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Groups > linux.kernel > #1434723

[PATCH 11/13] coresight: delay initialisation when children are missing

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Depending on when CoreSight device are discovered it is possible
that some IP block may be referencing devices that have not been
added to the bus yet.  The end result is missing nodes in the
CoreSight topology even when the devices are present and properly
initialised.

This patch solves the problem by asking the driver core to
try initialising the device at a later time when the children
of a CoreSight node are missing.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/of_coresight.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index b68da1888fd5..18f1c8c4776b 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -166,7 +166,7 @@ struct coresight_platform_data *of_get_coresight_platform_data(
 
 			rdev = of_coresight_get_endpoint_device(rparent);
 			if (!rdev)
-				continue;
+				return ERR_PTR(-EPROBE_DEFER);
 
 			pdata->child_names[i] = dev_name(rdev);
 			pdata->child_ports[i] = rendpoint.id;
-- 
2.7.4

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[PATCH 00/13] coresight: next v4.7-rc5  Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 09/13] coresight: Cleanup TMC status check Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 06/13] coresight: Fix csdev connections initialisation Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 01/13] coresight: access conn->child_name only if it's initialised Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 11/13] coresight: delay initialisation when children are missing Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 04/13] coresight: Remove erroneous dma_free_coherent in tmc_probe Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 10/13] coresight: Add better messages for coresight_timeout Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 02/13] coresight-stm: support mmapping channel regions with mmio_addr Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:30 +0200
  [PATCH 12/13] coresight: document binding acronyms Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:40 +0200
  [PATCH 13/13] coresight: add PM runtime calls to coresight_simple_func() Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-30 18:40 +0200

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