scsi: qla2xxx: Fix premature command free

When qla2xxx and Target Core gets out of sync during command cleanup, qla2xxx
will not free command until it is out of firmware's hand and Target Core has
called the release on the command.

This patch adds synchronization using cmd_lock and release flag.  If the
release flag is set, then qla2xxx will free up the command using
qlt_free_cmd() otherwise transport_generic_free_cmd() will be responsible for
relase of the command.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 42 insertions, 3 deletions

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index e03d12a5f986..7d3d4a82fe96 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -277,14 +277,25 @@ static void tcm_qla2xxx_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
 static void tcm_qla2xxx_complete_free(struct work_struct *work)
 {
 	struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
+	bool released = false;
+	unsigned long flags;
 
 	cmd->cmd_in_wq = 0;
 
 	WARN_ON(cmd->trc_flags & TRC_CMD_FREE);
 
+	spin_lock_irqsave(&cmd->cmd_lock, flags);
 	cmd->qpair->tgt_counters.qla_core_ret_sta_ctio++;
 	cmd->trc_flags |= TRC_CMD_FREE;
-	transport_generic_free_cmd(&cmd->se_cmd, 0);
+	cmd->cmd_sent_to_fw = 0;
+	if (cmd->released)
+		released = true;
+	spin_unlock_irqrestore(&cmd->cmd_lock, flags);
+
+	if (released)
+		qlt_free_cmd(cmd);
+	else
+		transport_generic_free_cmd(&cmd->se_cmd, 0);
 }
 
 /*
@@ -325,6 +336,7 @@ static int tcm_qla2xxx_check_stop_free(struct se_cmd *se_cmd)
 static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
 {
 	struct qla_tgt_cmd *cmd;
+	unsigned long flags;
 
 	if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
 		struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
@@ -332,9 +344,16 @@ static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
 		qlt_free_mcmd(mcmd);
 		return;
 	}
-
 	cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
-	qlt_free_cmd(cmd);
+
+	spin_lock_irqsave(&cmd->cmd_lock, flags);
+	if (cmd->cmd_sent_to_fw) {
+		cmd->released = 1;
+		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
+	} else {
+		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
+		qlt_free_cmd(cmd);
+	}
 }
 
 static void tcm_qla2xxx_release_session(struct kref *kref)
@@ -499,6 +518,7 @@ 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.
@@ -506,6 +526,25 @@ static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
 	 */
 	cmd->cmd_in_wq = 0;
 
+	spin_lock_irqsave(&cmd->cmd_lock, flags);
+	cmd->cmd_sent_to_fw = 0;
+
+	if (cmd->released) {
+		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
+		qlt_free_cmd(cmd);
+		return;
+	}
+
+	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) {
 		/*