[PATCH] libertas: remove thread.h and make kthread usage clearer

Remove the thread.h abstractions and opencode kthread stuff
to make it clearer.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/cmd.c

@@ -1134,7 +1134,7 @@ int libertas_prepare_and_send_command(wlan_private * priv,
 		lbs_deb_cmd("PREP_CMD: No free cmdnode\n");
 
 		/* Wake up main thread to execute next command */
-		wake_up_interruptible(&priv->mainthread.waitq);
+		wake_up_interruptible(&priv->waitq);
 		ret = -1;
 		goto done;
 	}
@@ -1402,7 +1402,7 @@ int libertas_prepare_and_send_command(wlan_private * priv,
 
 	libertas_queue_cmd(adapter, cmdnode, 1);
 	adapter->nr_cmd_pending++;
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	if (wait_option & CMD_OPTION_WAITFORRSP) {
 		lbs_deb_cmd("PREP_CMD: Wait for CMD response\n");

drivers/net/wireless/libertas/debugfs.c

@@ -432,7 +432,7 @@ static ssize_t libertas_lowrssi_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -496,7 +496,7 @@ static u16 libertas_get_events_bitmap(wlan_private *priv)
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -575,7 +575,7 @@ static ssize_t libertas_lowrssi_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -628,7 +628,7 @@ static ssize_t libertas_lowsnr_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -727,7 +727,7 @@ static ssize_t libertas_lowsnr_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -781,7 +781,7 @@ static ssize_t libertas_failcount_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size =	cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -879,7 +879,7 @@ static ssize_t libertas_failcount_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -932,7 +932,7 @@ static ssize_t libertas_bcnmiss_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -1029,7 +1029,7 @@ static ssize_t libertas_bcnmiss_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -1082,7 +1082,7 @@ static ssize_t libertas_highrssi_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -1181,7 +1181,7 @@ static ssize_t libertas_highrssi_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -1232,7 +1232,7 @@ static ssize_t libertas_highsnr_read(struct file *file, char __user *userbuf,
 	event->action = cpu_to_le16(CMD_ACT_GET);
 	pcmdptr->size = cpu_to_le16(sizeof(*event) + S_DS_GEN);
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,
@@ -1331,7 +1331,7 @@ static ssize_t libertas_highsnr_write(struct file *file,
 	event->events = cpu_to_le16(event_bitmap);
 
 	libertas_queue_cmd(adapter, pcmdnode, 1);
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	/* Sleep until response is generated by FW */
 	wait_event_interruptible(pcmdnode->cmdwait_q,

drivers/net/wireless/libertas/dev.h

@@ -14,7 +14,6 @@
 
 #include "defs.h"
 #include "scan.h"
-#include "thread.h"
 
 extern struct ethtool_ops libertas_ethtool_ops;
 
@@ -146,7 +145,8 @@ struct _wlan_private {
 	struct device *hotplug_device;
 
 	/** thread to service interrupts */
-	struct wlan_thread mainthread;
+	struct task_struct *main_thread;
+	wait_queue_head_t waitq;
 
 	struct delayed_work assoc_work;
 	struct workqueue_struct *assoc_thread;

drivers/net/wireless/libertas/fw.c

@@ -341,7 +341,7 @@ static void command_timer_fn(unsigned long data)
 	lbs_deb_fw("re-sending same command because of timeout\n");
 	libertas_queue_cmd(adapter, ptempnode, 0);
 
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	return;
 }

drivers/net/wireless/libertas/if_usb.c

@@ -77,7 +77,7 @@ static void if_usb_write_bulk_callback(struct urb *urb)
 		priv->dnld_sent = DNLD_RES_RECEIVED;
 		/* Wake main thread if commands are pending */
 		if (!adapter->cur_cmd)
-			wake_up_interruptible(&priv->mainthread.waitq);
+			wake_up_interruptible(&priv->waitq);
 		if ((adapter->connect_status == LIBERTAS_CONNECTED)) {
 			netif_wake_queue(dev);
 			netif_wake_queue(priv->mesh_dev);

drivers/net/wireless/libertas/main.c

@@ -10,6 +10,7 @@
 #include <linux/etherdevice.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
+#include <linux/kthread.h>
 
 #include <net/iw_handler.h>
 #include <net/ieee80211.h>
@@ -438,7 +439,7 @@ static void wlan_tx_timeout(struct net_device *dev)
 			priv->adapter->eventcause = 0x01000000;
 			libertas_send_tx_feedback(priv);
 		} else
-			wake_up_interruptible(&priv->mainthread.waitq);
+			wake_up_interruptible(&priv->waitq);
 	} else if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
 		netif_wake_queue(priv->dev);
 		netif_wake_queue(priv->mesh_dev);
@@ -599,28 +600,25 @@ static void wlan_set_multicast_list(struct net_device *dev)
  *  @param data    A pointer to wlan_thread structure
  *  @return 	   0
  */
-static int wlan_service_main_thread(void *data)
+static int libertas_thread(void *data)
 {
-	struct wlan_thread *thread = data;
-	wlan_private *priv = thread->priv;
+	struct net_device *dev = data;
+	wlan_private *priv = dev->priv;
 	wlan_adapter *adapter = priv->adapter;
 	wait_queue_t wait;
 	u8 ireg = 0;
 
 	lbs_deb_enter(LBS_DEB_THREAD);
 
