linux-kernel - [PATCH] spi: spi-mem: Compute length only when needed

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Date:   Fri, 28 Feb 2020 16:07:44 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <broonie@...nel.org>, <linux-spi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Tudor.Ambarus@...rochip.com>
Subject: [PATCH] spi: spi-mem: Compute length only when needed

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

When adjust_op_size is defined, len is never used. Move the len
computation where it's actually used.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/spi/spi-mem.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 3c46747bacb1..adaa0c49f966 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -418,12 +418,13 @@ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
 	struct spi_controller *ctlr = mem->spi->controller;
 	size_t len;
 
-	len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
-
 	if (ctlr->mem_ops && ctlr->mem_ops->adjust_op_size)
 		return ctlr->mem_ops->adjust_op_size(mem, op);
 
 	if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) {
+		len = sizeof(op->cmd.opcode) + op->addr.nbytes +
+		      op->dummy.nbytes;
+
 		if (len > spi_max_transfer_size(mem->spi))
 			return -EINVAL;
 
-- 
2.23.0