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block: kill swap_io_context()

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It blindly copies everything in the io_context, including the lock.
That doesn't work so well for either lock ordering or lockdep.

There seems zero point in swapping io contexts on a request to request
merge, so the best point of action is to just remove it.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-02-01 11:34:49 +01:00
parent 8bdd3f8a69
commit 3bc217ffe6
3 changed files with 0 additions and 24 deletions
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block/as-iosched.c
-14
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@@ -1268,22 +1268,8 @@ static void as_merged_requests(struct request_queue *q, struct request *req,
*/
if (!list_empty(&req->queuelist) && !list_empty(&next->queuelist)) {
if (time_before(rq_fifo_time(next), rq_fifo_time(req))) {
struct io_context *rioc = RQ_IOC(req);
struct io_context *nioc = RQ_IOC(next);
list_move(&req->queuelist, &next->queuelist);
rq_set_fifo_time(req, rq_fifo_time(next));
/*
* Don't copy here but swap, because when anext is
* removed below, it must contain the unused context
*/
if (rioc != nioc) {
double_spin_lock(&rioc->lock, &nioc->lock,
rioc < nioc);
swap_io_context(&rioc, &nioc);
double_spin_unlock(&rioc->lock, &nioc->lock,
rioc < nioc);
}
}
}