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SubjectRe: [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@osg.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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