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

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>
This commit is contained in:
Hans Holmberg 2017-10-13 14:46:34 +02:00 committed by Jens Axboe
parent 22a4e061ea
commit 3e3a5b8ebd
2 changed files with 6 additions and 4 deletions
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7
drivers/lightnvm/pblk-gc.c
View File

@ -478,10 +478,10 @@ 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);
}
}
/*
@ -620,7 +620,8 @@ 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

@ -931,6 +931,7 @@ 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);