From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Mon, 6 May 2013 02:10:35 +0000 (+0100)
Subject: apparmor: no need to delay vfree()
X-Git-Tag: firefly_0821_release~176^2~5790^2~12
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b5b3ee6c;p=firefly-linux-kernel-4.4.55.git

apparmor: no need to delay vfree()

vfree() can be called from interrupt contexts now

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
---

diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
index d40bc592180d..fcfe0233574c 100644
--- a/security/apparmor/lib.c
+++ b/security/apparmor/lib.c
@@ -110,19 +110,6 @@ void *__aa_kvmalloc(size_t size, gfp_t flags)
 	return buffer;
 }
 
-/**
- * do_vfree - workqueue routine for freeing vmalloced memory
- * @work: data to be freed
- *
- * The work_struct is overlaid to the data being freed, as at the point
- * the work is scheduled the data is no longer valid, be its freeing
- * needs to be delayed until safe.
- */
-static void do_vfree(struct work_struct *work)
-{
-	vfree(work);
-}
-
 /**
  * kvfree - free an allocation do by kvmalloc
  * @buffer: buffer to free (MAYBE_NULL)
@@ -131,13 +118,8 @@ static void do_vfree(struct work_struct *work)
  */
 void kvfree(void *buffer)
 {
-	if (is_vmalloc_addr(buffer)) {
-		/* Data is no longer valid so just use the allocated space
-		 * as the work_struct
-		 */
-		struct work_struct *work = (struct work_struct *) buffer;
-		INIT_WORK(work, do_vfree);
-		schedule_work(work);
-	} else
+	if (is_vmalloc_addr(buffer))
+		vfree(buffer);
+	else
 		kfree(buffer);
 }