[PATCH] PM / wakeup: use seq_open() to show wakeup stats

[Ganesh Mahendran <opensource.ganesh@gmail.com>]

single_open() interface requires that the whole output must
fit into a single buffer. This will lead to timeout when
system memory is not in a good situation.

This patch use seq_open() to show wakeup stats. This method
need only one page, so timeout will not be observed.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
---
 drivers/base/power/wakeup.c | 71 +++++++++++++++++++++++++++++++++++----------
 1 file changed, 56 insertions(+), 15 deletions(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index ea01621..c64609a 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -1029,32 +1029,73 @@ static int print_wakeup_source_stats(struct seq_file *m,
 	return 0;
 }
 
+static void *wakeup_sources_stats_seq_start(struct seq_file *m,
+					loff_t *pos)
+{
+	struct wakeup_source *ws;
+	loff_t n = *pos;
+
+	if (n == 0) {
+		seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
+			"expire_count\tactive_since\ttotal_time\tmax_time\t"
+			"last_change\tprevent_suspend_time\n");
+	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
+		if (n-- > 0)
+			continue;
+		goto out;
+	}
+	ws = NULL;
+out:
+	return ws;
+}
+
+static void *wakeup_sources_stats_seq_next(struct seq_file *m,
+					void *v, loff_t *pos)
+{
+	struct wakeup_source *ws = v;
+	struct wakeup_source *next_ws = NULL;
+
+	++(*pos);
+
+	list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) {
+		next_ws = ws;
+		break;
+	}
+
+	return next_ws;
+}
+
+static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
+{
+	rcu_read_unlock();
+}
+
 /**
  * wakeup_sources_stats_show - Print wakeup sources statistics information.
  * @m: seq_file to print the statistics into.
  */
-static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
+static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v)
 {
-	struct wakeup_source *ws;
-	int srcuidx;
+	struct wakeup_source *ws = v;
 
-	seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
-		"expire_count\tactive_since\ttotal_time\tmax_time\t"
-		"last_change\tprevent_suspend_time\n");
-
-	srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry)
-		print_wakeup_source_stats(m, ws);
-	srcu_read_unlock(&wakeup_srcu, srcuidx);
-
-	print_wakeup_source_stats(m, &deleted_ws);
+	print_wakeup_source_stats(m, ws);
 
 	return 0;
 }
 
+static const struct seq_operations wakeup_sources_stats_seq_ops = {
+	.start = wakeup_sources_stats_seq_start,
+	.next  = wakeup_sources_stats_seq_next,
+	.stop  = wakeup_sources_stats_seq_stop,
+	.show  = wakeup_sources_stats_seq_show,
+};
+
 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, wakeup_sources_stats_show, NULL);
+	return seq_open(file, &wakeup_sources_stats_seq_ops);
 }
 
 static const struct file_operations wakeup_sources_stats_fops = {
@@ -1062,7 +1103,7 @@ static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
 	.open = wakeup_sources_stats_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
-	.release = single_release,
+	.release = seq_release,
 };
 
 static int __init wakeup_sources_debugfs_init(void)
-- 
1.9.1