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| author | Mike Snitzer <snitzer@redhat.com> | 2010-05-25 13:15:15 -0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-06-04 13:47:06 +0200 |
| commit | 1abec4fdbb142e3ccb6ce99832fae42129134a96 (patch) | |
| tree | 5adffee38a35b3639282da545846171715e9d689 /block/elevator.c | |
| parent | c86d1b8ae622e1ea5d20e98bd72fbd7d9dd69016 (diff) | |
| download | lwn-1abec4fdbb142e3ccb6ce99832fae42129134a96.tar.gz lwn-1abec4fdbb142e3ccb6ce99832fae42129134a96.zip | |
block: make blk_init_free_list and elevator_init idempotent
blk_init_allocated_queue_node may fail and the caller _could_ retry.
Accommodate the unlikely event that blk_init_allocated_queue_node is
called on an already initialized (possibly partially) request_queue.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/elevator.c')
| -rw-r--r-- | block/elevator.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/elevator.c b/block/elevator.c index 0abce473d606..923a9139106c 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -242,9 +242,11 @@ int elevator_init(struct request_queue *q, char *name) { struct elevator_type *e = NULL; struct elevator_queue *eq; - int ret = 0; void *data; + if (unlikely(q->elevator)) + return 0; + INIT_LIST_HEAD(&q->queue_head); q->last_merge = NULL; q->end_sector = 0; @@ -284,7 +286,7 @@ int elevator_init(struct request_queue *q, char *name) } elevator_attach(q, eq, data); - return ret; + return 0; } EXPORT_SYMBOL(elevator_init); |