linux-kernel - Re: [PATCH] Cleanups for: line length, printk KERN_ argument, stack frame size > 2048 (added a kmalloc/kfree), style/formatting errors, incorrect include files

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Date:	Fri, 9 Oct 2009 14:29:19 -0700
From:	Bruce B <bbeare1@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Bill Pemberton <wfp5p@...ginia.edu>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Cleanups for: line length, printk KERN_ argument, stack frame size > 2048 (added a kmalloc/kfree), style/formatting errors, incorrect include files


On Oct 9, 2009, at 2:23 PM, Randy Dunlap wrote:

> On Fri,  9 Oct 2009 14:11:38 -0700 Bruce Beare wrote:
>
>> ---
>> drivers/staging/comedi/drivers/serial2002.c |  342 ++++++++++ 
>> +---------------
>> 1 files changed, 145 insertions(+), 197 deletions(-)
>>
>> diff --git a/drivers/staging/comedi/drivers/serial2002.c b/drivers/ 
>> staging/comedi/drivers/serial2002.c
>> index a219679..0232186 100644
>> --- a/drivers/staging/comedi/drivers/serial2002.c
>> +++ b/drivers/staging/comedi/drivers/serial2002.c
>> @@ -413,34 +408,37 @@ static void serial_2002_open(struct  
>> comedi_device *dev)
>> 			int min;
>> 			int max;
>> 		};
>> +		struct config_data_t {
>> +			struct config_t dig_in_config[32];
>> +			struct config_t dig_out_config[32];
>> +			struct config_t chan_in_config[32];
>> +			struct config_t chan_out_config[32];
>> +		} *config_data = NULL;
>>
>> -		struct config_t dig_in_config[32];
>> -		struct config_t dig_out_config[32];
>> -		struct config_t chan_in_config[32];
>> -		struct config_t chan_out_config[32];
>> 		int i;
>> +		config_data = kmalloc(sizeof(struct config_data_t), GFP_KERNEL);
>
> what happens when the kmalloc() fails??

Nothing good. The driver ignores the return code in numerous places  
and the open routine in this case is defined to be a void return.
I considered it to be a general cleanup subject for this driver at a  
later date.
>
>
>>
>> 		for (i = 0; i < 32; i++) {
>> -			dig_in_config[i].kind = 0;
>> -			dig_in_config[i].bits = 0;
>> -			dig_in_config[i].min = 0;
>> -			dig_in_config[i].max = 0;
>> -			dig_out_config[i].kind = 0;
>> -			dig_out_config[i].bits = 0;
>> -			dig_out_config[i].min = 0;
>> -			dig_out_config[i].max = 0;
>> -			chan_in_config[i].kind = 0;
>> -			chan_in_config[i].bits = 0;
>> -			chan_in_config[i].min = 0;
>> -			chan_in_config[i].max = 0;
>> -			chan_out_config[i].kind = 0;
>> -			chan_out_config[i].bits = 0;
>> -			chan_out_config[i].min = 0;
>> -			chan_out_config[i].max = 0;
>> +			config_data->dig_in_config[i].kind = 0;
>> +			config_data->dig_in_config[i].bits = 0;
>> +			config_data->dig_in_config[i].min = 0;
>> +			config_data->dig_in_config[i].max = 0;
>> +			config_data->dig_out_config[i].kind = 0;
>> +			config_data->dig_out_config[i].bits = 0;
>> +			config_data->dig_out_config[i].min = 0;
>> +			config_data->dig_out_config[i].max = 0;
>> +			config_data->chan_in_config[i].kind = 0;
>> +			config_data->chan_in_config[i].bits = 0;
>> +			config_data->chan_in_config[i].min = 0;
>> +			config_data->chan_in_config[i].max = 0;
>> +			config_data->chan_out_config[i].kind = 0;
>> +			config_data->chan_out_config[i].bits = 0;
>> +			config_data->chan_out_config[i].min = 0;
>> +			config_data->chan_out_config[i].max = 0;
>> 		}
>
>
> ---
> ~Randy

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