[PATCH] cowloop: fix deprecated kernel_thread() call

[Denis Kirjanov <kirjanov@gmail.com]

This fixes checkpatch warning about deprecated kernel_thread() call

Signed-off-by: Denis Kirjanov <kirjanov at gmail.com>
---
--- cowloop.c.orig	2009-09-18 21:11:46.000000000 +0400
+++ cowloop.c	2009-09-18 23:21:00.000000000 +0400
@@ -163,6 +163,7 @@ static char cowloop_version[] = "3.2";
 #include <linux/hdreg.h>
 #include <linux/genhd.h>
 #include <linux/statfs.h>
+#include <linux/kthread.h>
 
 #include "cowloop.h"
 
@@ -269,7 +270,7 @@ struct cowloop_device {
 	/*
 	** administration for interface with the kernel-thread
 	*/
-	int             pid;            /* pid==0: no thread available       */
+	struct task_struct	*cowd_task;   /* cowloop helper thread */
 	struct request  *req;           /* request to be handled now         */
 	wait_queue_head_t waitq;        /* wait-Q: thread waits for work     */
 	char            closedown;      /* boolean: thread exit required     */
@@ -859,7 +860,7 @@ cowlo_request(struct request_queue *q)
 		** when no kernel-thread is available, the request will
 		** produce an I/O-error
 		*/
-		if (!cowdev->pid) {
+		if (!cowdev->cowd_task) {
 			printk(KERN_ERR"cowloop - no thread available\n");
 			__blk_end_request_cur(req, -EIO); /* request failed */
 			cowdev->iobusy  = 0;
@@ -915,7 +916,7 @@ cowlo_daemon(struct cowloop_device *cowd
 		}
 
 		if (cowdev->closedown)          /* module will be unloaded ? */{
-			cowdev->pid = 0;
+			cowdev->cowd_task = NULL;
 			return 0;
 		}
 
@@ -1655,7 +1656,7 @@ cowlo_readproc(char *buf, char **start, 
 			cowdev->state & COWWATCHDOG  ? "watchdog "  : "",
 
 			cowdev->opencnt,
-			cowdev->pid,
+			cowdev->cowd_task->pid,
 			cowdev->rdoname,
 			cowdev->rdoreads,
 			cowdev->cowname,
@@ -1802,7 +1803,15 @@ cowlo_openpair(char *rdof, char *cowf, i
 	*/
 	DEBUGP(DCOW"cowloop - kickoff daemon....\n");
 
-	cowdev->pid = kernel_thread((int (*)(void *))cowlo_daemon, cowdev, 0);
+	cowdev->cowd_task = kthread_run((int (*)(void *))cowlo_daemon,
+			cowdev, "%s", "cowloopd");
+	if (IS_ERR(cowdev->cowd_task)) {
+		retval = PTR_ERR(cowdev->cowd_task);
+		printk(KERN_WARNING "cowloop: "
+				"Unable to start thread for device %d\n",
+				minor);
+		return retval;
+	}
 
 	/*
 	** create a file below directory /proc/cow for this new cowdevice
@@ -1880,7 +1889,7 @@ cowlo_closepair(struct cowloop_device *c
 	cowdev->qfilled   = 1;
 	wake_up_interruptible(&cowdev->waitq);
 
-	while (cowdev->pid)
+	while (cowdev->cowd_task)
 		schedule();
 
 	del_gendisk(cowdev->gd);  /* revert the alloc_disk() */