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dtlk: fix error checks in module_init()

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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>
This commit is contained in:
Akinobu Mita 2007-05-08 00:29:18 -07:00 committed by Linus Torvalds
parent 19d0e8ce85
commit b2bbe383ef
1 changed files with 10 additions and 4 deletions
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12
drivers/char/dtlk.c
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@ -324,15 +324,21 @@ 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);
init_waitqueue_head(&dtlk_process_list);