rt2x00: Add suspend/resume handlers to rt2x00rfkill

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@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 75 insertions, 41 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00rfkill.c b/drivers/net/wireless/rt2x00/rt2x00rfkill.c
index 34a96d44e306..f95577596206 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;
+        }
 }