This is a note to let you know that I've just added the patch titled
target: Fix ordered task target_setup_cmd_from_cdb exception hang
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-fix-ordered-task-target_setup_cmd_from_cdb-exception-hang.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 17 May 2016 22:19:10 -0700
Subject: target: Fix ordered task target_setup_cmd_from_cdb exception hang
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a upstream.
If a command with a Simple task attribute is failed due to a Unit
Attention, then a subsequent command with an Ordered task attribute
will hang forever. The reason for this is that the Unit Attention
status is checked for in target_setup_cmd_from_cdb, before the call
to target_execute_cmd, which calls target_handle_task_attr, which
in turn increments dev->simple_cmds.
However, transport_generic_request_failure still calls
transport_complete_task_attr, which will decrement dev->simple_cmds.
In this case, simple_cmds is now -1. So when a command with the
Ordered task attribute is sent, target_handle_task_attr sees that
dev->simple_cmds is not 0, so it decides it can't execute the
command until all the (nonexistent) Simple commands have completed.
Reported-by: Michael Cyr <mikecyr@xxxxxxxxxxxxxxxxxx>
Tested-by: Michael Cyr <mikecyr@xxxxxxxxxxxxxxxxxx>
Reported-by: Bryant G. Ly <bryantly@xxxxxxxxxxxxxxxxxx>
Tested-by: Bryant G. Ly <bryantly@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_internal.h | 1
drivers/target/target_core_sbc.c | 2 -
drivers/target/target_core_transport.c | 62 ++++++++++++++++++---------------
include/target/target_core_fabric.h | 1
4 files changed, 37 insertions(+), 29 deletions(-)
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -148,6 +148,7 @@ sense_reason_t target_cmd_size_check(str
void target_qf_do_work(struct work_struct *work);
bool target_check_wce(struct se_device *dev);
bool target_check_fua(struct se_device *dev);
+void __target_execute_cmd(struct se_cmd *, bool);
/* target_core_stat.c */
void target_stat_setup_dev_default_groups(struct se_device *);
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -594,7 +594,7 @@ static sense_reason_t compare_and_write_
cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
spin_unlock_irq(&cmd->t_state_lock);
- __target_execute_cmd(cmd);
+ __target_execute_cmd(cmd, false);
kfree(buf);
return ret;
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1270,23 +1270,6 @@ target_setup_cmd_from_cdb(struct se_cmd
trace_target_sequencer_start(cmd);
- /*
- * Check for an existing UNIT ATTENTION condition
- */
- ret = target_scsi3_ua_check(cmd);
- if (ret)
- return ret;
-
- ret = target_alua_state_check(cmd);
- if (ret)
- return ret;
-
- ret = target_check_reservation(cmd);
- if (ret) {
- cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
- return ret;
- }
-
ret = dev->transport->parse_cdb(cmd);
if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
@@ -1749,20 +1732,45 @@ queue_full:
}
EXPORT_SYMBOL(transport_generic_request_failure);
-void __target_execute_cmd(struct se_cmd *cmd)
+void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
{
sense_reason_t ret;
- if (cmd->execute_cmd) {
- ret = cmd->execute_cmd(cmd);
- if (ret) {
- spin_lock_irq(&cmd->t_state_lock);
- cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
- spin_unlock_irq(&cmd->t_state_lock);
+ if (!cmd->execute_cmd) {
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto err;
+ }
+ if (do_checks) {
+ /*
+ * Check for an existing UNIT ATTENTION condition after
+ * target_handle_task_attr() has done SAM task attr
+ * checking, and possibly have already defered execution
+ * out to target_restart_delayed_cmds() context.
+ */
+ ret = target_scsi3_ua_check(cmd);
+ if (ret)
+ goto err;
+
+ ret = target_alua_state_check(cmd);
+ if (ret)
+ goto err;
- transport_generic_request_failure(cmd, ret);
+ ret = target_check_reservation(cmd);
+ if (ret) {
+ cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+ goto err;
}
}
+
+ ret = cmd->execute_cmd(cmd);
+ if (!ret)
+ return;
+err:
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
+
+ transport_generic_request_failure(cmd, ret);
}
static int target_write_prot_action(struct se_cmd *cmd)
@@ -1887,7 +1895,7 @@ void target_execute_cmd(struct se_cmd *c
return;
}
- __target_execute_cmd(cmd);
+ __target_execute_cmd(cmd, true);
}
EXPORT_SYMBOL(target_execute_cmd);
@@ -1911,7 +1919,7 @@ static void target_restart_delayed_cmds(
list_del(&cmd->se_delayed_node);
spin_unlock(&dev->delayed_cmd_lock);
- __target_execute_cmd(cmd);
+ __target_execute_cmd(cmd, true);
if (cmd->sam_task_attr == TCM_ORDERED_TAG)
break;
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -163,7 +163,6 @@ int core_tmr_alloc_req(struct se_cmd *,
void core_tmr_release_req(struct se_tmr_req *);
int transport_generic_handle_tmr(struct se_cmd *);
void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
-void __target_execute_cmd(struct se_cmd *);
int transport_lookup_tmr_lun(struct se_cmd *, u64);
void core_allocate_nexus_loss_ua(struct se_node_acl *acl);
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-4.4/target-fix-max_unmap_lba_count-calc-overflow.patch
queue-4.4/target-fix-ordered-task-check_condition-early-exception-handling.patch
queue-4.4/target-fix-race-between-iscsi-target-connection-shutdown-abort_task.patch
queue-4.4/target-fix-ordered-task-target_setup_cmd_from_cdb-exception-hang.patch
queue-4.4/iscsi-target-fix-panic-when-adding-second-tcp-connection-to-iscsi-session.patch
queue-4.4/target-fix-missing-complete-during-abort_task-cmd_t_fabric_stop.patch
--
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