linux-kernel - [PATCH 08/21] spi: s3c64xx: move error check up to avoid rechecking

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Message-ID: <20240123153421.715951-9-tudor.ambarus@linaro.org>
Date: Tue, 23 Jan 2024 15:34:07 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: broonie@...nel.org,
	andi.shyti@...nel.org,
	arnd@...db.de
Cc: robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com,
	linux-spi@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	andre.draszik@...aro.org,
	peter.griffin@...aro.org,
	semen.protsenko@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH 08/21] spi: s3c64xx: move error check up to avoid rechecking

Check the return value of wait_for_completion_timeout() immediately
after the call so that we avoid checking the return value twice.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/spi/spi-s3c64xx.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 16eea56892a2..128c3b8211ce 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -519,17 +519,17 @@ static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
 
 	val = msecs_to_jiffies(ms) + 10;
 	val = wait_for_completion_timeout(&sdd->xfer_completion, val);
-
+	if (!val)
+		return -EIO;
 	/*
-	 * If the previous xfer was completed within timeout, then
-	 * proceed further else return -EIO.
+	 * If the previous xfer was completed within timeout proceed further.
 	 * DmaTx returns after simply writing data in the FIFO,
 	 * w/o waiting for real transmission on the bus to finish.
 	 * DmaRx returns only after Dma read data from FIFO which
 	 * needs bus transmission to finish, so we don't worry if
 	 * Xfer involved Rx(with or without Tx).
 	 */
-	if (val && !xfer->rx_buf) {
+	if (!xfer->rx_buf) {
 		val = msecs_to_loops(10);
 		status = readl(regs + S3C64XX_SPI_STATUS);
 		while ((TX_FIFO_LVL(status, sdd)
@@ -538,13 +538,8 @@ static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
 			cpu_relax();
 			status = readl(regs + S3C64XX_SPI_STATUS);
 		}
-
 	}
 
-	/* If timed out while checking rx/tx status return error */
-	if (!val)
-		return -EIO;
-
 	return 0;
 }
 
-- 
2.43.0.429.g432eaa2c6b-goog