linux-kernel - [PATCH v3] HID: ft260: fix format type warning in ft260_word

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Date:   Mon, 10 May 2021 19:34:28 +0300
From:   Michael Zaidman <michael.zaidman@...il.com>
To:     lkp@...el.com
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, jikos@...nel.org, joe@...ches.com,
        dan.carpenter@...cle.com, linux-input@...r.kernel.org,
        Michael Zaidman <michael.zaidman@...il.com>
Subject: [PATCH v3] HID: ft260: fix format type warning in ft260_word_show()

Fixes: 6a82582d9fa4 ("HID: ft260: add usb hid to i2c host bridge driver")

Fix warning reported by static analysis when built with W=1 for arm64 by
clang version 13.0.0

>> drivers/hid/hid-ft260.c:794:44: warning: format specifies type 'short' but
   the argument has type 'int' [-Wformat]
           return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
                                             ~~~     ^~~~~~~~~~~~~~~~~~~
                                             %i
   include/linux/byteorder/generic.h:91:21: note: expanded from
                                            macro 'le16_to_cpu'
   #define le16_to_cpu __le16_to_cpu
                       ^
   include/uapi/linux/byteorder/big_endian.h:36:26: note: expanded from
                                                    macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16'
           (__builtin_constant_p((__u16)(x)) ?     \
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Any sprintf style use of %h or %hi for a sub-int sized value isn't useful
since integer promotion is done on the value anyway. So, use %d instead.

https://lore.kernel.org/lkml/CAHk-=wgoxnmsj8GEVFJSvTwdnWm8wVJthefNk2n6+4TC=20e0Q@mail.gmail.com/

Signed-off-by: Michael Zaidman <michael.zaidman@...il.com>
Suggested-by: Joe Perches <joe@...ches.com>
Reported-by: kernel test robot <lkp@...el.com>
---
 drivers/hid/hid-ft260.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
index 047aa85a7c83..ff2a49b5cac5 100644
--- a/drivers/hid/hid-ft260.c
+++ b/drivers/hid/hid-ft260.c
@@ -779,7 +779,7 @@ static int ft260_byte_show(struct hid_device *hdev, int id, u8 *cfg, int len,
 	if (ret != len && ret >= 0)
 		return -EIO;
 
-	return scnprintf(buf, PAGE_SIZE, "%hi\n", *field);
+	return scnprintf(buf, PAGE_SIZE, "%d\n", *field);
 }
 
 static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len,
@@ -791,7 +791,7 @@ static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len,
 	if (ret != len && ret >= 0)
 		return -EIO;
 
-	return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
+	return scnprintf(buf, PAGE_SIZE, "%d\n", le16_to_cpu(*field));
 }
 
 #define FT260_ATTR_SHOW(name, reptype, id, type, func)			       \
-- 
2.25.1