Attempts to probe client ntb drivers without ntb hardware present will result in null pointer dereference due to the lack of the ntb bus device being registers. Check to see if this is the case, and fail all calls by the clients registering their drivers.
Signed-off-by: Jon Mason <[email protected]> --- drivers/ntb/ntb_transport.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 250190f..1d17857 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -288,6 +288,9 @@ int ntb_register_client_dev(char *device_name) struct ntb_transport *nt; int rc; + if (list_empty(&ntb_transport_list)) + return -ENODEV; + list_for_each_entry(nt, &ntb_transport_list, entry) { struct device *dev; @@ -336,6 +339,9 @@ int ntb_register_client(struct ntb_client *drv) { drv->driver.bus = &ntb_bus_type; + if (list_empty(&ntb_transport_list)) + return -ENODEV; + return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(ntb_register_client); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
