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Subject[PATCH] SOUND: riptide.c proper handling of pci_register_driver for joystick
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On Wed, 2009-07-15 at 11:10 +0200, Takashi Iwai wrote:
> At Wed, 15 Jul 2009 11:57:30 +0530,
> Jaswinder Singh Rajput wrote:
> >
> > I am getting this compiler warning in linus tree :
> >
> > CC [M] sound/pci/riptide/riptide.o
> > sound/pci/riptide/riptide.c: In function ‘alsa_card_riptide_init’:
> > sound/pci/riptide/riptide.c:2200: warning: ignoring return value of ‘__pci_register_driver’, declared with attribute warn_unused_result
> >
> > This fixes the warning in my case, hope this will be helpful :
> >
> > diff --git a/sound/pci/riptide/riptide.c b/sound/pci/riptide/riptide.c
> > index 235a71e..fd8a552 100644
> > --- a/sound/pci/riptide/riptide.c
> > +++ b/sound/pci/riptide/riptide.c
> > @@ -2197,9 +2197,9 @@ static int __init alsa_card_riptide_init(void)
> > if (err < 0)
> > return err;
> > #if defined(SUPPORT_JOYSTICK)
> > - pci_register_driver(&joystick_driver);
> > + err = pci_register_driver(&joystick_driver);
> > #endif
> > - return 0;
> > + return err;
>
> In that case, the formerly registered audio driver should be
> unregistered before returning the error from the probe callback.
> Could you fix that?
>

[PATCH] SOUND: riptide.c proper handling of pci_register_driver for joystick

We need to check returning error for pci_register_driver(&joystick_driver)

On failure, we should unregister formerly registered audio drivers

This also fixed the compiler warning :

CC [M] sound/pci/riptide/riptide.o
sound/pci/riptide/riptide.c: In function ‘alsa_card_riptide_init’:
sound/pci/riptide/riptide.c:2200: warning: ignoring return value of ‘__pci_register_driver’, declared with attribute warn_unused_result

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
sound/pci/riptide/riptide.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/pci/riptide/riptide.c b/sound/pci/riptide/riptide.c
index 235a71e..b5ca02e 100644
--- a/sound/pci/riptide/riptide.c
+++ b/sound/pci/riptide/riptide.c
@@ -2197,9 +2197,12 @@ static int __init alsa_card_riptide_init(void)
if (err < 0)
return err;
#if defined(SUPPORT_JOYSTICK)
- pci_register_driver(&joystick_driver);
+ err = pci_register_driver(&joystick_driver);
+ /* On failure unregister formerly registered audio driver */
+ if (err < 0)
+ pci_unregister_driver(&driver);
#endif
- return 0;
+ return err;
}

static void __exit alsa_card_riptide_exit(void)
--
1.6.0.6


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