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authorRafael J. Wysocki <rjw@sisk.pl>2007-05-16 22:11:19 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-17 05:23:05 -0700
commit8d98a690f58e0d6ecf424b7ca84488475cf87bd9 (patch)
tree09adca50773f465b75fc04682377bfaa40c72876
parent7925409e202a41176b729671eab6e610a54153cd (diff)
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>
-rw-r--r--kernel/power/disk.c3
-rw-r--r--kernel/power/main.c4
2 files changed, 4 insertions, 3 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index b5f0543ed84..f445b9cd60f 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -416,7 +416,8 @@ static ssize_t disk_store(struct kset *kset, const char *buf, size_t n)
mutex_lock(&pm_mutex);
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
- if (!strncmp(buf, hibernation_modes[i], len)) {
+ if (len == strlen(hibernation_modes[i])
+ && !strncmp(buf, hibernation_modes[i], len)) {
mode = i;
break;
}
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b98b80ccf43..8812985f302 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -290,13 +290,13 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
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)