On Aug 27 2016 06:34, kbuild test robot wrote:

Hi Takashi,

[auto build test WARNING on sound/for-next]
[also build test WARNING on v4.8-rc3 next-20160825]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Takashi-Sakamoto/ALSA-fireworks-accessing-to-user-space-outside-spinlock/20160827-045250
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
config: tile-allyesconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All warnings (new ones prefixed by >>):

   sound/firewire/fireworks/fireworks_hwdep.c: In function 'hwdep_read_locked':

quoted

quoted

sound/firewire/fireworks/fireworks_hwdep.c:86:8: warning: missing braces around initializer [-Wmissing-braces]

   sound/firewire/fireworks/fireworks_hwdep.c:86:8: warning: (near initialization for 'event.common') [-Wmissing-braces]

vim +86 sound/firewire/fireworks/fireworks_hwdep.c

    70				count += till_end;
    71				remained -= till_end;
    72			}
    73	
    74			efw->resp_queues--;
    75		}
    76	
    77		spin_unlock_irq(&efw->lock);
    78	
    79		return count;
    80	}
    81	
    82	static long
    83	hwdep_read_locked(struct snd_efw *efw, char __user *buf, long count,
    84			  loff_t *offset)
    85	{
  > 86		union snd_firewire_event event = {0};

Mm. I should have indicate actual data type of this union for desinated
initialization.
https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html

So as for firewire-tascam module. I'll post revised version of them.
Sorry for stable developers but please ignore this patchset...

    87	
    88		event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
    89	
    90		spin_lock_irq(&efw->lock);
    91	
    92		event.lock_status.status = (efw->dev_lock_count > 0);
    93		efw->dev_lock_changed = false;
    94	

Regards

Takashi Sakamoto