linux-kernel - sound/core/control_led.c:492:22: sparse: sparse: incorrect type in assignment (different base types)

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Date:   Sat, 20 Nov 2021 10:21:38 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jaroslav Kysela <perex@...ex.cz>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>
Subject: sound/core/control_led.c:492:22: sparse: sparse: incorrect type in
 assignment (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a90af8f15bdc9449ee2d24e1d73fa3f7e8633f81
commit: a135dfb5de1501327895729b4f513370d2555b4d ALSA: led control - add sysfs kcontrol LED marking layer
date:   8 months ago
config: sparc64-randconfig-s031-20211116 (attached as .config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a135dfb5de1501327895729b4f513370d2555b4d
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout a135dfb5de1501327895729b4f513370d2555b4d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=sparc64 

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


sparse warnings: (new ones prefixed by >>)
>> sound/core/control_led.c:492:22: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int @@     got restricted snd_ctl_elem_iface_t [usertype] @@
   sound/core/control_led.c:492:22: sparse:     expected unsigned int
   sound/core/control_led.c:492:22: sparse:     got restricted snd_ctl_elem_iface_t [usertype]
   sound/core/control_led.c:494:22: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned int @@     got restricted snd_ctl_elem_iface_t [usertype] @@
   sound/core/control_led.c:494:22: sparse:     expected unsigned int
   sound/core/control_led.c:494:22: sparse:     got restricted snd_ctl_elem_iface_t [usertype]
>> sound/core/control_led.c:523:49: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected unsigned int *val @@     got restricted snd_ctl_elem_iface_t * @@
   sound/core/control_led.c:523:49: sparse:     expected unsigned int *val
   sound/core/control_led.c:523:49: sparse:     got restricted snd_ctl_elem_iface_t *

vim +492 sound/core/control_led.c

   488	
   489	static char *parse_iface(char *s, unsigned int *val)
   490	{
   491		if (!strncasecmp(s, "card", 4))
 > 492			*val = SNDRV_CTL_ELEM_IFACE_CARD;
   493		else if (!strncasecmp(s, "mixer", 5))
   494			*val = SNDRV_CTL_ELEM_IFACE_MIXER;
   495		return find_eos(s);
   496	}
   497	
   498	/*
   499	 * These types of input strings are accepted:
   500	 *
   501	 *   unsigned integer - numid (equivaled to numid=UINT)
   502	 *   string - basic mixer name (equivalent to iface=MIXER,name=STR)
   503	 *   numid=UINT
   504	 *   [iface=MIXER,][device=UINT,][subdevice=UINT,]name=STR[,index=UINT]
   505	 */
   506	static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, size_t count,
   507				  bool attach)
   508	{
   509		char buf2[256], *s;
   510		size_t len = max(sizeof(s) - 1, count);
   511		struct snd_ctl_elem_id id;
   512		int err;
   513	
   514		strncpy(buf2, buf, len);
   515		buf2[len] = '\0';
   516		memset(&id, 0, sizeof(id));
   517		id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
   518		s = buf2;
   519		while (*s) {
   520			if (!strncasecmp(s, "numid=", 6)) {
   521				s = parse_uint(s + 6, &id.numid);
   522			} else if (!strncasecmp(s, "iface=", 6)) {
 > 523				s = parse_iface(s + 6, &id.iface);
   524			} else if (!strncasecmp(s, "device=", 7)) {
   525				s = parse_uint(s + 7, &id.device);
   526			} else if (!strncasecmp(s, "subdevice=", 10)) {
   527				s = parse_uint(s + 10, &id.subdevice);
   528			} else if (!strncasecmp(s, "name=", 5)) {
   529				s = parse_string(s + 5, id.name, sizeof(id.name));
   530			} else if (!strncasecmp(s, "index=", 6)) {
   531				s = parse_uint(s + 6, &id.index);
   532			} else if (s == buf2) {
   533				while (*s) {
   534					if (*s < '0' || *s > '9')
   535						break;
   536					s++;
   537				}
   538				if (*s == '\0')
   539					parse_uint(buf2, &id.numid);
   540				else {
   541					for (; *s >= ' '; s++);
   542					*s = '\0';
   543					strlcpy(id.name, buf2, sizeof(id.name));
   544				}
   545				break;
   546			}
   547			if (*s == ',')
   548				s++;
   549		}
   550	
   551		err = snd_ctl_led_set_id(led_card->number, &id, led_card->led->group, attach);
   552		if (err < 0)
   553			return err;
   554	
   555		return count;
   556	}
   557	

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

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