linux-kernel - [PATCH] SOUND: riptide.c proper handling of pci_register

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Date:	Wed, 15 Jul 2009 16:45:40 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] SOUND: riptide.c proper handling of pci_register_driver
 for joystick

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@...il.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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