Avoid submitting patches to a vcc which is being closed. Things go badly wrong when the ->pop method gets later called after everything's been torn down.
Signed-off-by: David Woodhouse <david.woodho...@intel.com>
---
On Tue, 2012-11-27 at 22:36 +0000, David Woodhouse wrote:
> Nathan, does this help?
I think that's necessary, but not sufficient. You'll want something like
this too... I can now kill br2684ctl while there's a flood of outgoing
packets, and get a handful of the printks that I had in here until a few
seconds ago when I edited it out of the patch in my mail client... and
no more panic.
I do also now have Krzysztof's patch 1/7 (detach protocol before closing
vcc) but I don't think it actually matters any more.
--- a/net/atm/br2684.c~ 2012-11-23 23:14:29.000000000 +0000
+++ b/net/atm/br2684.c 2012-11-27 23:09:18.502403881 +0000
@@ -249,6 +249,12 @@ static int br2684_xmit_vcc(struct sk_buf
skb_debug(skb);
ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
+ if (test_bit(ATM_VF_RELEASED, &atmvcc->flags)
+ || test_bit(ATM_VF_CLOSE, &atmvcc->flags)
+ || !test_bit(ATM_VF_READY, &atmvcc->flags)) {
+ dev_kfree_skb(skb);
+ return 0;
+ }
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
ATM_SKB(skb)->atm_options = atmvcc->atm_options;
--
dwmw2
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