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swsusp: fix sysfs interface

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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>
This commit is contained in:
Rafael J. Wysocki 2007-05-16 22:11:19 -07:00 committed by Linus Torvalds
parent 7925409e20
commit 8d98a690f5
2 changed files with 4 additions and 3 deletions
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3
kernel/power/disk.c
View file

@ -416,7 +416,8 @@ static ssize_t disk_store(struct kset *kset, const char *buf, size_t n)
mutex_lock(&pm_mutex); mutex_lock(&pm_mutex);
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { 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; mode = i;
break; break;
} }

4
kernel/power/main.c
View file

@ -290,13 +290,13 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
len = p ? p - buf : n; len = p ? p - buf : n;
/* First, check if we are requested to hibernate */ /* First, check if we are requested to hibernate */
if (!strncmp(buf, "disk", len)) { if (len == 4 && !strncmp(buf, "disk", len)) {
error = hibernate(); error = hibernate();
return error ? error : n; return error ? error : n;
} }
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { 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; break;
} }
if (state < PM_SUSPEND_MAX && *s) if (state < PM_SUSPEND_MAX && *s)