linux-kernel - Re: [PATCH v2] sound: oss: ad1848: Fix returned errno code in ad1848

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Date:	Thu, 24 Sep 2015 20:08:39 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	sudipm.mukherjee@...il.com, joe@...ches.com, perex@...ex.cz,
	elfring@...rs.sourceforge.net
Subject: Re: [PATCH v2] sound: oss: ad1848: Fix returned errno code in ad1848_init()

On 24/09/15 19:56, Takashi Iwai wrote:
> On Thu, 24 Sep 2015 19:58:30 +0200,
> Luis de Bethencourt wrote:
>>
>> The driver is using -1 instead of the -ENOMEM defined macro to specify
>> that a buffer allocation failed. Since the error number is propagated,
>> the caller will get a -EPERM which is the wrong error condition.
> 
> Where is the propagated error number referred?  In other words, do we
> have a clear merit of changing this old stuff with rather a risk of
> regression?
> 
> 
> thanks,
> 
> Takashi

Hi Takashi,

The propagated error number is not referred. The only merit here is to
use the appropriate error number and silence the smatch tool.

Thanks for the review,
Luis

> 
>> Changed the checks of the return of ad1848_init() to be for >= 0,
>> instead of != -1.
>>
>> Smatch tool warning:
>> ad1848_init() warn: returning -1 instead of -ENOMEM is sloppy
>>
>> Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>
>> ---
>>  sound/oss/ad1848.c    | 4 ++--
>>  sound/oss/dev_table.c | 2 +-
>>  sound/oss/pss.c       | 2 +-
>>  3 files changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/sound/oss/ad1848.c b/sound/oss/ad1848.c
>> index 10c8de1..58c6d31 100644
>> --- a/sound/oss/ad1848.c
>> +++ b/sound/oss/ad1848.c
>> @@ -1992,7 +1992,7 @@ int ad1848_init (char *name, struct resource *ports, int irq, int dma_playback,
>>  	portc = kmalloc(sizeof(ad1848_port_info), GFP_KERNEL);
>>  	if(portc==NULL) {
>>  		release_region(devc->base, 4);
>> -		return -1;
>> +		return -ENOMEM;
>>  	}
>>  
>>  	if ((my_dev = sound_install_audiodrv(AUDIO_DRIVER_VERSION,
>> @@ -2007,7 +2007,7 @@ int ad1848_init (char *name, struct resource *ports, int irq, int dma_playback,
>>  	{
>>  		release_region(devc->base, 4);
>>  		kfree(portc);
>> -		return -1;
>> +		return my_dev;
>>  	}
>>  	
>>  	audio_devs[my_dev]->portc = portc;
>> diff --git a/sound/oss/dev_table.c b/sound/oss/dev_table.c
>> index 6dad515..abb3db4 100644
>> --- a/sound/oss/dev_table.c
>> +++ b/sound/oss/dev_table.c
>> @@ -148,7 +148,7 @@ EXPORT_SYMBOL(sound_install_mixer);
>>  
>>  void sound_unload_audiodev(int dev)
>>  {
>> -	if (dev != -1) {
>> +	if (dev >= 0) {
>>  		DMAbuf_deinit(dev);
>>  		audio_devs[dev] = NULL;
>>  		unregister_sound_dsp((dev<<4)+3);
>> diff --git a/sound/oss/pss.c b/sound/oss/pss.c
>> index 81314f9..e84aafe 100644
>> --- a/sound/oss/pss.c
>> +++ b/sound/oss/pss.c
>> @@ -1091,7 +1091,7 @@ static int __init probe_pss_mss(struct address_info *hw_config)
>>  	pss_mixer_reset(devc);
>>  	attach_ms_sound(hw_config, ports, THIS_MODULE);	/* Slot 0 */
>>  
>> -	if (hw_config->slots[0] != -1)
>> +	if (hw_config->slots[0] >= 0)
>>  	{
>>  		/* The MSS driver installed itself */
>>  		audio_devs[hw_config->slots[0]]->coproc = &pss_coproc_operations;
>> -- 
>> 2.5.1
>>
>>

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