On Tue, Jun 05, 2018 at 10:43:14PM +0100, Suzuki K Poulose wrote:
> When parsing the remote endpoint of an output port, we do :
> rport = of_graph_get_remote_port(ep);
> rparent = of_graph_get_remote_port_parent(ep);
>
> and then parse the "remote_port" as if it was the remote endpoint,
> which is wrong. The code worked fine because we used endpoint number
> as the port number. Let us fix it and optimise a bit as:
>
> remote_ep = of_graph_get_remote_endpoint(ep);
> if (remote_ep)
> remote_parent = of_graph_get_port_parent(remote_ep);
>
> and then, parse the remote_ep for the port/endpoint details.
>
> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> ---
> drivers/hwtracing/coresight/of_coresight.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index 8a23c63..ada4f07 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -129,7 +129,7 @@ static int of_coresight_parse_endpoint(struct device_node *ep,
> int ret = 0;
> struct of_endpoint endpoint, rendpoint;
> struct device_node *rparent = NULL;
> - struct device_node *rport = NULL;
> + struct device_node *rep = NULL;
> struct device *rdev = NULL;
>
> do {
> @@ -144,16 +144,16 @@ static int of_coresight_parse_endpoint(struct device_node *ep,
> if (of_graph_parse_endpoint(ep, &endpoint))
> break;
> /*
> - * Get a handle on the remote port and parent
> - * attached to it.
> + * Get a handle on the remote endpoint and the device it is
> + * attached to.
> */
> - rparent = of_graph_get_remote_port_parent(ep);
> + rep = of_graph_get_remote_endpoint(ep);
> + if (!rep)
> + break;
> + rparent = of_graph_get_port_parent(rep);
> if (!rparent)
> break;
> - rport = of_graph_get_remote_port(ep);
> - if (!rport)
> - break;
> - if (of_graph_parse_endpoint(rport, &rendpoint))
> + if (of_graph_parse_endpoint(rep, &rendpoint))
> break;
>
> /* If the remote device is not available, defer probing */
> @@ -165,15 +165,15 @@ static int of_coresight_parse_endpoint(struct device_node *ep,
>
> pdata->outports[*i] = endpoint.port;
> pdata->child_names[*i] = dev_name(rdev);
> - pdata->child_ports[*i] = rendpoint.id;
> + pdata->child_ports[*i] = rendpoint.port;
> /* Move the index */
> (*i)++;
> } while (0);
>
> if (rparent)
> of_node_put(rparent);
> - if (rport)
> - of_node_put(rport);
> + if (rep)
> + of_node_put(rep);
>
> return ret;
> }
Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
(Please add to the next iteration so that I don't have to review again)
> --
> 2.7.4
>
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