netfilter: nft_set_pipapo: add helper to release pcpu scratch area

After next patch simple kfree() is not enough anymore, so add
a helper for it.

Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c
index 54d0bac140a3b51a5bcedc19dbece2c8657c3deb..5094d4c439c3bc1c749898a4d4934ba550800fcc 100644 (file)
--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -1110,6 +1110,24 @@ static void pipapo_map(struct nft_pipapo_match *m,
                f->mt[map[i].to + j].e = e;
 }
 
+/**
+ * pipapo_free_scratch() - Free per-CPU map at original (not aligned) address
+ * @m:         Matching data
+ * @cpu:       CPU number
+ */
+static void pipapo_free_scratch(const struct nft_pipapo_match *m, unsigned int cpu)
+{
+       struct nft_pipapo_scratch *s;
+       void *mem;
+
+       s = *per_cpu_ptr(m->scratch, cpu);
+       if (!s)
+               return;
+
+       mem = s;
+       kfree(mem);
+}
+
 /**
  * pipapo_realloc_scratch() - Reallocate scratch maps for partial match results
  * @clone:     Copy of matching data with pending insertions and deletions
@@ -1142,7 +1160,7 @@ static int pipapo_realloc_scratch(struct nft_pipapo_match *clone,
                        return -ENOMEM;
                }
 
-               kfree(*per_cpu_ptr(clone->scratch, i));
+               pipapo_free_scratch(clone, i);
 
                *per_cpu_ptr(clone->scratch, i) = scratch;
 
@@ -1369,7 +1387,7 @@ out_lt:
        }
 out_scratch_realloc:
        for_each_possible_cpu(i)
-               kfree(*per_cpu_ptr(new->scratch, i));
+               pipapo_free_scratch(new, i);
 #ifdef NFT_PIPAPO_ALIGN
        free_percpu(new->scratch_aligned);
 #endif
@@ -1653,7 +1671,7 @@ static void pipapo_free_match(struct nft_pipapo_match *m)
        int i;
 
        for_each_possible_cpu(i)
-               kfree(*per_cpu_ptr(m->scratch, i));
+               pipapo_free_scratch(m, i);
 
 #ifdef NFT_PIPAPO_ALIGN
        free_percpu(m->scratch_aligned);
@@ -2253,7 +2271,7 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx,
                free_percpu(m->scratch_aligned);
 #endif
                for_each_possible_cpu(cpu)
-                       kfree(*per_cpu_ptr(m->scratch, cpu));
+                       pipapo_free_scratch(m, cpu);
                free_percpu(m->scratch);
                pipapo_free_fields(m);
                kfree(m);
@@ -2270,7 +2288,7 @@ static void nft_pipapo_destroy(const struct nft_ctx *ctx,
                free_percpu(priv->clone->scratch_aligned);
 #endif
                for_each_possible_cpu(cpu)
-                       kfree(*per_cpu_ptr(priv->clone->scratch, cpu));
+                       pipapo_free_scratch(priv->clone, cpu);
                free_percpu(priv->clone->scratch);
 
                pipapo_free_fields(priv->clone);