linux-kernel - [PATCH v2] staging: wimax/i2400m: fix some byte order issues found by sparse

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Date:   Fri, 12 Feb 2021 21:08:43 +0530
From:   Anirudh Rayabharam <mail@...rudhrb.com>
To:     gregkh@...uxfoundation.org, lee.jones@...aro.org, arnd@...db.de,
        colin.king@...onical.com
Cc:     Anirudh Rayabharam <mail@...rudhrb.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] staging: wimax/i2400m: fix some byte order issues found by sparse

Fix sparse byte-order warnings in the i2400m_bm_cmd_prepare()
function:

wimax/i2400m/fw.c:194:36: warning: restricted __le32 degrades to integer
wimax/i2400m/fw.c:195:34: warning: invalid assignment: +=
wimax/i2400m/fw.c:195:34:    left side has type unsigned int
wimax/i2400m/fw.c:195:34:    right side has type restricted __le32
wimax/i2400m/fw.c:196:32: warning: restricted __le32 degrades to integer
wimax/i2400m/fw.c:196:47: warning: restricted __le32 degrades to integer
wimax/i2400m/fw.c:196:66: warning: restricted __le32 degrades to integer

Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>
---
 drivers/staging/wimax/i2400m/fw.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/wimax/i2400m/fw.c b/drivers/staging/wimax/i2400m/fw.c
index b2fd4bd2c5f9..92ea5c101e76 100644
--- a/drivers/staging/wimax/i2400m/fw.c
+++ b/drivers/staging/wimax/i2400m/fw.c
@@ -189,12 +189,17 @@ void i2400m_bm_cmd_prepare(struct i2400m_bootrom_header *cmd)
 {
 	if (i2400m_brh_get_use_checksum(cmd)) {
 		int i;
-		u32 checksum = 0;
+		__le32 checksum = 0;
 		const u32 *checksum_ptr = (void *) cmd->payload;
-		for (i = 0; i < cmd->data_size / 4; i++)
-			checksum += cpu_to_le32(*checksum_ptr++);
-		checksum += cmd->command + cmd->target_addr + cmd->data_size;
-		cmd->block_checksum = cpu_to_le32(checksum);
+
+		for (i = 0; i < le32_to_cpu(cmd->data_size) / 4; i++)
+			le32_add_cpu(&checksum, *checksum_ptr++);
+
+		le32_add_cpu(&checksum, le32_to_cpu(cmd->command));
+		le32_add_cpu(&checksum, le32_to_cpu(cmd->target_addr));
+		le32_add_cpu(&checksum, le32_to_cpu(cmd->data_size));
+
+		cmd->block_checksum = checksum;
 	}
 }
 EXPORT_SYMBOL_GPL(i2400m_bm_cmd_prepare);
-- 
2.26.2