linux-kernel - [PATCH v1 1/1] spi: Remove unneded check for orig

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Date: Tue,  7 May 2024 23:10:27 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Mark Brown <broonie@...nel.org>,
	linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] spi: Remove unneded check for orig_nents

Both dma_unmap_sgtable() and sg_free_table() in spi_unmap_buf_attrs()
have checks for orig_nents against 0. No need to duplicate this.
All the same applies to other DMA mapping API calls.

Also note, there is no other user in the kernel that does this kind of
checks.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/spi/spi.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b7e40898590a..cb27d9e551a4 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1221,12 +1221,10 @@ static void spi_unmap_buf_attrs(struct spi_controller *ctlr,
 				enum dma_data_direction dir,
 				unsigned long attrs)
 {
-	if (sgt->orig_nents) {
-		dma_unmap_sgtable(dev, sgt, dir, attrs);
-		sg_free_table(sgt);
-		sgt->orig_nents = 0;
-		sgt->nents = 0;
-	}
+	dma_unmap_sgtable(dev, sgt, dir, attrs);
+	sg_free_table(sgt);
+	sgt->orig_nents = 0;
+	sgt->nents = 0;
 }
 
 void spi_unmap_buf(struct spi_controller *ctlr, struct device *dev,
@@ -1331,10 +1329,8 @@ static void spi_dma_sync_for_device(struct spi_controller *ctlr,
 	if (!ctlr->cur_msg_mapped)
 		return;
 
-	if (xfer->tx_sg.orig_nents)
-		dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE);
-	if (xfer->rx_sg.orig_nents)
-		dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE);
+	dma_sync_sgtable_for_device(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE);
+	dma_sync_sgtable_for_device(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE);
 }
 
 static void spi_dma_sync_for_cpu(struct spi_controller *ctlr,
@@ -1346,10 +1342,8 @@ static void spi_dma_sync_for_cpu(struct spi_controller *ctlr,
 	if (!ctlr->cur_msg_mapped)
 		return;
 
-	if (xfer->rx_sg.orig_nents)
-		dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE);
-	if (xfer->tx_sg.orig_nents)
-		dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE);
+	dma_sync_sgtable_for_cpu(rx_dev, &xfer->rx_sg, DMA_FROM_DEVICE);
+	dma_sync_sgtable_for_cpu(tx_dev, &xfer->tx_sg, DMA_TO_DEVICE);
 }
 #else /* !CONFIG_HAS_DMA */
 static inline int __spi_map_msg(struct spi_controller *ctlr,
-- 
2.43.0.rc1.1336.g36b5255a03ac