From 4ca885241950265a82e922a018b90ff8047d7aac Mon Sep 17 00:00:00 2001 From: Igor Konopko Date: Sat, 4 May 2019 20:37:51 +0200 Subject: lightnvm: pblk: fix race during put line MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the pblk_put_line_back function, a race condition with __pblk_map_invalidate can make a line not part of any lists. Fix gc_list by resetting it to null fixes the above issue. Fixes: a4bd217 ("lightnvm: physical block device (pblk) target") Signed-off-by: Igor Konopko Reviewed-by: Javier González Reviewed-by: Hans Holmberg Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-gc.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'drivers/lightnvm') diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c index ea9f392a395e..e23b1923b773 100644 --- a/drivers/lightnvm/pblk-gc.c +++ b/drivers/lightnvm/pblk-gc.c @@ -64,19 +64,23 @@ static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line) struct pblk_line_mgmt *l_mg = &pblk->l_mg; struct list_head *move_list; + spin_lock(&l_mg->gc_lock); spin_lock(&line->lock); WARN_ON(line->state != PBLK_LINESTATE_GC); line->state = PBLK_LINESTATE_CLOSED; trace_pblk_line_state(pblk_disk_name(pblk), line->id, line->state); + + /* We need to reset gc_group in order to ensure that + * pblk_line_gc_list will return proper move_list + * since right now current line is not on any of the + * gc lists. + */ + line->gc_group = PBLK_LINEGC_NONE; move_list = pblk_line_gc_list(pblk, line); spin_unlock(&line->lock); - - if (move_list) { - spin_lock(&l_mg->gc_lock); - list_add_tail(&line->list, move_list); - spin_unlock(&l_mg->gc_lock); - } + list_add_tail(&line->list, move_list); + spin_unlock(&l_mg->gc_lock); } static void pblk_gc_line_ws(struct work_struct *work) -- cgit v1.2.3