提交 b2bbe383 编写于 作者: A Akinobu Mita 提交者: Linus Torvalds

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: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Chris Pallotta <chris@allmedia.com>
Cc: Jim Van Zandt <jrv@vanzandt.mv.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 19d0e8ce
...@@ -324,16 +324,22 @@ static int dtlk_release(struct inode *inode, struct file *file) ...@@ -324,16 +324,22 @@ static int dtlk_release(struct inode *inode, struct file *file)
static int __init dtlk_init(void) static int __init dtlk_init(void)
{ {
int err;
dtlk_port_lpc = 0; dtlk_port_lpc = 0;
dtlk_port_tts = 0; dtlk_port_tts = 0;
dtlk_busy = 0; dtlk_busy = 0;
dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops); 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"); 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); init_waitqueue_head(&dtlk_process_list);
......
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