Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
  b43: fix comment typo reqest -> request
  Haavard Skinnemoen has left Atmel
  cris: typo in mach-fs Makefile
  Kconfig: fix copy/paste-ism for dell-wmi-aio driver
  doc: timers-howto: fix a typo ("unsgined")
  perf: Only include annotate.h once in tools/perf/util/ui/browsers/annotate.c
  md, raid5: Fix spelling error in comment ('Ofcourse' --> 'Of course').
  treewide: fix a few typos in comments
  regulator: change debug statement be consistent with the style of the rest
  Revert "arm: mach-u300/gpio: Fix mem_region resource size miscalculations"
  audit: acquire creds selectively to reduce atomic op overhead
  rtlwifi: don't touch with treewide double semicolon removal
  treewide: cleanup continuations and remove logging message whitespace
  ath9k_hw: don't touch with treewide double semicolon removal
  include/linux/leds-regulator.h: fix syntax in example code
  tty: fix typo in descripton of tty_termios_encode_baud_rate
  xtensa: remove obsolete BKL kernel option from defconfig
  m68k: fix comment typo 'occcured'
  arch:Kconfig.locks Remove unused config option.
  treewide: remove extra semicolons
  ...

3 files changed, 19 insertions, 12 deletions

diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index 88c92fb44618..5068e2a4e75f 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -199,4 +199,4 @@ config INLINE_WRITE_UNLOCK_IRQRESTORE
 	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 
 config MUTEX_SPIN_ON_OWNER
-	def_bool SMP && !DEBUG_MUTEXES && !HAVE_DEFAULT_NO_SPIN_MUTEXES
+	def_bool SMP && !DEBUG_MUTEXES
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index b33513a08beb..00d79df03e76 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -443,17 +443,25 @@ static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
 
 /* Determine if any context name data matches a rule's watch data */
 /* Compare a task_struct with an audit_rule.  Return 1 on match, 0
- * otherwise. */
+ * otherwise.
+ *
+ * If task_creation is true, this is an explicit indication that we are
+ * filtering a task rule at task creation time.  This and tsk == current are
+ * the only situations where tsk->cred may be accessed without an rcu read lock.
+ */
 static int audit_filter_rules(struct task_struct *tsk,
 			      struct audit_krule *rule,
 			      struct audit_context *ctx,
 			      struct audit_names *name,
-			      enum audit_state *state)
+			      enum audit_state *state,
+			      bool task_creation)
 {
-	const struct cred *cred = get_task_cred(tsk);
+	const struct cred *cred;
 	int i, j, need_sid = 1;
 	u32 sid;
 
+	cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
+
 	for (i = 0; i < rule->field_count; i++) {
 		struct audit_field *f = &rule->fields[i];
 		int result = 0;
@@ -637,10 +645,8 @@ static int audit_filter_rules(struct task_struct *tsk,
 			break;
 		}
 
-		if (!result) {
-			put_cred(cred);
+		if (!result)
 			return 0;
-		}
 	}
 
 	if (ctx) {
@@ -656,7 +662,6 @@ static int audit_filter_rules(struct task_struct *tsk,
 	case AUDIT_NEVER:    *state = AUDIT_DISABLED;	    break;
 	case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
 	}
-	put_cred(cred);
 	return 1;
 }
 
@@ -671,7 +676,8 @@ static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
-		if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) {
+		if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
+				       &state, true)) {
 			if (state == AUDIT_RECORD_CONTEXT)
 				*key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
 			rcu_read_unlock();
@@ -705,7 +711,7 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
 		list_for_each_entry_rcu(e, list, list) {
 			if ((e->rule.mask[word] & bit) == bit &&
 			    audit_filter_rules(tsk, &e->rule, ctx, NULL,
-					       &state)) {
+					       &state, false)) {
 				rcu_read_unlock();
 				ctx->current_state = state;
 				return state;
@@ -743,7 +749,8 @@ void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
 
 		list_for_each_entry_rcu(e, list, list) {
 			if ((e->rule.mask[word] & bit) == bit &&
-			    audit_filter_rules(tsk, &e->rule, ctx, n, &state)) {
+			    audit_filter_rules(tsk, &e->rule, ctx, n,
+				    	       &state, false)) {
 				rcu_read_unlock();
 				ctx->current_state = state;
 				return;
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index 0da058bff8eb..beb184689af9 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -385,7 +385,7 @@ static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
 	s32 value;
 	unsigned long flags;
 	struct pm_qos_object *o;
-	struct pm_qos_request_list *pm_qos_req = filp->private_data;;
+	struct pm_qos_request_list *pm_qos_req = filp->private_data;
 
 	if (!pm_qos_req)
 		return -EINVAL;