coresight: Only register perf symlink for sinks with alloc_buffer

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[ Upstream commit 12d9a9dd9d ]

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: 9d3ba0b6c0 ("Coresight: Add coresight dummy driver")
Signed-off-by: Yuanfang Zhang <quic_yuanfang@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250630-etm_perf_sink-v1-1-e4a7211f9ad7@quicinc.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Yuanfang Zhang 2025-06-30 18:26:19 +08:00 • committed by Greg Kroah-Hartman

parent ebbb891f63

commit 9ca1f214a3

1 changed files with 3 additions and 2 deletions

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drivers/hwtracing/coresight/coresight-core.c

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