linux-kernel - Re: [PATCH] staging:rts

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Date:	Mon, 10 Oct 2011 09:51:03 +0800
From:	wwang <wei_wang@...lsil.com.cn>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging:rts_pstor:Fix SDIO issue

Dear Carpenter:

I will resend the patch

Best Regards,
wwang


于 2011年10月09日 21:57, Dan Carpenter 写道:
> What I'm saying is, it's confusing to add another variable which is
> only subtly different from retval.  Here is what it looks like after
> we apply the patch.
>
> 	int reset_pass = 0;
>
> 	/* skip 45 lines */
>
> 	retval = sd_change_bank_voltage(chip, SD_IO_3V3);
> 	if (retval != STATUS_SUCCESS) {
> 		TRACE_RET(chip, STATUS_FAIL);
> 	}
>
> 	/* skip 30 lines */
>
> 	if (!reset_pass)
> 		TRACE_RET(chip, STATUS_FAIL);
>
> The reviewer would have to read through 80 lines of code to find that
> we don't care about the return value from sd_change_bank_voltage().
> Don't do it that way.
>
> Here is how I would write what it.  I can't actually test this since
> I don't have the hardware...
>
> diff --git a/drivers/staging/rts_pstor/sd.c b/drivers/staging/rts_pstor/sd.c
> index fb62eaf..46bf0e1 100644
> --- a/drivers/staging/rts_pstor/sd.c
> +++ b/drivers/staging/rts_pstor/sd.c
> @@ -3134,39 +3134,36 @@ int reset_sd_card(struct rtsx_chip *chip)
>  
>  	if (chip->sd_ctl & RESET_MMC_FIRST) {
>  		retval = reset_mmc(chip);
> -		if ((retval != STATUS_SUCCESS) && !sd_check_err_code(chip, SD_NO_CARD)) {
> +		if (retval != STATUS_SUCCESS) {
> +			if (sd_check_err_code(chip, SD_NO_CARD))
> +				TRACE_RET(chip, STATUS_FAIL);
> +
>  			retval = reset_sd(chip);
>  			if (retval != STATUS_SUCCESS) {
> -				if (CHECK_PID(chip, 0x5209)) {
> -					retval = sd_change_bank_voltage(chip, SD_IO_3V3);
> -					if (retval != STATUS_SUCCESS) {
> -						TRACE_RET(chip, STATUS_FAIL);
> -					}
> -				}
> +				if (CHECK_PID(chip, 0x5209))
> +					sd_change_bank_voltage(chip, SD_IO_3V3);
> +				TRACE_RET(chip, STATUS_FAIL);
>  			}
>  		}
>  	} else {
>  		retval = reset_sd(chip);
>  		if (retval != STATUS_SUCCESS) {
> -			if (sd_check_err_code(chip, SD_NO_CARD)) {
> +			if (sd_check_err_code(chip, SD_NO_CARD))
>  				TRACE_RET(chip, STATUS_FAIL);
> -			}
>  
>  			if (CHECK_PID(chip, 0x5209)) {
>  				retval = sd_change_bank_voltage(chip, SD_IO_3V3);
> -				if (retval != STATUS_SUCCESS) {
> +				if (retval != STATUS_SUCCESS)
>  					TRACE_RET(chip, STATUS_FAIL);
> -				}
>  			}
>  
> -			if (!chip->sd_io) {
> -				retval = reset_mmc(chip);
> -			}
> -		}
> -	}
> +			if (chip->sd_io)
> +				TRACE_RET(chip, STATUS_FAIL);
>  
> -	if (retval != STATUS_SUCCESS) {
> -		TRACE_RET(chip, STATUS_FAIL);
> +			retval = reset_mmc(chip);
> +			if (retval != STATUS_SUCCESS)
> +				TRACE_RET(chip, STATUS_FAIL);
> +		}
>  	}
>  
>  	retval = sd_set_clock_divider(chip, SD_CLK_DIVIDE_0);

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