linux-kernel - [PATCH 8/9] power: wakeup: Add missing annotation for wakeup_sources_stats_seq_start() and wakeup_sources_stats_seq

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Date:   Sat, 11 Apr 2020 01:19:32 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     boqun.feng@...il.com, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org (open list:HIBERNATION (aka Software Suspend,
        aka swsusp))
Subject: [PATCH 8/9] power: wakeup: Add missing annotation for wakeup_sources_stats_seq_start() and wakeup_sources_stats_seq_stop()

Sparse reports warnings at wakeup_sources_stats_seq_start()
	and wakeup_sources_stats_seq_stop()

warning: context imbalance in wakeup_sources_stats_seq_start()
	- wrong count at exit
context imbalance in wakeup_sources_stats_seq_stop()
	- unexpected unlock

The root cause is the missing annotation at
wakeup_sources_stats_seq_start() and wakeup_sources_stats_seq_stop()

Add the missing  __acquires(&wakeup_srcu) annotation
Add the missing __releases(&wakeup_srcu) annotation

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 drivers/base/power/wakeup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 27f3e60608e5..41ce086d8f57 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -1092,6 +1092,7 @@ static int print_wakeup_source_stats(struct seq_file *m,
 
 static void *wakeup_sources_stats_seq_start(struct seq_file *m,
 					loff_t *pos)
+	__acquires(&wakeup_srcu)
 {
 	struct wakeup_source *ws;
 	loff_t n = *pos;
@@ -1132,6 +1133,7 @@ static void *wakeup_sources_stats_seq_next(struct seq_file *m,
 }
 
 static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
+	__releases(&wakeup_srcu)
 {
 	int *srcuidx = m->private;
 
-- 
2.24.1