greybus: svc: error out only for smaller payloads received

!= was used in place of <, while comparing expected and actual payload
size. The module may be running a higher version of the protocol and
might have some extra fields (towards the end) in the structure, and the
AP needs to ignore them.

This also updates the print (expected-payload-size <
actual-payload-size), when the size doesn't match for requests received
by the module. This gives more details required for debugging.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/svc.c b/drivers/staging/greybus/svc.c
index 7ac45a9..17ffb13 100644 (file)
--- a/drivers/staging/greybus/svc.c
+++ b/drivers/staging/greybus/svc.c
@@ -193,8 +193,8 @@ static int gb_svc_hello(struct gb_operation *op)
         * SVC sends information about the endo and interface-id on the hello
         * request, use that to create an endo.
         */
-       if (op->request->payload_size != sizeof(*hello_request)) {
-               dev_err(dev, "%s: Illegal size of hello request (%zu %zu)\n",
+       if (op->request->payload_size < sizeof(*hello_request)) {
+               dev_err(dev, "%s: Illegal size of hello request (%zu < %zu)\n",
                        __func__, op->request->payload_size,
                        sizeof(*hello_request));
                return -EINVAL;