perf/arm_cspmu: Improve sub-module error reporting

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When waiting for a sub-module to register, we return a bare
-EPROBE_DEFER that ends up showing the end user:

  platform arm-cs-arch-pmu.1: deferred probe pending (no reason)

wherein it's not necessarily clear that they might need to take some
action to ensure the appropriate module is available to load. Let's use
dev_err_probe() here so we can show exactly what we're waiting for.

Similarly, in the case where something's gone horribly wrong with an
already-registered module, we can use dev_WARN() to standardise the
device/driver attribution rather than just open-coding "arm_cspmu".

Reviewed-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Robin Murphy 2026-07-16 15:56:36 +01:00 • committed by Will Deacon

parent 745a724f9c

commit 60b234db6b

1 changed files with 4 additions and 2 deletions

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drivers/perf/arm_cspmu/arm_cspmu.c

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