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ipmi: make sure drivers were registered before unregistering them 

The ipmi code will never register a PCI or Open Firmware driver if a
hardcoded device is provided by the user by providing device addresses via
the module parameters.  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.

Fixes a post-2.6.34 regression.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Garrett 2010-06-29 15:05:29 -07:00 committed by Linus Torvalds
parent e05bd3367b
commit 56480287f9
1 changed files with 17 additions and 4 deletions
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21
drivers/char/ipmi/ipmi_si_intf.c
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@ -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);