4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Bellinger nab@linux-iscsi.org
commit 1c79df1f349fb6050016cea4ef1dfbc3853a5685 upstream.
This patch fixes a bug during QUEUE_FULL where transport_complete_qf() calls transport_complete_task_attr() after it's already been invoked by target_complete_ok_work() or transport_generic_request_failure() during initial completion, preceeding QUEUE_FULL.
This will result in se_device->simple_cmds, se_device->dev_cur_ordered_id and/or se_device->dev_ordered_sync being updated multiple times for a single se_cmd.
To address this bug, clear SCF_TASK_ATTR_SET after the first call to transport_complete_task_attr(), and avoid updating SCSI task attribute related counters for any subsequent calls.
Also, when a se_cmd is deferred due to ordered tags and executed via target_restart_delayed_cmds(), set CMD_T_SENT before execution matching what target_execute_cmd() does.
Cc: Michael Cyr mikecyr@linux.vnet.ibm.com Cc: Bryant G. Ly bryantly@linux.vnet.ibm.com Cc: Mike Christie mchristi@redhat.com Cc: Hannes Reinecke hare@suse.com Signed-off-by: Nicholas Bellinger nab@linux-iscsi.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/target/target_core_transport.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1970,6 +1970,8 @@ static void target_restart_delayed_cmds( list_del(&cmd->se_delayed_node); spin_unlock(&dev->delayed_cmd_lock);
+ cmd->transport_state |= CMD_T_SENT; + __target_execute_cmd(cmd, true);
if (cmd->sam_task_attr == TCM_ORDERED_TAG) @@ -2007,6 +2009,8 @@ static void transport_complete_task_attr pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", dev->dev_cur_ordered_id); } + cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET; + restart: target_restart_delayed_cmds(dev); }