[PATCH] cfq-iosched: move tasklist walk to elevator.c

We're trying to get rid of as much as possible tasklist walks, or at
least moving them to core code.  This patch falls into the second
category.

Instead of walking the tasklist in cfq-iosched move that into
elv_unregister.  The added benefit is that with this change the as
ioscheduler might be might unloadable more easily aswell.

The new code uses read_lock instead of read_lock_irq because the
tasklist_lock only needs irq disabling for writers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 21 deletions

diff --git a/drivers/block/cfq-iosched.c b/drivers/block/cfq-iosched.c
index 94690e4d41e0..5281f8e70510 100644
--- a/drivers/block/cfq-iosched.c
+++ b/drivers/block/cfq-iosched.c
@@ -2418,28 +2418,8 @@ static int __init cfq_init(void)
 
 static void __exit cfq_exit(void)
 {
-        struct task_struct *g, *p;
-        unsigned long flags;
-
-        read_lock_irqsave(&tasklist_lock, flags);
-
-        /*
-         * iterate each process in the system, removing our io_context
-         */
-        do_each_thread(g, p) {
-                struct io_context *ioc = p->io_context;
-
-                if (ioc && ioc->cic) {
-                        ioc->cic->exit(ioc->cic);
-                        cfq_free_io_context(ioc->cic);
-                        ioc->cic = NULL;
-                }
-        } while_each_thread(g, p);
-
-        read_unlock_irqrestore(&tasklist_lock, flags);
-
-        cfq_slab_kill();
         elv_unregister(&iosched_cfq);
+        cfq_slab_kill();
 }
 
 module_init(cfq_init);