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target: Fix early transport_generic_handle_tmr abort scenario
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> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org # 3.14+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -3110,7 +3110,6 @@ static void target_tmr_work(struct work_struct *work)
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spin_unlock_irqrestore(&cmd->t_state_lock, flags);
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goto check_stop;
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}
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cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
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spin_unlock_irqrestore(&cmd->t_state_lock, flags);
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cmd->se_tfo->queue_tm_rsp(cmd);
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@ -3123,11 +3122,25 @@ int transport_generic_handle_tmr(
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struct se_cmd *cmd)
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{
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unsigned long flags;
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bool aborted = false;
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spin_lock_irqsave(&cmd->t_state_lock, flags);
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cmd->transport_state |= CMD_T_ACTIVE;
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if (cmd->transport_state & CMD_T_ABORTED) {
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aborted = true;
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} else {
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cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
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cmd->transport_state |= CMD_T_ACTIVE;
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}
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spin_unlock_irqrestore(&cmd->t_state_lock, flags);
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if (aborted) {
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pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
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"ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
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cmd->se_tmr_req->ref_task_tag, cmd->tag);
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transport_cmd_check_stop_to_fabric(cmd);
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return 0;
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}
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INIT_WORK(&cmd->work, target_tmr_work);
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queue_work(cmd->se_dev->tmr_wq, &cmd->work);
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return 0;
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