Ensure that etm_perf_add_symlink_sink() is only called for devices that implement the alloc_buffer operation. This prevents invalid symlink creation for dummy sinks that do not implement alloc_buffer.

Without this check, perf may attempt to use a dummy sink that lacks alloc_buffer operationsu to initialise perf's ring buffer, leading to runtime failures.

Fixes: 9d3ba0b6c0569 ("Coresight: Add coresight dummy driver") Signed-off-by: Yuanfang Zhang quic_yuanfang@quicinc.com --- drivers/hwtracing/coresight/coresight-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index fa758cc21827552a5c97b6bdd05d22dec4994b22..fddf04c5ee46eb4d559416296f7e85ce6c5689fa 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1374,8 +1374,9 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) goto out_unlock; }

- if (csdev->type == CORESIGHT_DEV_TYPE_SINK || - csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) { + if ((csdev->type == CORESIGHT_DEV_TYPE_SINK || + csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) && + sink_ops(csdev)->alloc_buffer) { ret = etm_perf_add_symlink_sink(csdev);

if (ret) {

--- base-commit: 408c97c4a5e0b634dcd15bf8b8808b382e888164 change-id: 20250630-etm_perf_sink-ee0fcffc6820

Best regards,