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Subject[linux-pm][PATCH] base: Change power/wakeup output from "" to "unsupported" if wakeup feature isn't supported by a device
If a device can't support wakeup, its /sys/devices/.../power/wakeup output is
empty, this is confusing, a user doesn't know if it supports wakeup feature
unless he/she read the ralated source code, for this case, it is more
reasonable to output "unsupported". Otherwise, no matter what value the user
sets to /sys/devices/.../power/wakeup, the result is the same: Invalid argument,
so the user doesn't know why.

This patch changes empty output to "unsupported" in order that a user knows
wakeup feature isn't supported by this device when he/she
'cat /sys/devices/.../power/wakeup', please consider to apply, thanks.

Signed-off-by: Yi Yang <>
sysfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/power/sysfs.c 2008-01-04 16:50:54.000000000 +0800
+++ b/drivers/base/power/sysfs.c 2008-01-04 17:14:42.000000000 +0800
@@ -49,7 +49,7 @@ wake_show(struct device * dev, struct de
return sprintf(buf, "%s\n", device_can_wakeup(dev)
? (device_may_wakeup(dev) ? enabled : disabled)
- : "");
+ : "unsupported");

static ssize_t

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