dtlk: fix error checks in module_init()

This patch fixes two things in module_init.

- fix register_chrdev() error check

  Currently dtlk doesn't check register_chrdev() failure correctly.
  register_chrdev() returns a errno on failure.

- check probe failure

  dtlk ignores probe failure and allows the module loading without
  such device. I got "Trying to free nonexistent resource" message
  by release_region() when unloading module without device.

[akpm@linux-foundation.org: fix error code return]
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Chris Pallotta <chris@allmedia.com>
Cc: Jim Van Zandt <jrv@vanzandt.mv.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index 9695f88badc6..abde6ddefe69 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -324,16 +324,22 @@ static int dtlk_release(struct inode *inode, struct file *file)
 
 static int __init dtlk_init(void)
 {
+        int err;
+
         dtlk_port_lpc = 0;
         dtlk_port_tts = 0;
         dtlk_busy = 0;
         dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops);
-        if (dtlk_major == 0) {
+        if (dtlk_major < 0) {
                 printk(KERN_ERR "DoubleTalk PC - cannot register device\n");
-                return 0;
+                return dtlk_major;
+        }
+        err = dtlk_dev_probe();
+        if (err) {
+                unregister_chrdev(dtlk_major, "dtlk");
+                return err;
         }
-        if (dtlk_dev_probe() == 0)
-                printk(", MAJOR %d\n", dtlk_major);
+        printk(", MAJOR %d\n", dtlk_major);
 
         init_waitqueue_head(&dtlk_process_list);