linux-kernel - Re: [PATCH v2 2/3] Input: Add Novatek NT36xxx touchscreen driver

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Date:   Tue, 6 Oct 2020 21:34:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...ts.01.org, kholk11@...il.com, dmitry.torokhov@...il.com
Cc:     lkp@...el.com, kbuild-all@...ts.01.org, robh+dt@...nel.org,
        rydberg@...math.org, priv.luk@...il.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        kholk11@...il.com, marijns95@...il.com, konradybcio@...il.com,
        martin.botka1@...il.com
Subject: Re: [PATCH v2 2/3] Input: Add Novatek NT36xxx touchscreen driver

Hi,

Thank you for the patch! Perhaps something to improve:

url:    https://github.com/0day-ci/linux/commits/kholk11-gmail-com/Add-Novatek-NT36xxx-touchscreen-driver/20200927-203756
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: i386-randconfig-m021-20201003 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>

smatch warnings:
drivers/input/touchscreen/nt36xxx.c:470 nt36xxx_i2c_chip_version_init() warn: calling memset(x, y, ARRAY_SIZE());

vim +470 drivers/input/touchscreen/nt36xxx.c

6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  443  static int nt36xxx_i2c_chip_version_init(struct nt36xxx_i2c *ts)
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  444  {
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  445  	u8 buf[7] = { 0 };
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  446  	int retry = NT36XXX_MAX_RETRIES;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  447  	int sz = sizeof(trim_id_table) / sizeof(struct nt36xxx_trim_table);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  448  	int i, list, mapid, ret;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  449  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  450  	ret = nt36xxx_bootloader_reset(ts);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  451  	if (ret < 0) {
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  452  		dev_err(&ts->client->dev, "Can't reset the nvt IC\n");
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  453  		return ret;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  454  	}
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  455  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  456  	do {
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  457  		ret = nt36xxx_sw_reset_idle(ts);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  458  		if (ret < 0)
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  459  			continue;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  460  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  461  		buf[0] = 0x00;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  462  		buf[1] = NT36XXX_CMD_UNLOCK;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  463  		nt36xxx_write(ts->client, ts->client->addr, buf, 2);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  464  		usleep_range(10000, 11000);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  465  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  466  		ret = nt36xxx_set_page(ts, NT36XXX_PAGE_CHIP_INFO);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  467  		if (ret < 0)
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  468  			continue;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  469  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27 @470  		memset(buf, 0, ARRAY_SIZE(buf));

memset() should always zero the number of bytes (sizeof(buf)), not the
number of elements (ARRAY_SIZE(buf)).  For u8, of course, the elements
are byte size so it's the same.  But if someone uses
`grep -w memset $(git ls-files) | grep ARRAY_SIZE` then this will show
up as improper code.

6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  471  		buf[0] = NT36XXX_EVT_CHIPID;
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  472  		nt36xxx_read(ts->client, NT36XXX_BLDR_ADDR, buf, 7);
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  473  
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  474  		/* Compare read chip id with trim list */
6375d650f6f53aa AngeloGioacchino Del Regno 2020-09-27  475  		for (list = 0; list < sz; list++) {

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

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