Add suspend/resume handlers to rt2x00rfkill to have it stop
the input-polldev and prevent it from calling rt2x00 during
suspend period. This could lead to a NULL pointer fault when
rt2x00 suspended, but polldev send a request, because
the csr_addr is NULL.
Also don't let the rfkill allocation/registration block
the initialization of the entire device. Just print a warning
and continue as if nothing happened.
Signed-off-by: Ivo van Doorn <IvDoorn@xxxxxxxxx>
---
John, this patch was send as part of the rt2x00 2.1.4 release for the 2.6.26 kernel.
Kernel bug [9585] however indicates this patch is also needed for 2.6.25 to fix
a segmentation fault during resume.
Due to the presence of LED classes in rt2x00 2.1.*,
the original patch won't apply cleanly against the 2.6.25 tree,
so this is an updated patch for 2.6.25 only.
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 05927b9..6c72542 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -620,6 +620,9 @@ struct rt2x00_dev {
* This will only be compiled in when required.
*/
#ifdef CONFIG_RT2X00_LIB_RFKILL
+unsigned long rfkill_state;
+#define RFKILL_STATE_ALLOCATED 1
+#define RFKILL_STATE_REGISTERED 2
struct rfkill *rfkill;
struct input_polled_dev *poll_dev;
#endif /* CONFIG_RT2X00_LIB_RFKILL */
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 0d51f47..bc846ba 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -1098,7 +1098,7 @@ static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
return;
/*
- * Unregister rfkill.
+ * Unregister extra components.
*/
rt2x00rfkill_unregister(rt2x00dev);
@@ -1139,11 +1139,9 @@ static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
__set_bit(DEVICE_INITIALIZED, &rt2x00dev->flags);
/*
- * Register the rfkill handler.
+ * Register the extra components.
*/
- status = rt2x00rfkill_register(rt2x00dev);
- if (status)
- goto exit_unitialize;
+ rt2x00rfkill_register(rt2x00dev);
return 0;
@@ -1313,15 +1311,9 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
}
/*
- * Allocatie rfkill.
- */
- retval = rt2x00rfkill_allocate(rt2x00dev);
- if (retval)
- goto exit;
-
- /*
- * Open the debugfs entry.
+ * Register extra components.
*/
+ rt2x00rfkill_allocate(rt2x00dev);
rt2x00debug_register(rt2x00dev);
__set_bit(DEVICE_PRESENT, &rt2x00dev->flags);
@@ -1350,13 +1342,9 @@ void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
rt2x00lib_uninitialize(rt2x00dev);
/*
- * Close debugfs entry.
+ * Free extra components
*/
rt2x00debug_deregister(rt2x00dev);
-
- /*
- * Free rfkill
- */
rt2x00rfkill_free(rt2x00dev);
/*
@@ -1395,11 +1383,15 @@ int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
__set_bit(DEVICE_STARTED_SUSPEND, &rt2x00dev->flags);
/*
- * Disable radio and unitialize all items
- * that must be recreated on resume.
+ * Disable radio.
*/
rt2x00lib_stop(rt2x00dev);
rt2x00lib_uninitialize(rt2x00dev);
+
+ /*
+ * Suspend/disable extra components.
+ */
+ rt2x00rfkill_suspend(rt2x00dev);
rt2x00debug_deregister(rt2x00dev);
exit:
@@ -1422,9 +1414,10 @@ int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
NOTICE(rt2x00dev, "Waking up.\n");
/*
- * Open the debugfs entry.
+ * Restore/enable extra components.
*/
rt2x00debug_register(rt2x00dev);
+ rt2x00rfkill_resume(rt2x00dev);
/*
* Only continue if mac80211 had open interfaces.
diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h
index 1adbd28..ce58c65 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -100,28 +100,36 @@ static inline void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
* RFkill handlers.
*/
#ifdef CONFIG_RT2X00_LIB_RFKILL
-int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev);
+void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev);
void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev);
-int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev);
+void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev);
void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev);
+void rt2x00rfkill_suspend(struct rt2x00_dev *rt2x00dev);
+void rt2x00rfkill_resume(struct rt2x00_dev *rt2x00dev);
#else
-static inline int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
+static inline void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
{
- return 0;
}
static inline void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
{
}
-static inline int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
+static inline void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
{
- return 0;
}
static inline void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
{
}
+
+static inline void rt2x00rfkill_suspend(struct rt2x00_dev *rt2x00dev)
+{
+}
+
+static inline void rt2x00rfkill_resume(struct rt2x00_dev *rt2x00dev)
+{
+}
#endif /* CONFIG_RT2X00_LIB_RFKILL */
#endif /* RT2X00LIB_H */
diff --git a/drivers/net/wireless/rt2x00/rt2x00rfkill.c b/drivers/net/wireless/rt2x00/rt2x00rfkill.c
index 34a96d4..f955775 100644
--- a/drivers/net/wireless/rt2x00/rt2x00rfkill.c
+++ b/drivers/net/wireless/rt2x00/rt2x00rfkill.c
@@ -69,56 +69,81 @@ static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
}
}
-int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
+void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
{
- int retval;
-
- if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
- return 0;
+ if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
+ !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
+ return;
- retval = rfkill_register(rt2x00dev->rfkill);
- if (retval) {
+ if (rfkill_register(rt2x00dev->rfkill)) {
ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
- return retval;
+ return;
}
- retval = input_register_polled_device(rt2x00dev->poll_dev);
- if (retval) {
+ if (input_register_polled_device(rt2x00dev->poll_dev)) {
ERROR(rt2x00dev, "Failed to register polled device.\n");
rfkill_unregister(rt2x00dev->rfkill);
- return retval;
+ return;
}
+ __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
+
/*
* Force initial poll which will detect the initial device state,
* and correctly sends the signal to the rfkill layer about this
* state.
