scsi: qla2xxx: target: Fix offline port handling and host reset handling

Remove the function qlt_abort_cmd_on_host_reset() because it can do the
following, all of which can cause a kernel crash:

- DMA unmapping while DMA is in progress.
- Call target_execute_cmd() while DMA is in progress.
- Call transport_generic_free_cmd() while the LIO core owns a command.

Instead of trying to abort a command asynchronously, set the 'aborted' flag
and handle the abort after the hardware has passed control back to the
tcm_qla2xxx driver.

Cc: Arun Easi <arun.easi@qlogic.com>
Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Fixes: c0cb44967b ("qla2xxx: Add Host reset handling in target mode.") # v3.18.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_target.h

@@ -889,9 +889,16 @@ struct qla_tgt_cmd {
 	unsigned int term_exchg:1;
 	unsigned int cmd_sent_to_fw:1;
 	unsigned int cmd_in_wq:1;
-	unsigned int aborted:1;
 	unsigned int released:1;
 
+	/*
+	 * This variable may be set from outside the LIO and I/O completion
+	 * callback functions. Do not declare this member variable as a
+	 * bitfield to avoid a read-modify-write operation when this variable
+	 * is set.
+	 */
+	unsigned int aborted;
+
 	struct scatterlist *sg;	/* cmd data buffer SG vector */
 	int sg_cnt;		/* SG segments count */
 	int bufflen;		/* cmd buffer length */
@@ -1101,7 +1108,5 @@ extern void qlt_do_generation_tick(struct scsi_qla_host *, int *);
 
 void qlt_send_resp_ctio(struct qla_qpair *, struct qla_tgt_cmd *, uint8_t,
     uint8_t, uint8_t, uint8_t);
-extern void qlt_abort_cmd_on_host_reset(struct scsi_qla_host *,
-    struct qla_tgt_cmd *);
 
 #endif /* __QLA_TARGET_H */