[PATCH] Cleanup blk_rq_map_* interfaces
Change the blk_rq_map_user() and blk_rq_map_kern() interface to require
a previously allocated request to be passed in. This is both more efficient
for multiple iterations of mapping data to the same request, and it is also
a much nicer API.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index beaa561..6a7d926 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2097,6 +2097,10 @@
if (!q)
return -ENXIO;
+ rq = blk_get_request(q, READ, GFP_KERNEL);
+ if (!rq)
+ return -ENOMEM;
+
cdi->last_sense = 0;
while (nframes) {
@@ -2108,9 +2112,9 @@
len = nr * CD_FRAMESIZE_RAW;
- rq = blk_rq_map_user(q, READ, ubuf, len);
- if (IS_ERR(rq))
- return PTR_ERR(rq);
+ ret = blk_rq_map_user(q, rq, ubuf, len);
+ if (ret)
+ break;
memset(rq->cmd, 0, sizeof(rq->cmd));
rq->cmd[0] = GPCMD_READ_CD;
@@ -2138,7 +2142,7 @@
cdi->last_sense = s->sense_key;
}
- if (blk_rq_unmap_user(rq, bio, len))
+ if (blk_rq_unmap_user(bio, len))
ret = -EFAULT;
if (ret)
@@ -2149,6 +2153,7 @@
ubuf += len;
}
+ blk_put_request(rq);
return ret;
}