*/
rt2x00rfkill_poll(rt2x00dev->poll_dev);
-
- return 0;
}
void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
{
- if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
+ if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
+ !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
return;
input_unregister_polled_device(rt2x00dev->poll_dev);
rfkill_unregister(rt2x00dev->rfkill);
+
+ __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
}
-int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
+static struct input_polled_dev *
+rt2x00rfkill_allocate_polldev(struct rt2x00_dev *rt2x00dev)
{
- struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
+ struct input_polled_dev *poll_dev;
+
+ poll_dev = input_allocate_polled_device();
+ if (!poll_dev)
+ return NULL;
+
+ poll_dev->private = rt2x00dev;
+ poll_dev->poll = rt2x00rfkill_poll;
+ poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
+
+ poll_dev->input->name = rt2x00dev->ops->name;
+ poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
+ poll_dev->input->id.bustype = BUS_HOST;
+ poll_dev->input->id.vendor = 0x1814;
+ poll_dev->input->id.product = rt2x00dev->chip.rt;
+ poll_dev->input->id.version = rt2x00dev->chip.rev;
+ poll_dev->input->dev.parent = wiphy_dev(rt2x00dev->hw->wiphy);
+ poll_dev->input->evbit[0] = BIT(EV_KEY);
+ set_bit(KEY_WLAN, poll_dev->input->keybit);
+
+ return poll_dev;
+}
+void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
+{
if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
- return 0;
+ return;
- rt2x00dev->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
+ rt2x00dev->rfkill =
+ rfkill_allocate(wiphy_dev(rt2x00dev->hw->wiphy), RFKILL_TYPE_WLAN);
if (!rt2x00dev->rfkill) {
ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
- goto exit;
+ return;
}
rt2x00dev->rfkill->name = rt2x00dev->ops->name;
@@ -126,40 +151,49 @@ int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
rt2x00dev->rfkill->state = -1;
rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
- rt2x00dev->poll_dev = input_allocate_polled_device();
+ rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
if (!rt2x00dev->poll_dev) {
ERROR(rt2x00dev, "Failed to allocate polled device.\n");
- goto exit_free_rfkill;
+ rfkill_free(rt2x00dev->rfkill);
+ rt2x00dev->rfkill = NULL;
+ return;
}
- rt2x00dev->poll_dev->private = rt2x00dev;
- rt2x00dev->poll_dev->poll = rt2x00rfkill_poll;
- rt2x00dev->poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
+ return;
+}
- rt2x00dev->poll_dev->input->name = rt2x00dev->ops->name;
- rt2x00dev->poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
- rt2x00dev->poll_dev->input->id.bustype = BUS_HOST;
- rt2x00dev->poll_dev->input->id.vendor = 0x1814;
- rt2x00dev->poll_dev->input->id.product = rt2x00dev->chip.rt;
- rt2x00dev->poll_dev->input->id.version = rt2x00dev->chip.rev;
- rt2x00dev->poll_dev->input->dev.parent = device;
- rt2x00dev->poll_dev->input->evbit[0] = BIT(EV_KEY);
- set_bit(KEY_WLAN, rt2x00dev->poll_dev->input->keybit);
+void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
+{
+ if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
+ !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
+ return;
- return 0;
+ input_free_polled_device(rt2x00dev->poll_dev);
+ rt2x00dev->poll_dev = NULL;
-exit_free_rfkill:
rfkill_free(rt2x00dev->rfkill);
-
-exit:
- return -ENOMEM;
+ rt2x00dev->rfkill = NULL;
}
-void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
+void rt2x00rfkill_suspend(struct rt2x00_dev *rt2x00dev)
{
- if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
+ if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
+ !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
return;
input_free_polled_device(rt2x00dev->poll_dev);
- rfkill_free(rt2x00dev->rfkill);
+ rt2x00dev->poll_dev = NULL;
+}
+
+void rt2x00rfkill_resume(struct rt2x00_dev *rt2x00dev)
+{
+ if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
+ !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
+ return;
+
+ rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
+ if (!rt2x00dev->poll_dev) {
+ ERROR(rt2x00dev, "Failed to allocate polled device.\n");
+ return;
+ }
}
--
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