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lightnvm: pblk: prevent gc kicks when gc is not operational 

[ Upstream commit 3e3a5b8ebd ]

GC can be kicked after it has been shut down when closing the last
line during exit, resulting in accesses to freed structures.

Make sure that GC is not triggered while it is not operational.
Also make sure that GC won't be re-activated during exit when
running on another processor by using timer_del_sync.

Signed-off-by: Hans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Hans Holmberg 2017-10-13 14:46:34 +02:00 committed by Greg Kroah-Hartman
parent e6a9d261e9
commit 1b07f7511a
2 changed files with 6 additions and 4 deletions
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9
drivers/lightnvm/pblk-gc.c
View File

@ -486,10 +486,10 @@ void pblk_gc_should_start(struct pblk *pblk)
{
struct pblk_gc *gc = &pblk->gc;
if (gc->gc_enabled && !gc->gc_active)
if (gc->gc_enabled && !gc->gc_active) {
pblk_gc_start(pblk);
pblk_gc_kick(pblk);
pblk_gc_kick(pblk);
}
}
/*
@ -628,7 +628,8 @@ void pblk_gc_exit(struct pblk *pblk)
flush_workqueue(gc->gc_reader_wq);
flush_workqueue(gc->gc_line_reader_wq);
del_timer(&gc->gc_timer);
gc->gc_enabled = 0;
del_timer_sync(&gc->gc_timer);
pblk_gc_stop(pblk, 1);
if (gc->gc_ts)

1
drivers/lightnvm/pblk-init.c
View File

@ -923,6 +923,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
pblk->dev = dev;
pblk->disk = tdisk;
pblk->state = PBLK_STATE_RUNNING;
pblk->gc.gc_enabled = 0;
spin_lock_init(&pblk->trans_lock);
spin_lock_init(&pblk->lock);