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staging: unisys: stop device registration before visorbus registration

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In cases where visorbus is compiled directly into the kernel, if
visorbus registration fails for any reason, it is still possible for
other drivers to call visorbus_register_visor_driver(), which could
cause an oops. Prevent this by saving the result of the call to
create_bus() in a static variable, and return an error code when the bus
hasn't been registered successfully.

Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Benjamin Romer 2015-09-04 12:01:32 -04:00 committed by Greg Kroah-Hartman
parent 418627ddc6
commit 6155a3cf11
1 changed files with 7 additions and 4 deletions
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11
drivers/staging/unisys/visorbus/visorbus_main.c
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@ -37,6 +37,8 @@ static int visorbus_debugref;
#define POLLJIFFIES_TESTWORK 100
#define POLLJIFFIES_NORMALCHANNEL 10
static int busreg_rc = -ENODEV; /* stores the result from bus registration */
static int visorbus_uevent(struct device *xdev, struct kobj_uevent_env *env);
static int visorbus_match(struct device *xdev, struct device_driver *xdrv);
static void fix_vbus_dev_info(struct visor_device *visordev);
@ -863,6 +865,9 @@ int visorbus_register_visor_driver(struct visor_driver *drv)
{
int rc = 0;
if (busreg_rc < 0)
return -ENODEV; /*can't register on a nonexistent bus*/
drv->driver.name = drv->name;
drv->driver.bus = &visorbus_type;
drv->driver.probe = visordriver_probe_device;
@ -1262,10 +1267,8 @@ remove_bus_instance(struct visor_device *dev)
static int
create_bus_type(void)
{
int rc = 0;
rc = bus_register(&visorbus_type);
return rc;
busreg_rc = bus_register(&visorbus_type);
return busreg_rc;
}
/** Remove the one-and-only one instance of the visor bus type (visorbus_type).