diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-13 19:44:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-08 18:16:24 +0100 |
| commit | c2ab8958cfbfb65340877cfe45715bdd1efd2633 (patch) | |
| tree | 551687bbe057a9df7a49712eabb75ee9aad84aff /kernel | |
| parent | a312cbdb9045a52e5c1fec4ac7b86895f508dc76 (diff) | |
PM: wakeup: simplify the output logic of pm_show_wakelocks()
commit c9d967b2ce40d71e968eb839f36c936b8a9cf1ea upstream.
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.
Reviewed-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/wakelock.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c index dfba59be190b..b929b3963383 100644 --- a/kernel/power/wakelock.c +++ b/kernel/power/wakelock.c @@ -39,23 +39,19 @@ 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 |