rt2x00: Introduce tasklets for interrupt handling

No functional changes, just preparation for moving interrupt handling to
tasklets. The tasklets are disabled by default. Drivers making use of
them need to enable the tasklets when the device state is set to IRQ_ON.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00.h

@@ -520,6 +520,10 @@ struct rt2x00lib_ops {
 	 * TX status tasklet handler.
 	 */
 	void (*txstatus_tasklet) (unsigned long data);
+	void (*pretbtt_tasklet) (unsigned long data);
+	void (*tbtt_tasklet) (unsigned long data);
+	void (*rxdone_tasklet) (unsigned long data);
+	void (*autowake_tasklet) (unsigned long data);
 
 	/*
 	 * Device init handlers.
@@ -905,6 +909,15 @@ struct rt2x00_dev {
 	 * Tasklet for processing tx status reports (rt2800pci).
 	 */
 	struct tasklet_struct txstatus_tasklet;
+	struct tasklet_struct pretbtt_tasklet;
+	struct tasklet_struct tbtt_tasklet;
+	struct tasklet_struct rxdone_tasklet;
+	struct tasklet_struct autowake_tasklet;
+
+	/*
+	 * Protect the interrupt mask register.
+	 */
+	spinlock_t irqmask_lock;
 };
 
 /*

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -830,6 +830,26 @@ static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
 
 	}
 
+	/*
+	 * Initialize tasklets if used by the driver. Tasklets are
+	 * disabled until the interrupts are turned on. The driver
+	 * has to handle that.
+	 */
+#define RT2X00_TASKLET_INIT(taskletname) \
+	if (rt2x00dev->ops->lib->taskletname) { \
+		tasklet_init(&rt2x00dev->taskletname, \
+			     rt2x00dev->ops->lib->taskletname, \
+			     (unsigned long)rt2x00dev); \
+		tasklet_disable(&rt2x00dev->taskletname); \
+	}
+
+	RT2X00_TASKLET_INIT(pretbtt_tasklet);
+	RT2X00_TASKLET_INIT(tbtt_tasklet);
+	RT2X00_TASKLET_INIT(rxdone_tasklet);
+	RT2X00_TASKLET_INIT(autowake_tasklet);
+
+#undef RT2X00_TASKLET_INIT
+
 	/*
 	 * Register HW.
 	 */
@@ -958,6 +978,7 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
 {
 	int retval = -ENOMEM;
 
+	spin_lock_init(&rt2x00dev->irqmask_lock);
 	mutex_init(&rt2x00dev->csr_mutex);
 
 	set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);