From bf74a370eb4086d3aee77c73e95303ee24779ee8 Mon Sep 17 00:00:00 2001 From: Magnus Karlsson Date: Mon, 14 Sep 2020 16:50:36 +0200 Subject: xsk: Fix refcount warning in xp_dma_map Fix a potential refcount warning that a zero value is increased to one in xp_dma_map, by initializing the refcount to one to start with, instead of zero plus a refcount_inc(). Fixes: 921b68692abb ("xsk: Enable sharing of dma mappings") Signed-off-by: Magnus Karlsson Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Link: https://lore.kernel.org/bpf/1600095036-23868-1-git-send-email-magnus.karlsson@gmail.com --- net/xdp/xsk_buff_pool.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/xdp') diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 5b00bc5707f2..e63fadd000db 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -296,7 +296,7 @@ static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_devi dma_map->dev = dev; dma_map->dma_need_sync = false; dma_map->dma_pages_cnt = nr_pages; - refcount_set(&dma_map->users, 0); + refcount_set(&dma_map->users, 1); list_add(&dma_map->list, &umem->xsk_dma_list); return dma_map; } @@ -369,7 +369,6 @@ static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_ pool->dev = dma_map->dev; pool->dma_pages_cnt = dma_map->dma_pages_cnt; pool->dma_need_sync = dma_map->dma_need_sync; - refcount_inc(&dma_map->users); memcpy(pool->dma_pages, dma_map->dma_pages, pool->dma_pages_cnt * sizeof(*pool->dma_pages)); @@ -390,6 +389,7 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev, if (err) return err; + refcount_inc(&dma_map->users); return 0; } -- cgit v1.2.3-70-g09d2