[IPCOMP]: Disable BH on output when using shared tfm

Because we use shared tfm objects in order to conserve memory,
(each tfm requires 128K of vmalloc memory), BH needs to be turned
off on output as that can occur in process context.

Previously this was done implicitly by the xfrm output code.
That was lost when it became lockless.  So we need to add the
BH disabling to IPComp directly.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ipcomp.c

@@ -108,8 +108,11 @@ static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
 	const int cpu = get_cpu();
 	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
 	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-	int err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
+	int err;
 
+	local_bh_disable();
+	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
+	local_bh_enable();
 	if (err)
 		goto out;
 

net/ipv6/ipcomp6.c

@@ -146,7 +146,9 @@ static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
 	scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
 	tfm = *per_cpu_ptr(ipcd->tfms, cpu);
 
+	local_bh_disable();
 	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
+	local_bh_enable();
 	if (err || (dlen + sizeof(*ipch)) >= plen) {
 		put_cpu();
 		goto out_ok;