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 14:31:24 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Bruce B <bbeare1@...il.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 Fri, 9 Oct 2009 14:29:19 -0700 Bruce B wrote:

> 
> 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.

I would say sooner than later.

> >>
> >> 		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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