[POWERPC] Convert therm_windtunnel.c to use the kthread API

This is fairly straightforward, and lets us get rid of x.completion
as well.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index 5452da1..3722402 100644 (file)
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -36,6 +36,7 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/init.h>
+#include <linux/kthread.h>
 
 #include <asm/prom.h>
 #include <asm/machdep.h>
@@ -61,8 +62,7 @@ I2C_CLIENT_INSMOD;
 
 static struct {
        volatile int            running;
-       struct completion       completion;
-       pid_t                   poll_task;
+       struct task_struct      *poll_task;
        
        struct semaphore        lock;
        struct of_device        *of_dev;
@@ -282,27 +282,27 @@ restore_regs( void )
        write_reg( x.fan, 0x00, x.r0, 1 );
 }
 
-static int
-control_loop( void *dummy )
+static int control_loop(void *dummy)
 {
-       daemonize("g4fand");
-
-       down( &x.lock );
+       down(&x.lock);
        setup_hardware();
+       up(&x.lock);
 
-       while( x.running ) {
-               up( &x.lock );
-
+       for (;;) {
                msleep_interruptible(8000);
-               
-               down( &x.lock );
+               if (kthread_should_stop())
+                       break;
+
+               down(&x.lock);
                poll_temp();
+               up(&x.lock);
        }
 
+       down(&x.lock);
        restore_regs();
-       up( &x.lock );
+       up(&x.lock);
 
-       complete_and_exit( &x.completion, 0 );
+       return 0;
 }
 
 
@@ -322,8 +322,7 @@ do_attach( struct i2c_adapter *adapter )
                ret = i2c_probe( adapter, &addr_data, &do_probe );
                if( x.thermostat && x.fan ) {
                        x.running = 1;
-                       init_completion( &x.completion );
-                       x.poll_task = kernel_thread( control_loop, NULL, SIGCHLD | CLONE_KERNEL );
+                       x.poll_task = kthread_run(control_loop, NULL, "g4fand");
                }
        }
        return ret;
@@ -339,7 +338,8 @@ do_detach( struct i2c_client *client )
        else {
                if( x.running ) {
                        x.running = 0;
-                       wait_for_completion( &x.completion );
+                       kthread_stop(x.poll_task);
+                       x.poll_task = NULL;
                }
                if( client == x.thermostat )
                        x.thermostat = NULL;