NTB: Handle ntb client device probes without present hardware
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 <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 @@
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 @@
{
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);