linux-kernel - Re: [PATCH 2/4] staging: sep: No else is necessary after a break (reported by checkpatch)

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Message-ID: <53CB6433.8010205@gmail.com>
Date:	Sun, 20 Jul 2014 08:39:47 +0200
From:	Corentin LABBE <clabbe.montjoie@...il.com>
To:	Joe Perches <joe@...ches.com>, mark.a.allyn@...el.com,
	jayant.mangalampalli@...el.com
CC:	gregkh@...uxfoundation.org, monamagarwal123@...il.com,
	paul.gortmaker@...driver.com, jg1.han@...sung.com,
	paulmck@...ux.vnet.ibm.com, valentina.manea.m@...il.com,
	jack@...e.cz, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] staging: sep: No else is necessary after a break
 (reported by checkpatch)

Le 19/07/2014 20:00, Joe Perches a écrit :
> (Adding Mark Allyn and Jayant Mangalampalli)
> 
> Is this still project still active?

I do not know

> 
> On Sat, 2014-07-19 at 19:34 +0200, LABBE Corentin wrote:
>> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
>> ---
>>  drivers/staging/sep/sep_main.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/staging/sep/sep_main.c b/drivers/staging/sep/sep_main.c
>> index 177e4b9..1580d95f 100644
>> --- a/drivers/staging/sep/sep_main.c
>> +++ b/drivers/staging/sep/sep_main.c
>> @@ -2881,12 +2881,11 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
>>  				if (is_kva) {
>>  					error = -ENODEV;
>>  					break;
>> -				} else {
>> -					error_temp = copy_to_user(
>> +				}
>> +				error_temp = copy_to_user(
>>  						(void __user *)tail_pt,
>>  						dcb_table_ptr->tail_data,
>>  						dcb_table_ptr->tail_data_size);
>> -				}
>>  				if (error_temp) {
>>  					/* Release the DMA resource */
>>  					error = -EFAULT;
> 
> It'd be probably be better to rewrite the code to unindent
> a level by using continue.  Something like below:
> 
> btw:
> 
> the is_kva test looks very odd and should probably be
> moved outside the loop.
> 
> pt_hold should probably be void * not unsigned long
> as it loses high order bits on x86-32.
> 
> definition:
> 	aligned_u64 out_vr_tail_pt;
> use:
> +			pt_hold = (unsigned long)dcb_table_ptr->
> +				out_vr_tail_pt;
> 

As I said in the introduction email, I have done thoses patch for the Eudyptula challenge,
since I have not the hardware needed by this driver I cannot modify beyond simple style changes without testing

Regards


> ---
>  drivers/staging/sep/sep_main.c | 37 +++++++++++++++++--------------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/staging/sep/sep_main.c b/drivers/staging/sep/sep_main.c
> index 75ca15e..24b4a54 100644
> --- a/drivers/staging/sep/sep_main.c
> +++ b/drivers/staging/sep/sep_main.c
> @@ -2871,26 +2871,23 @@ static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
>  		 * Go over each DCB and see if
>  		 * tail pointer must be updated
>  		 */
> -		for (i = 0; i < (*dma_ctx)->nr_dcb_creat;
> -		     i++, dcb_table_ptr++) {
> -			if (dcb_table_ptr->out_vr_tail_pt) {
> -				pt_hold = (unsigned long)dcb_table_ptr->
> -					out_vr_tail_pt;
> -				tail_pt = (void *)pt_hold;
> -				if (is_kva) {
> -					error = -ENODEV;
> -					break;
> -				} else {
> -					error_temp = copy_to_user(
> -						(void __user *)tail_pt,
> -						dcb_table_ptr->tail_data,
> -						dcb_table_ptr->tail_data_size);
> -				}
> -				if (error_temp) {
> -					/* Release the DMA resource */
> -					error = -EFAULT;
> -					break;
> -				}
> +		for (i = 0; i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
> +			if (!dcb_table_ptr->out_vr_tail_pt)
> +				continue;
> +			pt_hold = (unsigned long)dcb_table_ptr->
> +				out_vr_tail_pt;
> +			tail_pt = (void *)pt_hold;
> +			if (is_kva) {
> +				error = -ENODEV;
> +				break;
> +			}
> +			error_temp = copy_to_user((void __user *)tail_pt,
> +						  dcb_table_ptr->tail_data,
> +						  dcb_table_ptr->tail_data_size);
> +			if (error_temp) {
> +				/* Release the DMA resource */
> +				error = -EFAULT;
> +				break;
>  			}
>  		}
>  	}
> 
> 

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