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netpoll: shut up a kernel warning on refcount 

When we convert atomic_t to refcount_t, a new kernel warning
on "increment on 0" is introduced in the netpoll code,
zap_completion_queue(). In fact for this special case, we know
the refcount is 0 and we just have to set it to 1 to satisfy
the following dev_kfree_skb_any(), so we can just use
refcount_set(..., 1) instead.

Fixes: 633547973f ("net: convert sk_buff.users from atomic_t to refcount_t")
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Cc: Reshetova, Elena <elena.reshetova@intel.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2017-07-12 15:56:41 -07:00 committed by David S. Miller
parent 2b02c20ce0
commit 230cd1279d
1 changed files with 1 additions and 1 deletions
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2
net/core/netpoll.c
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@ -277,7 +277,7 @@ static void zap_completion_queue(void)
struct sk_buff *skb = clist;
clist = clist->next;
if (!skb_irq_freeable(skb)) {
refcount_inc(&skb->users);
refcount_set(&skb->users, 1);
dev_kfree_skb_any(skb); /* put this one back */
} else {
__kfree_skb(skb);