Commit 56480287 authored by Matthew Garrett's avatar Matthew Garrett Committed by Linus Torvalds
Browse files

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: default avatarMatthew Garrett <mjg@redhat.com>
Acked-by: default avatarCorey Minyard <cminyard@mvista.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e05bd336
......@@ -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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