swsusp: fix sysfs interface
The sysfs files /sys/power/disk and /sys/power/state do not work as
documented, since they allow the user to write only a few initial
characters of the input string to trigger the option (eg. 'echo pl >
/sys/power/disk' activates the platform mode of hibernation). Fix it.
Special thanks to Peter Moulder <Peter.Moulder@infotech.monash.edu.au> for
pointing out the problem.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b98b80c..8812985 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -290,13 +290,13 @@
len = p ? p - buf : n;
/* First, check if we are requested to hibernate */
- if (!strncmp(buf, "disk", len)) {
+ if (len == 4 && !strncmp(buf, "disk", len)) {
error = hibernate();
return error ? error : n;
}
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
- if (*s && !strncmp(buf, *s, len))
+ if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
if (state < PM_SUSPEND_MAX && *s)
