Re: [PATCH] staging:rts_pstor:Fix SDIO issue

[Dan Carpenter <dan.carpenter@oracle.com>]

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);