linux-kernel - [PATCH] wimax/i2400m: fix calculation of index, remove sizeof

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Message-Id: <20190823085230.6225-1-colin.king@canonical.com>
Date:   Fri, 23 Aug 2019 09:52:30 +0100
From:   Colin King <colin.king@...onical.com>
To:     Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
        linux-wimax@...el.com, "David S . Miller" <davem@...emloft.net>,
        netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] wimax/i2400m: fix calculation of index, remove sizeof

From: Colin Ian King <colin.king@...onical.com>

The subtraction of the two pointers is automatically scaled by the
size of the size of the object the pointers point to, so the division
by sizeof(*i2400m->barker) is incorrect.  Fix this by removing the
division.  Also make index an unsigned int to clean up a checkpatch
warning.

Addresses-Coverity: ("Extra sizeof expression")
Fixes: aba3792ac2d7 ("wimax/i2400m: rework bootrom initialization to be more flexible")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/wimax/i2400m/fw.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wimax/i2400m/fw.c b/drivers/net/wimax/i2400m/fw.c
index 489cba9b284d..599a703af6eb 100644
--- a/drivers/net/wimax/i2400m/fw.c
+++ b/drivers/net/wimax/i2400m/fw.c
@@ -399,8 +399,7 @@ int i2400m_is_boot_barker(struct i2400m *i2400m,
 	 * associated with the device. */
 	if (i2400m->barker
 	    && !memcmp(buf, i2400m->barker, sizeof(i2400m->barker->data))) {
-		unsigned index = (i2400m->barker - i2400m_barker_db)
-			/ sizeof(*i2400m->barker);
+		unsigned int index = i2400m->barker - i2400m_barker_db;
 		d_printf(2, dev, "boot barker cache-confirmed #%u/%08x\n",
 			 index, le32_to_cpu(i2400m->barker->data[0]));
 		return 0;
-- 
2.20.1