[PATCH] s390: update fs3270 to use a struct pid

Replaces the pid_t value with a struct pid to avoid pid wrap around
problems.
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/s390/char/fs3270.c

@@ -27,7 +27,7 @@ struct raw3270_fn fs3270_fn;
 
 struct fs3270 {
 	struct raw3270_view view;
-	pid_t fs_pid;			/* Pid of controlling program. */
+	struct pid *fs_pid;		/* Pid of controlling program. */
 	int read_command;		/* ccw command to use for reads. */
 	int write_command;		/* ccw command to use for writes. */
 	int attention;			/* Got attention. */
@@ -102,7 +102,7 @@ fs3270_restore_callback(struct raw3270_request *rq, void *data)
 	fp = (struct fs3270 *) rq->view;
 	if (rq->rc != 0 || rq->rescnt != 0) {
 		if (fp->fs_pid)
-			kill_proc(fp->fs_pid, SIGHUP, 1);
+			kill_pid(fp->fs_pid, SIGHUP, 1);
 	}
 	fp->rdbuf_size = 0;
 	raw3270_request_reset(rq);
@@ -173,7 +173,7 @@ fs3270_save_callback(struct raw3270_request *rq, void *data)
 	 */
 	if (rq->rc != 0 || rq->rescnt == 0) {
 		if (fp->fs_pid)
-			kill_proc(fp->fs_pid, SIGHUP, 1);
+			kill_pid(fp->fs_pid, SIGHUP, 1);
 		fp->rdbuf_size = 0;
 	} else
 		fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
@@ -442,7 +442,7 @@ fs3270_open(struct inode *inode, struct file *filp)
 		return PTR_ERR(fp);
 
 	init_waitqueue_head(&fp->wait);
-	fp->fs_pid = current->pid;
+	fp->fs_pid = get_pid(task_pid(current));
 	rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
 	if (rc) {
 		fs3270_free_view(&fp->view);
@@ -480,7 +480,8 @@ fs3270_close(struct inode *inode, struct file *filp)
 	fp = filp->private_data;
 	filp->private_data = NULL;
 	if (fp) {
-		fp->fs_pid = 0;
+		put_pid(fp->fs_pid);
+		fp->fs_pid = NULL;
 		raw3270_reset(&fp->view);
 		raw3270_put_view(&fp->view);
 		raw3270_del_view(&fp->view);