linux-kernel - [PATCH v4 19/40] fsi: aspeed: Only read result register for successful read

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Message-Id: <20240605212312.349188-20-eajames@linux.ibm.com>
Date: Wed,  5 Jun 2024 16:22:51 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: linux-fsi@...ts.ozlabs.org
Cc: eajames@...ux.ibm.com, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-spi@...r.kernel.org,
        broonie@...nel.org, andi.shyti@...nel.org, joel@....id.au,
        alistair@...ple.id.au, jk@...abs.org, andrew@...econstruct.com.au,
        linux-aspeed@...ts.ozlabs.org, ninad@...ux.ibm.com,
        lakshmiy@...ibm.com
Subject: [PATCH v4 19/40] fsi: aspeed: Only read result register for successful read

No reason to read the result in the error path, and remove the
null pointer check on the output, as it should never be null.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index f840c7c4a56b9..10ca23cf58c2e 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -181,8 +181,6 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 	writel(OPB0_XFER_ACK_EN, base + OPB_IRQ_STATUS);
 	status = readl(base + OPB0_STATUS);
 
-	result = readl(base + OPB0_FSI_DATA_R);
-
 	/* Return error when poll timed out */
 	if (ret) {
 		trace_fsi_master_aspeed_timeout(reg, status, true);
@@ -193,21 +191,20 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 	if (status & STATUS_ERR_ACK)
 		return -EIO;
 
-	if (out) {
-		switch (transfer_size) {
-		case XFER_BYTE:
-			*(u8 *)out = result;
-			break;
-		case XFER_HALFWORD:
-			*(u16 *)out = result;
-			break;
-		case XFER_FULLWORD:
-			*(u32 *)out = result;
-			break;
-		default:
-			return -EINVAL;
-		}
+	result = readl(base + OPB0_FSI_DATA_R);
 
+	switch (transfer_size) {
+	case XFER_BYTE:
+		*(u8 *)out = result;
+		break;
+	case XFER_HALFWORD:
+		*(u16 *)out = result;
+		break;
+	case XFER_FULLWORD:
+		*(u32 *)out = result;
+		break;
+	default:
+		return -EINVAL;
 	}
 
 	trace_fsi_master_aspeed_opb_xfer(addr, transfer_size + 1, result, true);
-- 
2.39.3