (e19.ny.us.ibm.com [129.33.205.209]) by mx0b-001b2d01.pphosted.com with ESMTP id 23w76nuxay-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 30 Jun 2016 14:50:24 -0400 Received: from localhost by e19.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 30 Jun 2016 14:50:24 -0400 In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: nab@linux-iscsi.org Cc: mikecyr@linux.vnet.ibm.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, "Bryant G. Ly" If a Simple command is sent with a failure, target_setup_cmd_from_cdb returns with TCM_UNSUPPORTED_SCSI_OPCODE or TCM_INVALID_CDB_FIELD. So in the cases where target_setup_cmd_from_cdb returns an error, we never get far enough to call target_execute_cmd to increment simple_cmds. Since simple_cmds isn't incremented, the result of the failure from target_setup_cmd_from_cdb causes transport_generic_request_failure to decrement simple_cmds, due to call to transport_complete_task_attr. With this dev->simple_cmds or dev->dev_ordered_sync is now -1, not 0. So when a subsequent command with an Ordered Task is sent, it causes a hang, since dev->simple_cmds is at -1. Signed-off-by: Michael Cyr Signed-off-by: Bryant G. Ly --- drivers/target/target_core_transport.c | 6 ++++++ include/target/target_core_base.h | 3 ++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 0a8f0a6..a2e447a 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1824,6 +1824,8 @@ static bool target_handle_task_attr(struct se_cmd *cmd) if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) return false; + cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; + /* * Check for the existence of HEAD_OF_QUEUE, and if true return 1 * to allow the passed struct se_cmd list of tasks to the front of the list. @@ -1946,6 +1948,9 @@ static void transport_complete_task_attr(struct se_cmd *cmd) if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) return; + if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) + goto restart; + if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { atomic_dec_mb(&dev->simple_cmds); dev->dev_cur_ordered_id++; @@ -1963,6 +1968,7 @@ static void transport_complete_task_attr(struct se_cmd *cmd) dev->dev_cur_ordered_id); } +restart: target_restart_delayed_cmds(dev); } diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index e5d0948..276f5a5 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -139,7 +139,8 @@ enum se_cmd_flags_table { SCF_COMPARE_AND_WRITE_POST = 0x00100000, SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC = 0x00200000, SCF_ACK_KREF = 0x00400000, - SCF_USE_CPUID = 0x00800000, + SCF_USE_CPUID = 0x00800000, + SCF_TASK_ATTR_SET = 0x01000000, }; /* struct se_dev_entry->lun_flags and struct se_lun->lun_access */ -- 2.5.4 (Apple Git-61)