On Wed, 25 Jul 2018 at 03:01, Suzuki K Poulose suzuki.poulose@arm.com wrote:
On 07/24/2018 10:34 PM, Mathieu Poirier wrote:
On Tue, 24 Jul 2018 at 15:30, Mathieu Poirier mathieu.poirier@linaro.org wrote:
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.
Me neither..
Void that - it properly deals with the first of_parse_endpoint().
Or may be we could do something with the return value :
1 - Successfully parsed and populated a connection entry 0 - No errors in parsing < 0 - Errors in parsing
Right, that is another solution. I usually try to avoid those but I think it is better than what we currently have.
@@ -132,64 +184,33 @@ of_get_coresight_platform_data(struct device *dev,
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. */Sure, will fix it.
Thanks, Mathieu
Suzuki
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