-	wlan_activate_thread(thread);
-
 	init_waitqueue_entry(&wait, current);
 
-	set_freezable();
 	for (;;) {
 		lbs_deb_thread( "main-thread 111: intcounter=%d "
 		       "currenttxskb=%p dnld_sent=%d\n",
 		       adapter->intcounter,
 		       adapter->currenttxskb, priv->dnld_sent);
 
-		add_wait_queue(&thread->waitq, &wait);
+		add_wait_queue(&priv->waitq, &wait);
 		set_current_state(TASK_INTERRUPTIBLE);
 		spin_lock_irq(&adapter->driver_lock);
 		if ((adapter->psstate == PS_STATE_SLEEP) ||
@@ -643,7 +641,7 @@ static int wlan_service_main_thread(void *data)
 		       adapter->currenttxskb, priv->dnld_sent);
 
 		set_current_state(TASK_RUNNING);
-		remove_wait_queue(&thread->waitq, &wait);
+		remove_wait_queue(&priv->waitq, &wait);
 		try_to_freeze();
 
 		lbs_deb_thread("main-thread 333: intcounter=%d currenttxskb=%p "
@@ -758,7 +756,6 @@ static int wlan_service_main_thread(void *data)
 	del_timer(&adapter->command_timer);
 	adapter->nr_cmd_pending = 0;
 	wake_up_all(&adapter->cmd_pending);
-	wlan_deactivate_thread(thread);
 
 	lbs_deb_leave(LBS_DEB_THREAD);
 	return 0;
@@ -841,10 +838,13 @@ int libertas_activate_card(wlan_private *priv, char *fw_name)
 
 	lbs_deb_enter(LBS_DEB_MAIN);
 
-	lbs_deb_thread("Starting kthread...\n");
-	priv->mainthread.priv = priv;
-	wlan_create_thread(wlan_service_main_thread,
-			   &priv->mainthread, "wlan_main_service");
+	lbs_deb_thread("Starting main thread...\n");
+	init_waitqueue_head(&priv->waitq);
+	priv->main_thread = kthread_run(libertas_thread, dev, "libertas_main");
+	if (IS_ERR(priv->main_thread)) {
+		lbs_deb_thread("Error creating main thread.\n");
+		goto done;
+	}
 
 	priv->assoc_thread =
 		create_singlethread_workqueue("libertas_assoc");
@@ -884,8 +884,8 @@ err_init_fw:
 err_registerdev:
 	destroy_workqueue(priv->assoc_thread);
 	/* Stop the thread servicing the interrupts */
-	wake_up_interruptible(&priv->mainthread.waitq);
-	wlan_terminate_thread(&priv->mainthread);
+	wake_up_interruptible(&priv->waitq);
+	kthread_stop(priv->main_thread);
 done:
 	lbs_deb_leave_args(LBS_DEB_NET, "ret %d", ret);
 	return ret;
@@ -1017,7 +1017,7 @@ int libertas_remove_card(wlan_private *priv)
 	adapter->surpriseremoved = 1;
 
 	/* Stop the thread servicing the interrupts */
-	wlan_terminate_thread(&priv->mainthread);
+	kthread_stop(priv->main_thread);
 
 	libertas_debugfs_remove_one(priv);
 
@@ -1151,7 +1151,7 @@ void libertas_interrupt(struct net_device *dev)
 		netif_wake_queue(priv->mesh_dev);
 	}
 
-	wake_up_interruptible(&priv->mainthread.waitq);
+	wake_up_interruptible(&priv->waitq);
 
 	lbs_deb_leave(LBS_DEB_THREAD);
 }

drivers/net/wireless/libertas/thread.h

@@ -1,52 +0,0 @@
-#ifndef	__WLAN_THREAD_H_
-#define	__WLAN_THREAD_H_
-
-#include	<linux/kthread.h>
-
-struct wlan_thread {
-	struct task_struct *task;
-	wait_queue_head_t waitq;
-	pid_t pid;
-	void *priv;
-};
-
-static inline void wlan_activate_thread(struct wlan_thread * thr)
-{
-	/** Record the thread pid */
-	thr->pid = current->pid;
-
-	/** Initialize the wait queue */
-	init_waitqueue_head(&thr->waitq);
-}
-
-static inline void wlan_deactivate_thread(struct wlan_thread * thr)
-{
-	lbs_deb_enter(LBS_DEB_THREAD);
-
-	thr->pid = 0;
-
-	lbs_deb_leave(LBS_DEB_THREAD);
-}
-
-static inline void wlan_create_thread(int (*wlanfunc) (void *),
-				      struct wlan_thread * thr, char *name)
-{
-	thr->task = kthread_run(wlanfunc, thr, "%s", name);
-}
-
-static inline int wlan_terminate_thread(struct wlan_thread * thr)
-{
-	lbs_deb_enter(LBS_DEB_THREAD);
-
-	/* Check if the thread is active or not */
-	if (!thr->pid) {
-		printk(KERN_ERR "Thread does not exist\n");
-		return -1;
-	}
-	kthread_stop(thr->task);
-
-	lbs_deb_leave(LBS_DEB_THREAD);
-	return 0;
-}
-
-#endif