[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>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index b4557fa30858..78f8bda81dae 100644
--- a/drivers/s390/char/fs3270.c
+++ b/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);