linux-kernel - Re: [PATCHv2] usb: typec: tps6598x: handle block writes separately with plain-I2C adapters

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Date:   Thu, 21 Feb 2019 18:40:54 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nikolaus Voss <nv@...n.de>
Cc:     kbuild-all@...org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, nikolaus.voss@...wensteinmedical.de
Subject: Re: [PATCHv2] usb: typec: tps6598x: handle block writes separately
 with plain-I2C adapters

Hi Nikolaus,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on v5.0-rc4 next-20190220]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Nikolaus-Voss/usb-typec-tps6598x-handle-block-writes-separately-with-plain-I2C-adapters/20190221-165456
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: i386-randconfig-a0-201907 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/usb/typec/tps6598x.c: In function 'tps6598x_block_write':
>> drivers/usb/typec/tps6598x.c:132:2: warning: variable length array 'data' is used [-Wvla]
     u8 data[len + 1];
     ^

vim +/data +132 drivers/usb/typec/tps6598x.c

   128	
   129	static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
   130					void *val, size_t len)
   131	{
 > 132		u8 data[len + 1];
   133	
   134		if (!tps->i2c_protocol)
   135			return regmap_raw_write(tps->regmap, reg, val, len);
   136	
   137		data[0] = len;
   138		memcpy(&data[1], val, len);
   139	
   140		return regmap_raw_write(tps->regmap, reg, data, sizeof(data));
   141	}
   142	

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