Good afternoon,
On Thu, Jul 19, 2018 at 11:55:06AM +0100, Suzuki K Poulose wrote:
Refactor the of graph endpoint parsing code, to make the error handling easier.
Cc: Mathieu Poirier mathieu.poirier@linaro.org Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com
Changes since v1:
- Splitted from the of_node refcounting fix, part1
drivers/hwtracing/coresight/of_coresight.c | 129 +++++++++++++++++------------ 1 file changed, 75 insertions(+), 54 deletions(-)
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c index 6880bee..68faaf8 100644 --- a/drivers/hwtracing/coresight/of_coresight.c +++ b/drivers/hwtracing/coresight/of_coresight.c @@ -114,17 +114,69 @@ int of_coresight_get_cpu(const struct device_node *node) } EXPORT_SYMBOL_GPL(of_coresight_get_cpu); +/*
- of_coresight_parse_endpoint : Parse the given output endpoint @ep
- and fill the connection information in @pdata[*@i].
- Parses the local port, remote device name and the remote port. Also
- updates *@i to point to the next index, when an entry is added.
- Returns :
0 - If the parsing completed without any fatal errors.
- -Errno - Fatal error, abort the scanning.
- */
+static int of_coresight_parse_endpoint(struct device *dev,
struct device_node *ep,struct coresight_platform_data *pdata,int *i)+{
- int ret = 0;
- struct of_endpoint endpoint, rendpoint;
- struct device_node *rparent = NULL;
- struct device_node *rport = NULL;
- struct device *rdev = NULL;
- do {
/* Parse the local port details */if (of_graph_parse_endpoint(ep, &endpoint))break;/** Get a handle on the remote port and parent* attached to it.*/rparent = of_graph_get_remote_port_parent(ep);if (!rparent)break;rport = of_graph_get_remote_port(ep);if (!rport)break;if (of_graph_parse_endpoint(rport, &rendpoint))break;/* If the remote device is not available, defer probing */rdev = of_coresight_get_endpoint_device(rparent);if (!rdev) {ret = -EPROBE_DEFER;break;}pdata->outports[*i] = endpoint.port;pdata->child_names[*i] = dev_name(rdev);pdata->child_ports[*i] = rendpoint.id;/* Move the index */(*i)++;
Not a big fan, makes the code needlessly complex. Incrementation of the index can be done in the while loop of of_get_coresight_platform_data(). See below.
- } while (0);
- return ret;
+}
struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const struct device_node *node) { int i = 0, ret = 0; struct coresight_platform_data *pdata;
- struct of_endpoint endpoint, rendpoint;
- struct device *rdev; struct device_node *ep = NULL;
- struct device_node *rparent = NULL;
- struct device_node *rport = NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) @@ -132,64 +184,33 @@ of_get_coresight_platform_data(struct device *dev, /* Use device name as sysfs handle */ pdata->name = dev_name(dev);
- pdata->cpu = of_coresight_get_cpu(node);
/* Get the number of input and output port for this component */ of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
- if (pdata->nr_outport) {
ret = of_coresight_alloc_memory(dev, pdata);
- /* If there are no output connections, we are done */
- if (!pdata->nr_outport)
return pdata;- ret = of_coresight_alloc_memory(dev, pdata);
- if (ret)
return ERR_PTR(ret);- /* Iterate through each port to discover topology */
- while ((ep = of_graph_get_next_endpoint(node, ep))) {
/** No need to deal with input ports, processing for as* processing for output ports will deal with them.*/
This comment has been broken for a while... It should read:
/* * No need to deal with input ports, as processing * for output ports will deal with them. */
if (of_find_property(ep, "slave-mode", NULL))continue;ret = of_coresight_parse_endpoint(dev, ep, pdata, &i);
i++;
/* Iterate through each port to discover topology */do {/* Get a handle on a port */ep = of_graph_get_next_endpoint(node, ep);if (!ep)break;/** No need to deal with input ports, processing for as* processing for output ports will deal with them.*/if (of_find_property(ep, "slave-mode", NULL))continue;/* Get a handle on the local endpoint */ret = of_graph_parse_endpoint(ep, &endpoint);if (ret)continue;/* The local out port number */pdata->outports[i] = endpoint.port;/** Get a handle on the remote port and parent* attached to it.*/rparent = of_graph_get_remote_port_parent(ep);rport = of_graph_get_remote_port(ep);if (!rparent || !rport)continue;if (of_graph_parse_endpoint(rport, &rendpoint))continue;rdev = of_coresight_get_endpoint_device(rparent);if (!rdev)return ERR_PTR(-EPROBE_DEFER);pdata->child_names[i] = dev_name(rdev);pdata->child_ports[i] = rendpoint.id;i++;} while (ep);
- pdata->cpu = of_coresight_get_cpu(node);
- return pdata;
} EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); -- 2.7.4