scsi: Remove Scsi_Host.uspace_req_q

A patch I wrote myself several years ago removed SCSI target support
from the code under drivers/scsi. That patch removed the code that sets
uspace_req_q to a non-NULL value. Hence also remove the code that
depends on uspace_req_q != NULL.

References: commit 0664652 ("tgt: removal")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hosts.c

@@ -315,8 +315,6 @@ static void scsi_host_dev_release(struct device *dev)
 {
 	struct Scsi_Host *shost = dev_to_shost(dev);
 	struct device *parent = dev->parent;
-	struct request_queue *q;
-	void *queuedata;
 
 	scsi_proc_hostdir_rm(shost->hostt);
 
@@ -326,12 +324,6 @@ static void scsi_host_dev_release(struct device *dev)
 		kthread_stop(shost->ehandler);
 	if (shost->work_q)
 		destroy_workqueue(shost->work_q);
-	q = shost->uspace_req_q;
-	if (q) {
-		queuedata = q->queuedata;
-		blk_cleanup_queue(q);
-		kfree(queuedata);
-	}
 
 	if (shost->shost_state == SHOST_CREATED) {
 		/*

include/scsi/scsi_host.h

@@ -691,12 +691,6 @@ struct Scsi_Host {
 	unsigned int prot_capabilities;
 	unsigned char prot_guard_type;
 
-	/*
-	 * q used for scsi_tgt msgs, async events or any other requests that
-	 * need to be processed in userspace
-	 */
-	struct request_queue *uspace_req_q;
-
 	/* legacy crap */
 	unsigned long base;
 	unsigned long io_port;