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FAILED: patch "[PATCH] qla2xxx: Fix incorrect tcm_qla2xxx_free_cmd use during TMR" failed to apply to 3.18-stable tree

PATCH [email protected] 1 participant 1 message Aug 14, 2017

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Stable branch SCSI QLogic QLA2XXX FC-SCSI driver
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The patch below does not apply to the 3.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 6bcbb3174caa5f1ccc894f8ae077631659d5a629 Mon Sep 17 00:00:00 2001

From: Nicholas Bellinger <[email protected]>
Date: Fri, 30 Jun 2017 00:08:13 -0700
Subject: [PATCH] qla2xxx: Fix incorrect tcm_qla2xxx_free_cmd use during TMR
ABORT (v2)

This patch drops two incorrect usages of tcm_qla2xxx_free_cmd() during TMR ABORT within tcm_qla2xxx_handle_data_work() and tcm_qla2xxx_aborted_task(), which where attempting to dispatch into workqueue context to do tcm_qla2xxx_complete_free() and subsequently invoke transport_generic_free_cmd().

This is incorrect because during TMR ABORT target-core will drop the outstanding se_cmd->cmd_kref references once it has quiesced the se_cmd via transport_wait_for_tasks(), and in the case of qla2xxx it should not attempt to do it's own transport_generic_free_cmd() once the abort has occured.

As reported by Pascal, this was originally manifesting as a BUG_ON(cmd->cmd_in_wq) in qlt_free_cmd() during TMR ABORT, with a LIO backend that had sufficently high enough WRITE latency to trigger a host side TMR ABORT_TASK.

(v2: Drop the qla_tgt_cmd->write_pending_abort_comp changes,
as they will be addressed in a seperate series)

Reported-by Pascal de Bruijn <[email protected]>
Tested-by Pascal de Bruijn <[email protected]>
Cc Pascal de Bruijn <[email protected]>
Reported-by Lukasz Engel <[email protected]>
Cc Lukasz Engel <[email protected]>
Acked-by Himanshu Madhani <[email protected]>
Cc Quinn Tran <[email protected]>
Cc <[email protected]> # 3.10+
Signed-off-by Nicholas Bellinger <[email protected]>
drivers/scsi/qla2xxx/tcm_qla2xxx.c +0 -30
index b20da0d27ad7..3f82ea1b72dc 100644
@@ -500,7 +500,6 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
 static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
 {
 	struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
-	unsigned long flags;
 
 	/*
 	 * Ensure that the complete FCP WRITE payload has been received.

@@ -508,17 +507,6 @@ static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
 	 */
 	cmd->cmd_in_wq = 0;
 
-	spin_lock_irqsave(&cmd->cmd_lock, flags);
-	cmd->data_work = 1;
-	if (cmd->aborted) {
-		cmd->data_work_free = 1;
-		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-
-		tcm_qla2xxx_free_cmd(cmd);
-		return;
-	}
-	spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-
 	cmd->qpair->tgt_counters.qla_core_ret_ctio++;
 	if (!cmd->write_data_transferred) {
 		/*

@@ -765,31 +753,13 @@ static void tcm_qla2xxx_queue_tm_rsp(struct se_cmd *se_cmd)
 	qlt_xmit_tm_rsp(mcmd);
 }
 
-#define DATA_WORK_NOT_FREE(_cmd) (_cmd->data_work && !_cmd->data_work_free)
 static void tcm_qla2xxx_aborted_task(struct se_cmd *se_cmd)
 {
 	struct qla_tgt_cmd *cmd = container_of(se_cmd,
 				struct qla_tgt_cmd, se_cmd);
-	unsigned long flags;
 
 	if (qlt_abort_cmd(cmd))
 		return;
-
-	spin_lock_irqsave(&cmd->cmd_lock, flags);
-	if ((cmd->state == QLA_TGT_STATE_NEW)||
-	    ((cmd->state == QLA_TGT_STATE_DATA_IN) &&
-		DATA_WORK_NOT_FREE(cmd))) {
-		cmd->data_work_free = 1;
-		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-		/*
-		 * cmd has not reached fw, Use this trigger to free it.
-		 */
-		tcm_qla2xxx_free_cmd(cmd);
-		return;
-	}
-	spin_unlock_irqrestore(&cmd->cmd_lock, flags);
-	return;
-
 }
 
 static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *,