rfkill: preserve state across suspend
The rfkill class API requires that the driver connected to a class
call rfkill_force_state() on resume to update the real state of the
rfkill controller, OR that it provides a get_state() hook.
This means there is potentially a hidden call in the resume code flow
that changes rfkill->state (i.e. rfkill_force_state()), so the
previous state of the transmitter was being lost.
The simplest and most future-proof way to fix this is to explicitly
store the pre-sleep state on the rfkill structure, and restore from
that on resume.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h
index 4cd64b0..f376a93 100644
--- a/include/linux/rfkill.h
+++ b/include/linux/rfkill.h
@@ -108,6 +108,7 @@
struct device dev;
struct list_head node;
+ enum rfkill_state state_for_resume;
};
#define to_rfkill(d) container_of(d, struct rfkill, dev)
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index ec26eae..5ad411d 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -565,10 +565,15 @@
#ifdef CONFIG_PM
static int rfkill_suspend(struct device *dev, pm_message_t state)
{
+ struct rfkill *rfkill = to_rfkill(dev);
+
/* mark class device as suspended */
if (dev->power.power_state.event != state.event)
dev->power.power_state = state;
+ /* store state for the resume handler */
+ rfkill->state_for_resume = rfkill->state;
+
return 0;
}
@@ -590,7 +595,7 @@
rfkill_toggle_radio(rfkill,
rfkill_epo_lock_active ?
RFKILL_STATE_SOFT_BLOCKED :
- rfkill->state,
+ rfkill->state_for_resume,
1);
mutex_unlock(&rfkill->mutex);
