linux-kernel - Re: [PATCH 09/11] spi-dw: Fix condition in spi_dw

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Date:	Wed, 22 Jun 2011 20:09:34 -0700
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Feng Tang <feng.tang@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"spi-devel-general@...ts.sourceforge.net" 
	<spi-devel-general@...ts.sourceforge.net>
Subject: Re: [PATCH 09/11] spi-dw: Fix condition in spi_dw_{writer/reader}

On 06/22/2011 07:45 PM, Feng Tang wrote:
> On Thu, 23 Jun 2011 10:00:11 +0800
> "dirk.brandewie@...il.com"<dirk.brandewie@...il.com>  wrote:
>
>> From: Dirk Brandewie<dirk.brandewie@...il.com>
>>
>> Fix the condition based on whether the current transfer has a tx/rx
>> buffer.
>>
>> Signed-off-by: Dirk Brandewie<dirk.brandewie@...il.com>
>> ---
>>   drivers/spi/spi-dw.c |    6 +++---
>>   1 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
>> index cc38aa0..35b952b 100644
>> --- a/drivers/spi/spi-dw.c
>> +++ b/drivers/spi/spi-dw.c
>> @@ -193,8 +193,8 @@ static void spi_dw_writer(struct spi_dw *dws)
>>   	u16 txw = 0;
>>
>>   	while (max--) {
>> -		/* Set the tx word if the transfer's original "tx"
>> is not null */
>> -		if (dws->tx_end - dws->len) {
>> +		/* Set the tx word if the transfer's "tx" is not
>> null */
>> +		if (dws->tx) {
>
> No, in current mainstream code, the dws->tx is changing, see code:
> 	dws->tx += dws->n_bytes;
> so we have to use if (dws->tx_end - dws->len) for now, maybe
> we can use some bit to indicate whether the original tx is null

If dws->tx is non-null then it points to a valid buffer, it is unconditionally 
set with dws->tx = (void *)transfer->tx_buf when the transfer is setup.  if the 
original transfer->tx_buf is non-null then this change works.

>
>>   			if (dws->n_bytes == 1)
>>   				txw = *(u8 *)(dws->tx);
>>   			else
>> @@ -213,7 +213,7 @@ static void spi_dw_reader(struct spi_dw *dws)
>>   	while (max--) {
>>   		rxw = dw_readw(dws, dr);
>>   		/* Care rx only if the transfer's original "rx" is
>> not null */
>> -		if (dws->rx_end - dws->len) {
>> +		if (dws->rx) {
>>   			if (dws->n_bytes == 1)
>>   				*(u8 *)(dws->rx) = rxw;
>>   			else

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