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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-01-13 19:44:20 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2022-01-25 18:27:02 +0100
commitc9d967b2ce40d71e968eb839f36c936b8a9cf1ea (patch)
treed512366764e954e24966fd7faaae306d6bf23d49
parente783362eb54cd99b2cac8b3a9aeac942e6f6ac07 (diff)
PM: wakeup: simplify the output logic of pm_show_wakelocks()
The buffer handling in pm_show_wakelocks() is tricky, and hopefully correct. Ensure it really is correct by using sysfs_emit_at() which handles all of the tricky string handling logic in a PAGE_SIZE buffer for us automatically as this is a sysfs file being read from. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--kernel/power/wakelock.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c
index 105df4dfc783..52571dcad768 100644
--- a/kernel/power/wakelock.c
+++ b/kernel/power/wakelock.c
@@ -39,23 +39,20 @@ ssize_t pm_show_wakelocks(char *buf, bool show_active)
{
struct rb_node *node;
struct wakelock *wl;
- char *str = buf;
- char *end = buf + PAGE_SIZE;
+ int len = 0;
mutex_lock(&wakelocks_lock);
for (node = rb_first(&wakelocks_tree); node; node = rb_next(node)) {
wl = rb_entry(node, struct wakelock, node);
if (wl->ws->active == show_active)
- str += scnprintf(str, end - str, "%s ", wl->name);
+ len += sysfs_emit_at(buf, len, "%s ", wl->name);
}
- if (str > buf)
- str--;
- str += scnprintf(str, end - str, "\n");
+ len += sysfs_emit_at(buf, len, "\n");
mutex_unlock(&wakelocks_lock);
- return (str - buf);
+ return len;
}
#if CONFIG_PM_WAKELOCKS_LIMIT > 0