[PATCH 3/5] target: Fix early transport_generic_handle_tmr abort scenario

Nicholas A. Bellinger
2017-02-07T13:26:52Z

From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch fixes a bug where incoming task management requests
can be explicitly aborted during an active LUN_RESET, but who's
struct work_struct are canceled in-flight before execution.

This occurs when core_tmr_drain_tmr_list() invokes cancel_work_sync()
for the incoming se_tmr_req->task_cmd->work, resulting in cmd->work
for target_tmr_work() never getting invoked and the aborted TMR
waiting indefinately within transport_wait_for_tasks().

To address this case, perform a CMD_T_ABORTED check early in
transport_generic_handle_tmr(), and invoke the normal path via
transport_cmd_check_stop_to_fabric() to complete any TMR kthreads
blocked waiting for CMD_T_STOP in transport_wait_for_tasks().

Also, move the TRANSPORT_ISTATE_PROCESSING assignment earlier
into transport_generic_handle_tmr() so the existing check in
core_tmr_drain_tmr_list() avoids attempting abort the incoming
se_tmr_req->task_cmd->work if it has already been queued into
se_device->tmr_wq.

Reported-by: Rob Millner <rlm@daterainc.com>
Tested-by: Rob Millner <rlm@daterainc.com>
Cc: Rob Millner <rlm@daterainc.com>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_transport.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 1cadc9e..8b69843 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3110,7 +3110,6 @@ static void target_tmr_work(struct work_struct *work)
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
goto check_stop;
}
- cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

cmd->se_tfo->queue_tm_rsp(cmd);
@@ -3123,11 +3122,25 @@ int transport_generic_handle_tmr(
struct se_cmd *cmd)
{
unsigned long flags;
+ bool aborted = false;

spin_lock_irqsave(&cmd->t_state_lock, flags);
- cmd->transport_state |= CMD_T_ACTIVE;
+ if (cmd->transport_state & CMD_T_ABORTED) {
+ aborted = true;
+ } else {
+ cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
+ cmd->transport_state |= CMD_T_ACTIVE;
+ }
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

+ if (aborted) {
+ pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
+ "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
+ cmd->se_tmr_req->ref_task_tag, cmd->tag);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return 0;
+ }
+
INIT_WORK(&cmd->work, target_tmr_work);
queue_work(cmd->se_dev->tmr_wq, &cmd->work);
return 0;
--
1.9.1