netdev - [PATCH net-next] x86: bpf_jit_comp: can call module

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Message-ID: <1368769530.3301.81.camel@edumazet-glaptop>
Date:	Thu, 16 May 2013 22:45:30 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Al Viro <viro@...IV.linux.org.uk>
Subject: [PATCH net-next]  x86: bpf_jit_comp: can call module_free() from
 any context

From: Eric Dumazet <edumazet@...gle.com>

It looks like we can call module_free()/vfree() from softirq context,
so no longer need a wrapper and a work_struct.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Al Viro <viro@...IV.linux.org.uk>
---
 arch/x86/net/bpf_jit_comp.c |   20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index f66b540..c0212db 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -717,9 +717,7 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 			break;
 		}
 		if (proglen == oldproglen) {
-			image = module_alloc(max_t(unsigned int,
-						   proglen,
-						   sizeof(struct work_struct)));
+			image = module_alloc(proglen);
 			if (!image)
 				goto out;
 		}
@@ -738,20 +736,8 @@ out:
 	return;
 }
 
-static void jit_free_defer(struct work_struct *arg)
-{
-	module_free(NULL, arg);
-}
-
-/* run from softirq, we must use a work_struct to call
- * module_free() from process context
- */
 void bpf_jit_free(struct sk_filter *fp)
 {
-	if (fp->bpf_func != sk_run_filter) {
-		struct work_struct *work = (struct work_struct *)fp->bpf_func;
-
-		INIT_WORK(work, jit_free_defer);
-		schedule_work(work);
-	}
+	if (fp->bpf_func != sk_run_filter)
+		module_free(NULL, fp->bpf_func);
 }


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