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authorTejun Heo <tj@kernel.org>2015-08-18 14:54:57 -0700
committerJens Axboe <axboe@fb.com>2015-08-18 15:49:15 -0700
commit4ebc1c61d6185604c97fd0b0355ab668052044ab (patch)
tree366acca07997da745139dba40070eea624f768b9 /block
parent5634cc2aa9aebc77bc862992e7805469dcf83dac (diff)
downloadlinux-4ebc1c61d6185604c97fd0b0355ab668052044ab.tar.bz2
cfq-iosched: simplify control flow in cfq_get_queue()
cfq_get_queue()'s control flow looks like the following. async_cfqq = NULL; cfqq = NULL; if (!is_sync) { ... async_cfqq = ...; cfqq = *async_cfqq; } if (!cfqq) cfqq = ...; if (!is_sync && !(*async_cfqq)) ...; The only thing the local variable init, the second if, and the async_cfqq test in the third if achieves is to skip cfqq creation and installation if *async_cfqq was already non-NULL. This is needlessly complicated with different tests examining the same condition. Simplify it to the following. if (!is_sync) { ... async_cfqq = ...; cfqq = *async_cfqq; if (cfqq) goto out; } cfqq = ...; if (!is_sync) ...; out: Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Jeff Moyer <jmoyer@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index c62bb2e650b8..e91093d0c0eb 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3731,8 +3731,8 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
{
int ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio);
int ioprio = IOPRIO_PRIO_DATA(cic->ioprio);
- struct cfq_queue **async_cfqq = NULL;
- struct cfq_queue *cfqq = NULL;
+ struct cfq_queue **async_cfqq;
+ struct cfq_queue *cfqq;
if (!is_sync) {
if (!ioprio_valid(cic->ioprio)) {
@@ -3742,19 +3742,20 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
}
async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio);
cfqq = *async_cfqq;
+ if (cfqq)
+ goto out;
}
- if (!cfqq)
- cfqq = cfq_find_alloc_queue(cfqd, is_sync, cic, bio, gfp_mask);
+ cfqq = cfq_find_alloc_queue(cfqd, is_sync, cic, bio, gfp_mask);
/*
* pin the queue now that it's allocated, scheduler exit will prune it
*/
- if (!is_sync && !(*async_cfqq)) {
+ if (!is_sync) {
cfqq->ref++;
*async_cfqq = cfqq;
}
-
+out:
cfqq->ref++;
return cfqq;
}