From 8222b402e2df3b92948141046bae82fb774f3f64 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Sat, 19 Jan 2013 02:02:16 -0700 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- 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 250190fba757..1d17857a2d97 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); -- GitLab