[PATCH v1] staging: fieldbus: Use %pM format specifier for MAC addresses

[PATCH v1] staging: fieldbus: Use %pM format specifier for MAC addresses

[Andy Shevchenko]

Convert to %pM instead of using custom code.

While here, replace one time use structure by buffer on stack.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/staging/fieldbus/anybuss/hms-profinet.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/fieldbus/anybuss/hms-profinet.c b/drivers/staging/fieldbus/anybuss/hms-profinet.c
index 31c43a0a5776..505480fb281d 100644
--- a/drivers/staging/fieldbus/anybuss/hms-profinet.c
+++ b/drivers/staging/fieldbus/anybuss/hms-profinet.c
@@ -26,10 +26,6 @@
  * exactly as advertised.
  */
 
-struct msg_mac_addr {
-	u8 addr[6];
-};
-
 struct profi_priv {
 	struct fieldbus_dev fbdev;
 	struct anybuss_client *client;
@@ -59,17 +55,13 @@ static int profi_id_get(struct fieldbus_dev *fbdev, char *buf,
 			size_t max_size)
 {
 	struct profi_priv *priv = container_of(fbdev, struct profi_priv, fbdev);
-	struct msg_mac_addr response;
+	u8 mac[ETH_ALEN];
 	int ret;
 
-	ret = anybuss_recv_msg(priv->client, 0x0010, &response,
-			       sizeof(response));
+	ret = anybuss_recv_msg(priv->client, 0x0010, &mac, sizeof(mac));
 	if (ret < 0)
 		return ret;
-	return snprintf(buf, max_size, "%02X:%02X:%02X:%02X:%02X:%02X\n",
-		response.addr[0], response.addr[1],
-		response.addr[2], response.addr[3],
-		response.addr[4], response.addr[5]);
+	return snprintf(buf, max_size, "%pM\n", mac);
 }
 
 static bool profi_enable_get(struct fieldbus_dev *fbdev)
-- 
2.27.0

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Re: [PATCH v1] staging: fieldbus: Use %pM format specifier for MAC addresses

[kernel test robot]

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Hi Andy,

I love your patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]

url:    https://github.com/0day-ci/linux/commits/Andy-Shevchenko/staging-fieldbus-Use-pM-format-specifier-for-MAC-addresses/20200730-232835
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git d8a0f85d394a0cc5dec2b290ebcf8ed3cfdc1a70
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

   drivers/staging/fieldbus/anybuss/hms-profinet.c: In function 'profi_id_get':
>> drivers/staging/fieldbus/anybuss/hms-profinet.c:58:9: error: 'ETH_ALEN' undeclared (first use in this function)
      58 |  u8 mac[ETH_ALEN];
         |         ^~~~~~~~
   drivers/staging/fieldbus/anybuss/hms-profinet.c:58:9: note: each undeclared identifier is reported only once for each function it appears in
   drivers/staging/fieldbus/anybuss/hms-profinet.c:58:5: warning: unused variable 'mac' [-Wunused-variable]
      58 |  u8 mac[ETH_ALEN];
         |     ^~~
>> drivers/staging/fieldbus/anybuss/hms-profinet.c:65:1: warning: control reaches end of non-void function [-Wreturn-type]
      65 | }
         | ^

vim +/ETH_ALEN +58 drivers/staging/fieldbus/anybuss/hms-profinet.c

    53	
    54	static int profi_id_get(struct fieldbus_dev *fbdev, char *buf,
    55				size_t max_size)
    56	{
    57		struct profi_priv *priv = container_of(fbdev, struct profi_priv, fbdev);
  > 58		u8 mac[ETH_ALEN];
    59		int ret;
    60	
    61		ret = anybuss_recv_msg(priv->client, 0x0010, &mac, sizeof(mac));
    62		if (ret < 0)
    63			return ret;
    64		return snprintf(buf, max_size, "%pM\n", mac);
  > 65	}
    66	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH v1] staging: fieldbus: Use %pM format specifier for MAC addresses

[Sven Van Asbroeck]

Hi Andy, thank you for the patch ! See below.

On Thu, Jul 30, 2020 at 11:27 AM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> -struct msg_mac_addr {
> -       u8 addr[6];
> -};

I would prefer to keep this structure. It's conceptually important,
because it describes the binary layout of a message going to a
peripheral.

Perhaps you can still print using %pM by doing:
printf("%pM\n", response.addr) ?

> @@ -59,17 +55,13 @@ static int profi_id_get(struct fieldbus_dev *fbdev, char *buf,
>                         size_t max_size)
>  {
>         struct profi_priv *priv = container_of(fbdev, struct profi_priv, fbdev);
> -       struct msg_mac_addr response;
> +       u8 mac[ETH_ALEN];
>         int ret;
>
> -       ret = anybuss_recv_msg(priv->client, 0x0010, &response,
> -                              sizeof(response));
> +       ret = anybuss_recv_msg(priv->client, 0x0010, &mac, sizeof(mac));

Should the address-of operator (&) be present in &mac ?
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