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

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Date:	Fri, 25 Sep 2015 08:32:04 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Luis de Bethencourt <luisbg@....samsung.com>
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 Thu, 24 Sep 2015 21:08:39 +0200,
Luis de Bethencourt wrote:
> 
> 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.

In that case, I prefer leaving as is, sorry.  The code is using -1 for
its purpose, and the error number isn't important there in anyway
since the driver doesn't abort at all.


thanks,

Takashi

> 
> 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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