floppy: remove dr, reuse drive on do_floppy_init

This is a small cleanup, that also may turn error handling of
unitialized disks more readable. We don't need a separate variable to
track allocated disks, remove dr and reuse drive variable instead.

Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/floppy.c

@@ -4131,8 +4131,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
 
 static int __init do_floppy_init(void)
 {
-	int i, unit, drive;
-	int err, dr;
+	int i, unit, drive, err;
 
 	set_debugt();
 	interruptjiffies = resultjiffies = jiffies;
@@ -4148,29 +4147,28 @@ static int __init do_floppy_init(void)
 	if (!floppy_wq)
 		return -ENOMEM;
 
-	for (dr = 0; dr < N_DRIVE; dr++) {
-		disks[dr] = alloc_disk(1);
-		if (!disks[dr]) {
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		disks[drive] = alloc_disk(1);
+		if (!disks[drive]) {
 			err = -ENOMEM;
 			goto out_put_disk;
 		}
 
-		disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
-		if (!disks[dr]->queue) {
-			put_disk(disks[dr]);
+		disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
+		if (!disks[drive]->queue) {
 			err = -ENOMEM;
 			goto out_put_disk;
 		}
 
-		blk_queue_max_hw_sectors(disks[dr]->queue, 64);
-		disks[dr]->major = FLOPPY_MAJOR;
-		disks[dr]->first_minor = TOMINOR(dr);
-		disks[dr]->fops = &floppy_fops;
-		sprintf(disks[dr]->disk_name, "fd%d", dr);
+		blk_queue_max_hw_sectors(disks[drive]->queue, 64);
+		disks[drive]->major = FLOPPY_MAJOR;
+		disks[drive]->first_minor = TOMINOR(drive);
+		disks[drive]->fops = &floppy_fops;
+		sprintf(disks[drive]->disk_name, "fd%d", drive);
 
-		init_timer(&motor_off_timer[dr]);
-		motor_off_timer[dr].data = dr;
-		motor_off_timer[dr].function = motor_off_callback;
+		init_timer(&motor_off_timer[drive]);
+		motor_off_timer[drive].data = drive;
+		motor_off_timer[drive].function = motor_off_callback;
 	}
 
 	err = register_blkdev(FLOPPY_MAJOR, "fd");
@@ -4332,17 +4330,15 @@ out_unreg_region:
 out_unreg_blkdev:
 	unregister_blkdev(FLOPPY_MAJOR, "fd");
 out_put_disk:
-	while (dr--) {
-		del_timer_sync(&motor_off_timer[dr]);
-		if (disks[dr]->queue) {
-			blk_cleanup_queue(disks[dr]->queue);
-			/*
-			 * put_disk() is not paired with add_disk() and
-			 * will put queue reference one extra time. fix it.
-			 */
-			disks[dr]->queue = NULL;
+	for (drive = 0; drive < N_DRIVE; drive++) {
+		if (!disks[drive])
+			break;
+		if (disks[drive]->queue) {
+			del_timer_sync(&motor_off_timer[drive]);
+			blk_cleanup_queue(disks[drive]->queue);
+			disks[drive]->queue = NULL;
 		}
-		put_disk(disks[dr]);
+		put_disk(disks[drive]);
 	}
 	destroy_workqueue(floppy_wq);
 	return err;