block: cleanup error handling in sg_io

Make sure we always clean up through the out label and just have
a single place to put the request.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 51bf515..ba8706f 100644 (file)
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -279,7 +279,6 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
        r = blk_rq_unmap_user(bio);
        if (!ret)
                ret = r;
-       blk_put_request(rq);
 
        return ret;
 }
@@ -322,10 +321,9 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
                return -ENOMEM;
        blk_rq_set_block_pc(rq);
 
-       if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
-               blk_put_request(rq);
-               return -EFAULT;
-       }
+       ret = -EFAULT;
+       if (blk_fill_sghdr_rq(q, rq, hdr, mode))
+               goto out;
 
        if (hdr->iovec_count) {
                size_t iov_data_len;
@@ -376,7 +374,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 
        hdr->duration = jiffies_to_msecs(jiffies - start_time);
 
-       return blk_complete_sghdr_rq(rq, hdr, bio);
+       ret = blk_complete_sghdr_rq(rq, hdr, bio);
 out:
        blk_put_request(rq);
        return ret;