linux-kernel - Re: [PATCH] ipmi: Make sure drivers were registered before unregistering them

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Message-id: <4C112AD1.6000308@acm.org>
Date:	Thu, 10 Jun 2010 13:11:29 -0500
From:	Corey Minyard <minyard@....org>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ipmi: Make sure drivers were registered before
 unregistering them

Yes, thanks for this.

Acked-by: Corey Minyard <cminyard@...sta.com>

Matthew Garrett wrote:
> The ipmi code will never register a PCI or Open Firmware driver if
> a hardcoded device is provided by the user. This can cause us to attempt
> to unregister a driver that was never registered, resulting in an oops.
> Keep track of registration in order to avoid this.
>
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> ---
>  drivers/char/ipmi/ipmi_si_intf.c |   21 +++++++++++++++++----
>  1 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 35603dd..311f85b 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -302,6 +302,12 @@ struct smi_info {
>  
>  static int force_kipmid[SI_MAX_PARMS];
>  static int num_force_kipmid;
> +#ifdef CONFIG_PCI
> +static int pci_registered;
> +#endif
> +#ifdef CONFIG_PPC_OF
> +static int of_registered;
> +#endif
>  
>  static unsigned int kipmid_max_busy_us[SI_MAX_PARMS];
>  static int num_max_busy_us;
> @@ -3314,6 +3320,8 @@ static __devinit int init_ipmi_si(void)
>  	rv = pci_register_driver(&ipmi_pci_driver);
>  	if (rv)
>  		printk(KERN_ERR PFX "Unable to register PCI driver: %d\n", rv);
> +	else
> +		pci_registered = 1;
>  #endif
>  
>  #ifdef CONFIG_ACPI
> @@ -3330,6 +3338,7 @@ static __devinit int init_ipmi_si(void)
>  
>  #ifdef CONFIG_PPC_OF
>  	of_register_platform_driver(&ipmi_of_platform_driver);
> +	of_registered = 1;
>  #endif
>  
>  	/* We prefer devices with interrupts, but in the case of a machine
> @@ -3383,11 +3392,13 @@ static __devinit int init_ipmi_si(void)
>  	if (unload_when_empty && list_empty(&smi_infos)) {
>  		mutex_unlock(&smi_infos_lock);
>  #ifdef CONFIG_PCI
> -		pci_unregister_driver(&ipmi_pci_driver);
> +		if (pci_registered)
> +			pci_unregister_driver(&ipmi_pci_driver);
>  #endif
>  
>  #ifdef CONFIG_PPC_OF
> -		of_unregister_platform_driver(&ipmi_of_platform_driver);
> +		if (of_registered)
> +			of_unregister_platform_driver(&ipmi_of_platform_driver);
>  #endif
>  		driver_unregister(&ipmi_driver.driver);
>  		printk(KERN_WARNING PFX
> @@ -3478,14 +3489,16 @@ static __exit void cleanup_ipmi_si(void)
>  		return;
>  
>  #ifdef CONFIG_PCI
> -	pci_unregister_driver(&ipmi_pci_driver);
> +	if (pci_registered)
> +		pci_unregister_driver(&ipmi_pci_driver);
>  #endif
>  #ifdef CONFIG_ACPI
>  	pnp_unregister_driver(&ipmi_pnp_driver);
>  #endif
>  
>  #ifdef CONFIG_PPC_OF
> -	of_unregister_platform_driver(&ipmi_of_platform_driver);
> +	if (of_registered)
> +		of_unregister_platform_driver(&ipmi_of_platform_driver);
>  #endif
>  
>  	mutex_lock(&smi_infos_lock);
>   

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