linux-kernel - Re: [greybus-dev] [PATCH 1/3] [PATCH] staging: greybus: fix warnings about endianness detected by sparse

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Date:   Fri, 25 Sep 2020 22:09:30 +0800
From:   Coiby Xu <coiby.xu@...il.com>
To:     Alex Elder <elder@...aro.org>
Cc:     devel@...verdev.osuosl.org, Alex Elder <elder@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>,
        "moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [greybus-dev] [PATCH 1/3] [PATCH] staging: greybus: fix warnings
 about endianness detected by sparse

On Thu, Sep 24, 2020 at 07:50:57AM -0500, Alex Elder wrote:
>On 9/24/20 5:20 AM, Coiby Xu wrote:
>> This patch fix the following warnings from sparse,
>
>You need to address Greg's comment.
>
>But in general this looks good.  I have one comment below, which
>you can address in v2.  If you (or others) disagree with it, I'm
>fine with your code as-is.  Either way, you can add this:
>
>Reviewed-by: Alex Elder <elder@...aro.org>

Thank you fore reviewing this patch!

>
>> $ make C=2 drivers/staging/greybus/
>> drivers/staging/greybus/audio_module.c:222:25: warning: incorrect type in assignment (different base types)
>> drivers/staging/greybus/audio_module.c:222:25:    expected restricted __le16 [usertype] data_cport
>> drivers/staging/greybus/audio_module.c:222:25:    got unsigned short [usertype] intf_cport_id
>> drivers/staging/greybus/audio_topology.c:460:40: warning: restricted __le32 degrades to integer
>> drivers/staging/greybus/audio_topology.c:691:41: warning: incorrect type in assignment (different base types)
>
>. . .
>
>> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
>> index 83b38ae8908c..56bf1a4f95ad 100644
>> --- a/drivers/staging/greybus/audio_topology.c
>> +++ b/drivers/staging/greybus/audio_topology.c
>> @@ -466,7 +466,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
>>  		goto exit;
>>
>>  	/* update ucontrol */
>> -	if (gbvalue.value.integer_value[0] != val) {
>> +	if (gbvalue.value.integer_value[0] != cpu_to_le32(val)) {
>
>It's equivalent, but I have a small preference to convert
>the value from gbvalue into CPU byte order rather than
>what you have here.

Thank you for the suggestion! I'll use CPU byte order when submitting
next version.
>
>>  		for (wi = 0; wi < wlist->num_widgets; wi++) {
>>  			widget = wlist->widgets[wi];
>>  			snd_soc_dapm_mixer_update_power(widget->dapm, kcontrol,
>> @@ -689,7 +689,7 @@ static int gbaudio_tplg_create_kcontrol(struct gbaudio_module_info *gb,
>>  				return -ENOMEM;
>>  			ctldata->ctl_id = ctl->id;
>>  			ctldata->data_cport = le16_to_cpu(ctl->data_cport);
>> -			ctldata->access = ctl->access;
>> +			ctldata->access = le32_to_cpu(ctl->access);
>>  			ctldata->vcount = ctl->count_values;
>>  			ctldata->info = &ctl->info;
>>  			*kctl = (struct snd_kcontrol_new)
>> @@ -744,10 +744,10 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol,
>>  		return ret;
>>  	}
>>
>> -	ucontrol->value.enumerated.item[0] = gbvalue.value.enumerated_item[0];
>> +	ucontrol->value.enumerated.item[0] = le32_to_cpu(gbvalue.value.enumerated_item[0]);
>>  	if (e->shift_l != e->shift_r)
>>  		ucontrol->value.enumerated.item[1] =
>> -			gbvalue.value.enumerated_item[1];
>> +			le32_to_cpu(gbvalue.value.enumerated_item[1]);
>>
>>  	return 0;
>>  }
>> @@ -801,10 +801,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
>>  	mask = e->mask << e->shift_l;
>>
>>  	if (gbvalue.value.enumerated_item[0] !=
>> -	    ucontrol->value.enumerated.item[0]) {
>> +	    cpu_to_le32(ucontrol->value.enumerated.item[0])) {
>>  		change = 1;
>>  		gbvalue.value.enumerated_item[0] =
>> -			ucontrol->value.enumerated.item[0];
>> +			cpu_to_le32(ucontrol->value.enumerated.item[0]);
>>  	}
>>
>>  	if (e->shift_l != e->shift_r) {
>> @@ -813,10 +813,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
>>  		val |= ucontrol->value.enumerated.item[1] << e->shift_r;
>>  		mask |= e->mask << e->shift_r;
>>  		if (gbvalue.value.enumerated_item[1] !=
>> -		    ucontrol->value.enumerated.item[1]) {
>> +		    cpu_to_le32(ucontrol->value.enumerated.item[1])) {
>>  			change = 1;
>>  			gbvalue.value.enumerated_item[1] =
>> -				ucontrol->value.enumerated.item[1];
>> +				cpu_to_le32(ucontrol->value.enumerated.item[1]);
>>  		}
>>  	}
>>
>> @@ -887,7 +887,7 @@ static int gbaudio_tplg_create_mixer_ctl(struct gbaudio_module_info *gb,
>>  		return -ENOMEM;
>>  	ctldata->ctl_id = ctl->id;
>>  	ctldata->data_cport = le16_to_cpu(ctl->data_cport);
>> -	ctldata->access = ctl->access;
>> +	ctldata->access = le32_to_cpu(ctl->access);
>>  	ctldata->vcount = ctl->count_values;
>>  	ctldata->info = &ctl->info;
>>  	*kctl = (struct snd_kcontrol_new)
>>
>

--
Best regards,
Coiby