linux-kernel - [PATCH V3 5/6] nvmem: u-boot-env: improve coding style

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Date: Thu, 21 Dec 2023 18:34:20 +0100
From: Rafał Miłecki <zajec5@...il.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Walle <michael@...le.cc>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	linux-mtd@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	u-boot@...ts.denx.de,
	Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V3 5/6] nvmem: u-boot-env: improve coding style

From: Rafał Miłecki <rafal@...ecki.pl>

1. Prefer kzalloc() over kcalloc()
   See memory-allocation.rst which says: "to be on the safe side it's
   best to use routines that set memory to zero, like kzalloc()"
2. Drop dev_err() for u_boot_env_add_cells() fail
   It can fail only on -ENOMEM. We don't want to print error then.
3. Add extra "crc32_addr" variable
   It makes code reading header's crc32 easier to understand / review.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
V2: New patch with suggestions from Miquel

 drivers/nvmem/u-boot-env.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvmem/u-boot-env.c b/drivers/nvmem/u-boot-env.c
index 111905189341..befbab156cda 100644
--- a/drivers/nvmem/u-boot-env.c
+++ b/drivers/nvmem/u-boot-env.c
@@ -132,6 +132,7 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 	size_t crc32_data_offset;
 	size_t crc32_data_len;
 	size_t crc32_offset;
+	__le32 *crc32_addr;
 	size_t data_offset;
 	size_t data_len;
 	size_t dev_size;
@@ -143,7 +144,7 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 
 	dev_size = nvmem_dev_size(nvmem);
 
-	buf = kcalloc(1, dev_size, GFP_KERNEL);
+	buf = kzalloc(dev_size, GFP_KERNEL);
 	if (!buf) {
 		err = -ENOMEM;
 		goto err_out;
@@ -175,7 +176,8 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 		data_offset = offsetof(struct u_boot_env_image_broadcom, data);
 		break;
 	}
-	crc32 = le32_to_cpu(*(__le32 *)(buf + crc32_offset));
+	crc32_addr = (__le32 *)(buf + crc32_offset);
+	crc32 = le32_to_cpu(*crc32_addr);
 	crc32_data_len = dev_size - crc32_data_offset;
 	data_len = dev_size - data_offset;
 
@@ -188,8 +190,6 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 
 	buf[dev_size - 1] = '\0';
 	err = u_boot_env_add_cells(priv, buf, data_offset, data_len);
-	if (err)
-		dev_err(dev, "Failed to add cells: %d\n", err);
 
 err_kfree:
 	kfree(buf);
-- 
2.35.3