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coresight: Use helpers to fetch first and last nodes

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Replace open code with coresight_path_first_node() and
coresight_path_last_node() for fetching the nodes.

Check that the node is not NULL before accessing csdev field.

Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-17-f88c4a3ecfe9@arm.com
This commit is contained in:
Leo Yan 2026-05-15 21:08:24 +01:00 committed by Suzuki K Poulose
parent 3d3289c0d8
commit 0724585ace
1 changed files with 12 additions and 2 deletions
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14
drivers/hwtracing/coresight/coresight-core.c
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@ -174,11 +174,16 @@ void coresight_put_percpu_source_ref(struct coresight_device *csdev)
struct coresight_device *coresight_get_source(struct coresight_path *path)
{
struct coresight_device *csdev;
struct coresight_node *nd;
if (!path)
return NULL;
csdev = list_first_entry(&path->path_list, struct coresight_node, link)->csdev;
nd = coresight_path_first_node(path);
if (!nd)
return NULL;
csdev = nd->csdev;
if (!coresight_is_device_source(csdev))
return NULL;
@ -711,11 +716,16 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode)
struct coresight_device *coresight_get_sink(struct coresight_path *path)
{
struct coresight_device *csdev;
struct coresight_node *nd;
if (!path)
return NULL;
csdev = list_last_entry(&path->path_list, struct coresight_node, link)->csdev;
nd = coresight_path_last_node(path);
if (!nd)
return NULL;
csdev = nd->csdev;
if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
return NULL;