block: add bsg_job_put() and bsg_job_get()

Add bsg_job_put() and bsg_job_get() so don't need to export
bsg_destroy_job() any more.
Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: NHannes Reinecke <hare@suse.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

block/bsg-lib.c

@@ -32,7 +32,7 @@
  * bsg_destroy_job - routine to teardown/delete a bsg job
  * @job: bsg_job that is to be torn down
  */
-void bsg_destroy_job(struct kref *kref)
+static void bsg_destroy_job(struct kref *kref)
 {
 	struct bsg_job *job = container_of(kref, struct bsg_job, kref);
 	struct request *rq = job->req;
@@ -45,7 +45,18 @@ void bsg_destroy_job(struct kref *kref)
 	kfree(job->reply_payload.sg_list);
 	kfree(job);
 }
-EXPORT_SYMBOL_GPL(bsg_destroy_job);
+
+void bsg_job_put(struct bsg_job *job)
+{
+	kref_put(&job->kref, bsg_destroy_job);
+}
+EXPORT_SYMBOL_GPL(bsg_job_put);
+
+int bsg_job_get(struct bsg_job *job)
+{
+	return kref_get_unless_zero(&job->kref);
+}
+EXPORT_SYMBOL_GPL(bsg_job_get);
 
 /**
  * bsg_job_done - completion routine for bsg requests
@@ -89,7 +100,7 @@ void bsg_softirq_done(struct request *rq)
 {
 	struct bsg_job *job = rq->special;
 
-	kref_put(&job->kref, bsg_destroy_job);
+	bsg_job_put(job);
 }
 EXPORT_SYMBOL_GPL(bsg_softirq_done);
 

drivers/scsi/scsi_transport_fc.c

@@ -3571,13 +3571,13 @@ fc_bsg_job_timeout(struct request *req)
 	if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
 		return BLK_EH_RESET_TIMER;
 
-	inflight = kref_get_unless_zero(&job->kref);
+	inflight = bsg_job_get(job);
 
 	if (inflight && i->f->bsg_timeout) {
 		/* call LLDD to abort the i/o as it has timed out */
 		err = i->f->bsg_timeout(job);
 		if (err == -EAGAIN) {
-			kref_put(&job->kref, bsg_destroy_job);
+			bsg_job_put(job);
 			return BLK_EH_RESET_TIMER;
 		} else if (err)
 			printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "

include/linux/bsg-lib.h

@@ -69,7 +69,8 @@ void bsg_job_done(struct bsg_job *job, int result,
 int bsg_setup_queue(struct device *dev, struct request_queue *q, char *name,
 		    bsg_job_fn *job_fn, int dd_job_size);
 void bsg_request_fn(struct request_queue *q);
-void bsg_destroy_job(struct kref *kref);
 void bsg_softirq_done(struct request *rq);
+void bsg_job_put(struct bsg_job *job);
+int __must_check bsg_job_get(struct bsg_job *job);
 
 #endif