From b262924be03d5d2ae735bc9a4b37eb2c613f61f8 Mon Sep 17 00:00:00 2001 From: Wenwei Tao Date: Tue, 12 Jan 2016 07:49:25 +0100 Subject: [PATCH] lightnvm: fix locking and mempool in rrpc_lun_gc MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This patch fix two issues in rrpc_lun_gc 1. prio_list is protected by rrpc_lun's lock not nvm_lun's, so acquire rlun's lock instead of lun's before operate on the list. 2. we delete block from prio_list before allocating gcb, but gcb allocation may fail, we end without putting it back to the list, this makes the block won't get reclaimed in the future. To solve this issue, delete block after gcb allocation. Signed-off-by: Wenwei Tao Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/rrpc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c index bee2352fcce1..745acd9db523 100644 --- a/drivers/lightnvm/rrpc.c +++ b/drivers/lightnvm/rrpc.c @@ -445,7 +445,7 @@ static void rrpc_lun_gc(struct work_struct *work) if (nr_blocks_need < rrpc->nr_luns) nr_blocks_need = rrpc->nr_luns; - spin_lock(&lun->lock); + spin_lock(&rlun->lock); while (nr_blocks_need > lun->nr_free_blocks && !list_empty(&rlun->prio_list)) { struct rrpc_block *rblock = block_prio_find_max(rlun); @@ -454,16 +454,16 @@ static void rrpc_lun_gc(struct work_struct *work) if (!rblock->nr_invalid_pages) break; + gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC); + if (!gcb) + break; + list_del_init(&rblock->prio); BUG_ON(!block_is_full(rrpc, rblock)); pr_debug("rrpc: selected block '%lu' for GC\n", block->id); - gcb = mempool_alloc(rrpc->gcb_pool, GFP_ATOMIC); - if (!gcb) - break; - gcb->rrpc = rrpc; gcb->rblk = rblock; INIT_WORK(&gcb->ws_gc, rrpc_block_gc); @@ -472,7 +472,7 @@ static void rrpc_lun_gc(struct work_struct *work) nr_blocks_need--; } - spin_unlock(&lun->lock); + spin_unlock(&rlun->lock); /* TODO: Hint that request queue can be started again */ } -- 2.20.1