linux-kernel - Re: [PATCH] Staging: Android: logger: module

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Date:	Mon, 05 Nov 2012 10:57:11 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	Luca Clementi <luca.clementi@...il.com>
CC:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Brian Swetland <swetland@...gle.com>
Subject: Re: [PATCH] Staging: Android: logger: module_exit implementation

On 02/11/12 17:15, Luca Clementi wrote:
> Created the module_exit for the android logger so that
> it can be loaded and unloaded as a module. Fixed
> module_init and some other minor issues.
> 
> Signed-off-by: Luca Clementi <luca.clementi@...il.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Brian Swetland <swetland@...gle.com>
> ---
>  drivers/staging/android/logger.c |   30 +++++++++++++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
> index 1d5ed47..050be01 100644
> --- a/drivers/staging/android/logger.c
> +++ b/drivers/staging/android/logger.c
> @@ -676,4 +676,32 @@ static int __init logger_init(void)
>  out:
>  	return ret;
>  }
> -device_initcall(logger_init);
> +
> +static void __exit logger_exit(void)
> +{
> +	struct logger_log *current_log, *next_log;
> +
> +	list_for_each_entry_safe(current_log, next_log, &log_list, logs) {
> +		/* we have to delete all the entry inside log_list */
> +		ret = misc_deregister(&current_log->misc);

ret is undeclared? Has this been tested?

> +		if (unlikely(ret)) {
> +			pr_err("failed to deregister misc device for log '%s'!\n",
> +					current_log->misc.name);
> +		}

Don't need braces on single line if statements, and unlikely is not
needed here (it isn't a hotpath). The whole error can probably just be
removed since it looks like misc_deregister already does a WARN_ON if it
fails.

> +		pr_info("removed loggger '%s'\n", current_log->misc.name);

Don't spam the log with stuff like this. Either change to pr_debug, or
probably just remove it.

> +		vfree(current_log->buffer);
> +		kfree(current_log->misc.name);
> +		kfree(current_log);

Missing:

	list_del(&current_log->logs);

?

> +	}
> +
> +	return;

This is pointless.

> +}
> +
> +
> +module_init(logger_init);
> +module_exit(logger_exit);

Nitpick - Blank line here.

> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Brian Swetland, <swetland@...gle.com>");

Should be Robert Love according to the header comment.

> +MODULE_DESCRIPTION("Android Logger");
> +
> +

Don't need extra blank lines at the end of the file.

~Ryan

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