summaryrefslogtreecommitdiff
path: root/net/xdp
diff options
context:
space:
mode:
authorMagnus Karlsson <magnus.karlsson@intel.com>2020-09-14 16:50:36 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-09-14 18:43:25 -0700
commitbf74a370eb4086d3aee77c73e95303ee24779ee8 (patch)
treecad8b65505336171813194230447270387996cd4 /net/xdp
parent74e00676d7f1f3c0676fdfffcf404a09a037bfe3 (diff)
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 <magnus.karlsson@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/1600095036-23868-1-git-send-email-magnus.karlsson@gmail.com
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk_buff_pool.c4
1 files changed, 2 insertions, 2 deletions
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;
}