spi: use simplified spi_sync() calling convention

Given the patch which simplifies the spi_sync calling convention, this one
updates the callers of that routine which tried using it according to the
previous specification.  (Most didn't.)

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/input/touchscreen/ads7846.c

@@ -267,13 +267,12 @@ static int ads7846_read12_ser(struct device *dev, unsigned command)
 	ts->irq_disabled = 0;
 	enable_irq(spi->irq);
 
-	if (req->msg.status)
-		status = req->msg.status;
-
-	/* on-wire is a must-ignore bit, a BE12 value, then padding */
-	sample = be16_to_cpu(req->sample);
-	sample = sample >> 3;
-	sample &= 0x0fff;
+	if (status == 0) {
+		/* on-wire is a must-ignore bit, a BE12 value, then padding */
+		sample = be16_to_cpu(req->sample);
+		sample = sample >> 3;
+		sample &= 0x0fff;
+	}
 
 	kfree(req);
 	return status ? status : sample;

drivers/mmc/host/mmc_spi.c

@@ -176,8 +176,6 @@ mmc_spi_readbytes(struct mmc_spi_host *host, unsigned len)
 				DMA_FROM_DEVICE);
 
 	status = spi_sync(host->spi, &host->readback);
-	if (status == 0)
-		status = host->readback.status;
 
 	if (host->dma_dev)
 		dma_sync_single_for_cpu(host->dma_dev,
@@ -480,8 +478,6 @@ mmc_spi_command_send(struct mmc_spi_host *host,
 				DMA_BIDIRECTIONAL);
 	}
 	status = spi_sync(host->spi, &host->m);
-	if (status == 0)
-		status = host->m.status;
 
 	if (host->dma_dev)
 		dma_sync_single_for_cpu(host->dma_dev,
@@ -624,8 +620,6 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
 				DMA_BIDIRECTIONAL);
 
 	status = spi_sync(spi, &host->m);
-	if (status == 0)
-		status = host->m.status;
 
 	if (status != 0) {
 		dev_dbg(&spi->dev, "write error (%d)\n", status);
@@ -726,8 +720,6 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t)
 		}
 
 		status = spi_sync(spi, &host->m);
-		if (status == 0)
-			status = host->m.status;
 
 		if (host->dma_dev) {
 			dma_sync_single_for_cpu(host->dma_dev,
@@ -905,8 +897,6 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
 					DMA_BIDIRECTIONAL);
 
 		tmp = spi_sync(spi, &host->m);
-		if (tmp == 0)
-			tmp = host->m.status;
 
 		if (host->dma_dev)
 			dma_sync_single_for_cpu(host->dma_dev,

drivers/rtc/rtc-max6902.c

@@ -89,13 +89,9 @@ static int max6902_get_reg(struct device *dev, unsigned char address,
 
 	/* do the i/o */
 	status = spi_sync(spi, &message);
-	if (status == 0)
-		status = message.status;
-	else
-		return status;
-
-	*data = chip->rx_buf[1];
 
+	if (status == 0)
+		*data = chip->rx_buf[1];
 	return status;
 }
 
@@ -125,9 +121,7 @@ static int max6902_get_datetime(struct device *dev, struct rtc_time *dt)
 
 	/* do the i/o */
 	status = spi_sync(spi, &message);
-	if (status == 0)
-		status = message.status;
-	else
+	if (status)
 		return status;
 
 	/* The chip sends data in this order: