On Jul 13 2016 19:18, Takashi Sakamoto wrote:
> Hi,
>
> On Jul 13 2016 18:59, Dan Carpenter wrote:
>> My static checker complains that "resp" could be unitialized on error
>> when we print its value.
>>
>> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>>
>> diff --git a/sound/pci/mixart/mixart_mixer.c
>> b/sound/pci/mixart/mixart_mixer.c
>> index 58fd79eb..51e5349 100644
>> --- a/sound/pci/mixart/mixart_mixer.c
>> +++ b/sound/pci/mixart/mixart_mixer.c
>> @@ -965,7 +965,7 @@ static int mixart_update_monitoring(struct
>> snd_mixart* chip, int channel)
>> int err;
>> struct mixart_msg request;
>> struct mixart_set_out_audio_level audio_level;
>> - u32 resp;
>> + u32 resp = 0;
>>
>> if(chip->pipe_out_ana.status == PIPE_UNDEFINED)
>> return -EINVAL; /* no pipe defined */
>
> The 'resp' variable is firstly given to snd_mixart_send_msg().
>
> static int mixart_update_monitoring(struct snd_mixart* chip,
> int channel)
> {
> ...
> err = snd_mixart_send_msg(chip->mgr, &request, sizeof(resp), &resp);
> if((err<0) || resp) {
> dev_dbg(chip->card->dev,
> "error MSG_CONNECTOR_SET_OUT_AUDIO_LEVEL card(%d)
> resp(%x)\n",
> chip->chip_idx, resp);
> return -EINVAL;
> }
> return 0;
> }
>
> When the function, snd_mixart_send_msg(), assigns nothing to the
> variable in error cases, dev_dbg() prints uninitialized value.
Hm. I realized that this interpretation is not enough. When value of the
error is not negative, snd_mixart_send_msg() can assign something to the
resp variable, then dev_dbg() is called. In short, when the function is
successful, there's a case that the message is processed. This is a bit
strange...
I think a condition statement for the resp variable is needless here, as
long as the variable is initialized ahead...
> Reviewed-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
Anyway, it's better to initialize it.
Regards
Takashi Sakamoto
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