Hi Jorge,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on sound/for-next]
[also build test ERROR on v4.18-rc5 next-20180719]
[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/Jorge-Sanjuan/usb-audio-Add-UAC3-Power-Domains/20180719-212009
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        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
        GCC_VERSION=7.2.0 make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   sound//usb/power.c: In function 'snd_usb_find_power_domain':
   sound//usb/power.c:36:7: error: implicit declaration of function 'kzalloc'; did you mean 'd_alloc'? [-Werror=implicit-function-declaration]
     pd = kzalloc(sizeof(*pd), GFP_KERNEL);
          ^~~~~~~
          d_alloc
   sound//usb/power.c:36:5: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     pd = kzalloc(sizeof(*pd), GFP_KERNEL);
        ^
>> sound//usb/power.c:59:2: error: implicit declaration of function 'kfree'; did you mean 'irq_free'? [-Werror=implicit-function-declaration]
     kfree(pd);
     ^~~~~
     irq_free
   cc1: some warnings being treated as errors

vim +59 sound//usb/power.c

    28	
    29	struct snd_usb_power_domain *
    30	snd_usb_find_power_domain(struct usb_host_interface *ctrl_iface,
    31				  unsigned char id)
    32	{
    33		struct snd_usb_power_domain *pd;
    34		void *p;
    35	
  > 36		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
    37		if (!pd)
    38			return NULL;
    39	
    40		p = NULL;
    41		while ((p = snd_usb_find_csint_desc(ctrl_iface->extra,
    42						    ctrl_iface->extralen,
    43						    p, UAC3_POWER_DOMAIN)) != NULL) {
    44			struct uac3_power_domain_descriptor *pd_desc = p;
    45			int i;
    46	
    47			for (i = 0; i < pd_desc->bNrEntities; i++) {
    48				if (pd_desc->baEntityID[i] == id) {
    49					pd->pd_id = pd_desc->bPowerDomainID;
    50					pd->pd_d1d0_rec =
    51						le16_to_cpu(pd_desc->waRecoveryTime1);
    52					pd->pd_d2d0_rec =
    53						le16_to_cpu(pd_desc->waRecoveryTime2);
    54					return pd;
    55				}
    56			}
    57		}
    58	
  > 59		kfree(pd);
    60		return NULL;
    61	}
    62	

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