Staging: zram: simplify zram_make_request

zram_read() and zram_write() always return zero, so make them return
void to simplify the code.
Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/zram/zram_drv.c

@@ -200,7 +200,7 @@ static void handle_uncompressed_page(struct zram *zram,
 	flush_dcache_page(page);
 }
 
-static int zram_read(struct zram *zram, struct bio *bio)
+static void zram_read(struct zram *zram, struct bio *bio)
 {
 
 	int i;
@@ -209,7 +209,7 @@ static int zram_read(struct zram *zram, struct bio *bio)
 
 	if (unlikely(!zram->init_done)) {
 		bio_endio(bio, -ENXIO);
-		return 0;
+		return;
 	}
 
 	zram_stat64_inc(zram, &zram->stats.num_reads);
@@ -271,14 +271,13 @@ static int zram_read(struct zram *zram, struct bio *bio)
 
 	set_bit(BIO_UPTODATE, &bio->bi_flags);
 	bio_endio(bio, 0);
-	return 0;
+	return;
 
 out:
 	bio_io_error(bio);
-	return 0;
 }
 
-static int zram_write(struct zram *zram, struct bio *bio)
+static void zram_write(struct zram *zram, struct bio *bio)
 {
 	int i, ret;
 	u32 index;
@@ -402,11 +401,10 @@ static int zram_write(struct zram *zram, struct bio *bio)
 
 	set_bit(BIO_UPTODATE, &bio->bi_flags);
 	bio_endio(bio, 0);
-	return 0;
+	return;
 
 out:
 	bio_io_error(bio);
-	return 0;
 }
 
 /*
@@ -431,7 +429,6 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio)
  */
 static int zram_make_request(struct request_queue *queue, struct bio *bio)
 {
-	int ret = 0;
 	struct zram *zram = queue->queuedata;
 
 	if (!valid_io_request(zram, bio)) {
@@ -442,15 +439,15 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
 
 	switch (bio_data_dir(bio)) {
 	case READ:
-		ret = zram_read(zram, bio);
+		zram_read(zram, bio);
 		break;
 
 	case WRITE:
-		ret = zram_write(zram, bio);
+		zram_write(zram, bio);
 		break;
 	}
 
-	return ret;
+	return 0;
 }
 
 void zram_reset_device(struct zram *zram)