lightnvm: update closed list outside of intr context

When an I/O finishes, full blocks are moved from the open to the closed
list - a lock is taken to protect the list. This happens at the moment
in the interrupt context, which is not correct.

This patch moves this logic to the block workqueue instead, avoiding
holding a spinlock without interrupt save in an interrupt context.
Signed-off-by: Javier González <javier@cnexlabs.com>
Fixes: ff0e498b ("lightnvm: manage open and closed blocks sepa...")
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/lightnvm/rrpc.c

@@ -497,12 +497,21 @@ static void rrpc_gc_queue(struct work_struct *work)
 	struct rrpc *rrpc = gcb->rrpc;
 	struct rrpc_block *rblk = gcb->rblk;
 	struct nvm_lun *lun = rblk->parent->lun;
+	struct nvm_block *blk = rblk->parent;
 	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
 
 	spin_lock(&rlun->lock);
 	list_add_tail(&rblk->prio, &rlun->prio_list);
 	spin_unlock(&rlun->lock);
 
+	spin_lock(&lun->lock);
+	lun->nr_open_blocks--;
+	lun->nr_closed_blocks++;
+	blk->state &= ~NVM_BLK_ST_OPEN;
+	blk->state |= NVM_BLK_ST_CLOSED;
+	list_move_tail(&rblk->list, &rlun->closed_list);
+	spin_unlock(&lun->lock);
+
 	mempool_free(gcb, rrpc->gcb_pool);
 	pr_debug("nvm: block '%lu' is full, allow GC (sched)\n",
 							rblk->parent->id);
@@ -666,21 +675,9 @@ static void rrpc_end_io_write(struct rrpc *rrpc, struct rrpc_rq *rrqd,
 		lun = rblk->parent->lun;
 
 		cmnt_size = atomic_inc_return(&rblk->data_cmnt_size);
-		if (unlikely(cmnt_size == rrpc->dev->pgs_per_blk)) {
-			struct nvm_block *blk = rblk->parent;
-			struct rrpc_lun *rlun = rblk->rlun;
-
-			spin_lock(&lun->lock);
-			lun->nr_open_blocks--;
-			lun->nr_closed_blocks++;
-			blk->state &= ~NVM_BLK_ST_OPEN;
-			blk->state |= NVM_BLK_ST_CLOSED;
-			list_move_tail(&rblk->list, &rlun->closed_list);
-			spin_unlock(&lun->lock);
-
+		if (unlikely(cmnt_size == rrpc->dev->pgs_per_blk))
 			rrpc_run_gc(rrpc, rblk);
 	}
-	}
 }
 
 static void rrpc_end_io(struct nvm_rq *rqd)