Re: [PATCH] ALSA: snd-usb-line6 depends on CONFIG_SND_HWDEP

[Takashi Sakamoto]

On Sep 21 2016 21:37, Takashi Iwai wrote:
> On Wed, 21 Sep 2016 03:56:05 +0200,
> Takashi Sakamoto wrote:
>>
>> On Sep 21 2016 07:14, Valdis Kletnieks wrote:
>>> ALSA - snd-usb-line6 depends on CONFIG_SND_HWDEP
>>>
>>> ERROR: "snd_hwdep_new" [sound/usb/line6/snd-usb-line6.ko] undefined!
>>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed
>>> make[1]: *** [__modpost] Error 1
>>>
>>> Signed-off-by: Valdis Kletnieks <valdis.kletnieks@xxxxxx>
>>
>> Reviewed-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
>>
>> As a nitpicking, I think it better to change the subject line with a
>> prefix of 'ALSA: line6:' or 'ALSA: usb-line6:', following to our
>> fashion.
> 
> Yes, I modified the subject line and added fixes tag.

Thanks.

As another issue, I can see sparse (v0.5.0) errors:

sound/usb/line6/driver.c:274:43: error: cannot size expression
sound/usb/line6/driver.c:275:16: error: cannot size expression
sound/usb/line6/driver.c:276:16: error: cannot size expression
sound/usb/line6/driver.c:277:16: error: cannot size expression

And this fix can suppresses them:

$ git diff sound/usb/line6
diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index f9224ec..ad7efc0 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -30,7 +30,7 @@
 /*
        This is Line 6's MIDI manufacturer ID.
 */
-const unsigned char line6_midi_id[] = {
+const unsigned char line6_midi_id[3] = {
        0x00, 0x01, 0x0c
 };
 EXPORT_SYMBOL_GPL(line6_midi_id);

Besides, there's a difference of the declaration between header and code:
$ cat sound/usb/line6/driver.h
...
extern const unsigned char line6_midi_id[3];

This is quite minor. So I can't judge to fix it or not... What do you
think about it?

>>> diff --git a/sound/usb/line6/Kconfig b/sound/usb/line6/Kconfig
>>> index 8ffcf48097d9..39b400392d71 100644
>>> --- a/sound/usb/line6/Kconfig
>>> +++ b/sound/usb/line6/Kconfig
>>> @@ -2,6 +2,7 @@ config SND_USB_LINE6
>>>  	tristate
>>>  	select SND_RAWMIDI
>>>  	select SND_PCM
>>> +	select SND_HWDEP
>>>
>>>  config SND_USB_POD
>>>  	tristate "Line 6 POD USB support"

Regards

Takashi Sakamoto