From 20e006b89856b7e8c1f7c4083a9a5a1a73c78097 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Mon, 29 Jun 2020 17:09:03 +0200 Subject: [PATCH] staging: mmal-vchiq: Always return the param size from param_get mmal-vchiq is a reimplementation of the userland library for MMAL. When getting a parameter, the client provides the storage and the size of the storage. The VPU then returns the size of the parameter that it wished to return, and as much as possible of that parameter is returned to the client. The implementation previously only returned the size provided by the VPU should it exceed the buffer size. So for parameters such as the supported encodings list the client had no idea how much of the provided storage had been populated. Signed-off-by: Dave Stevenson Signed-off-by: Jacopo Mondi Signed-off-by: Nicolas Saenz Julienne Link: https://lore.kernel.org/r/20200629150945.10720-6-nsaenzjulienne@suse.de Signed-off-by: Greg Kroah-Hartman --- drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c index 3bc04f2ea53aa..efdf30b9edf9c 100644 --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c @@ -1282,11 +1282,12 @@ static int port_parameter_get(struct vchiq_mmal_instance *instance, */ memcpy(value, &rmsg->u.port_parameter_get_reply.value, *value_size); - *value_size = rmsg->u.port_parameter_get_reply.size; } else { memcpy(value, &rmsg->u.port_parameter_get_reply.value, rmsg->u.port_parameter_get_reply.size); } + /* Always report the size of the returned parameter to the caller */ + *value_size = rmsg->u.port_parameter_get_reply.size; pr_debug("%s:result:%d component:0x%x port:%d parameter:%d\n", __func__, ret, port->component->handle, port->handle, parameter_id); -- 2.30.2