On Tuesday 09 March 2010, Thadeu Lima de Souza Cascardo wrote:
quoted text
>  MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
> @@ -1881,7 +1880,7 @@ static int input_open_file(struct inode *inode, struct file *file)
>         const struct file_operations *old_fops, *new_fops = NULL;
>         int err;
>  
> -       lock_kernel();
> +       mutex_lock(&input_mutex);
>         /* No load-on-demand here? */
>         handler = input_table[iminor(inode) >> 5];
>         if (!handler || !(new_fops = fops_get(handler->fops))) {
> @@ -1909,7 +1908,7 @@ static int input_open_file(struct inode *inode, struct file *file)
>         }
>         fops_put(old_fops);
>  out:
> -       unlock_kernel();
> +       mutex_unlock(&input_mutex);
>         return err;
>  }
>  
> -- 

Well, actually please have a look at
http://git.kernel.org/?p=linux/kernel/git/arnd/playground.git;a=commitdiff;h=c06fd0234...

* use mutex_lock_interruptible() where possible
* you probably don't want to hold input_mutex when calling into the lower
  device's open function

	Arnd
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