greybus: sdio: 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>

drivers/staging/greybus/sdio.c

@@ -192,8 +192,9 @@ static int gb_sdio_event_recv(u8 type, struct gb_operation *op)
 
 	request = op->request;
 
-	if (request->payload_size != sizeof(*payload)) {
-		dev_err(mmc_dev(host->mmc), "wrong event size received\n");
+	if (request->payload_size < sizeof(*payload)) {
+		dev_err(mmc_dev(host->mmc), "wrong event size received (%zu < %zu)\n",
+			request->payload_size, sizeof(*payload));
 		return -EINVAL;
 	}