From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Nicholas A. Bellinger" Subject: [PATCH] target: Fix SCF_SCSI_CONTROL_SG_IO_CDB breakage Date: Sat, 5 Feb 2011 14:58:00 -0800 Message-ID: <1296946680-29644-1-git-send-email-nab@linux-iscsi.org> Return-path: Received: from smtp102.sbc.mail.mud.yahoo.com ([68.142.198.201]:30828 "HELO smtp102.sbc.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753700Ab1BEW5o (ORCPT ); Sat, 5 Feb 2011 17:57:44 -0500 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi , Christoph Hellwig Cc: Kai-Thorsten Hambrecht , James Bottomley , Nicholas Bellinger From: Nicholas Bellinger This patch fixes a bug introduced during the v4 control CDB emulation refactoring that broke SCF_SCSI_CONTROL_SG_IO_CDB operation within transport_map_control_cmd_to_task(). It moves the BUG_ON() into transport_do_se_mem_map() after the TRANSPORT(dev)->do_se_mem_map() RAMDISK_DR special case, and adds the proper struct se_mem assignment when !list_empty() for normal non RAMDISK_DR backend device cases. Reported-by: Kai-Thorsten Hambrecht Signed-off-by: Nicholas A. Bellinger --- drivers/target/target_core_transport.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index b2ff1b1..b2fc558 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -4855,6 +4855,8 @@ static int transport_do_se_mem_map( return ret; } + + BUG_ON(list_empty(se_mem_list)); /* * This is the normal path for all normal non BIDI and BIDI-COMMAND * WRITE payloads.. If we need to do BIDI READ passthrough for @@ -5036,7 +5038,9 @@ transport_map_control_cmd_to_task(struct se_cmd *cmd) struct se_mem *se_mem = NULL, *se_mem_lout = NULL; u32 se_mem_cnt = 0, task_offset = 0; - BUG_ON(list_empty(cmd->t_task->t_mem_list)); + if (!list_empty(T_TASK(cmd)->t_mem_list)) + se_mem = list_entry(T_TASK(cmd)->t_mem_list->next, + struct se_mem, se_list); ret = transport_do_se_mem_map(dev, task, cmd->t_task->t_mem_list, NULL, se_mem, -- 1.5.6.5