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Date: Tue, 24 Mar 2009 17:26:44 -0700 From: Greg Kroah-Hartman <gregkh@...e.de> To: linux-kernel@...r.kernel.org Cc: Dave Young <hidave.darkstar@...il.com>, Greg Kroah-Hartman <gregkh@...e.de> Subject: [PATCH 40/61] driver-core: do not register a driver with bus_type not registered From: Dave Young <hidave.darkstar@...il.com> If the bus_type is not registerd, driver_register to that bus will cause oops. I found this bug when test built-in usb serial drivers (ie. aircable driver) with 'nousb' cmdline params. In this patch: 1. set the bus->p=NULL when bus_register failed and unregisterd. 2. if bus->p is NULL, driver_register BUG_ON will be triggered. Signed-off-by: Dave Young <hidave.darkstar@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- drivers/base/bus.c | 2 ++ drivers/base/driver.c | 2 ++ 2 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 8547b78..11463c0 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -932,6 +932,7 @@ bus_uevent_fail: kset_unregister(&bus->p->subsys); kfree(bus->p); out: + bus->p = NULL; return retval; } EXPORT_SYMBOL_GPL(bus_register); @@ -953,6 +954,7 @@ void bus_unregister(struct bus_type *bus) bus_remove_file(bus, &bus_attr_uevent); kset_unregister(&bus->p->subsys); kfree(bus->p); + bus->p = NULL; } EXPORT_SYMBOL_GPL(bus_unregister); diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 1e2bda7..2889ad5 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -216,6 +216,8 @@ int driver_register(struct device_driver *drv) int ret; struct device_driver *other; + BUG_ON(!drv->bus->p); + if ((drv->bus->probe && drv->probe) || (drv->bus->remove && drv->remove) || (drv->bus->shutdown && drv->shutdown)) -- 1.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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