diff options
| author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:14:57 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:21 +0100 |
| commit | b2fab5acd28ead6f0dd6c3996ba23f0ef1772f15 (patch) | |
| tree | b0b96984e1a4d9c856edc9ddfc36e427951c5a86 /block/deadline-iosched.c | |
| parent | 5a5bafdc396b1da7570f84fb96a0f8a288970c5e (diff) | |
| download | lwn-b2fab5acd28ead6f0dd6c3996ba23f0ef1772f15.tar.gz lwn-b2fab5acd28ead6f0dd6c3996ba23f0ef1772f15.zip | |
elevator: make elevator_init_fn() return 0/-errno
elevator_ops->elevator_init_fn() has a weird return value. It returns
a void * which the caller should assign to q->elevator->elevator_data
and %NULL return denotes init failure.
Update such that it returns integer 0/-errno and sets elevator_data
directly as necessary.
This makes the interface more conventional and eases further cleanup.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/deadline-iosched.c')
| -rw-r--r-- | block/deadline-iosched.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c index 7bf12d793fcd..599b12e5380f 100644 --- a/block/deadline-iosched.c +++ b/block/deadline-iosched.c @@ -337,13 +337,13 @@ static void deadline_exit_queue(struct elevator_queue *e) /* * initialize elevator private data (deadline_data). */ -static void *deadline_init_queue(struct request_queue *q) +static int deadline_init_queue(struct request_queue *q) { struct deadline_data *dd; dd = kmalloc_node(sizeof(*dd), GFP_KERNEL | __GFP_ZERO, q->node); if (!dd) - return NULL; + return -ENOMEM; INIT_LIST_HEAD(&dd->fifo_list[READ]); INIT_LIST_HEAD(&dd->fifo_list[WRITE]); @@ -354,7 +354,9 @@ static void *deadline_init_queue(struct request_queue *q) dd->writes_starved = writes_starved; dd->front_merges = 1; dd->fifo_batch = fifo_batch; - return dd; + + q->elevator->elevator_data = dd; + return 0; } /* |