perf/x86/intel/uncore: Guard against invalid box control address

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Theoretically, intel_uncore_find_discovery_unit() could return NULL,
e.g., when a CPU die is offline during uncore enumeration and its PMU
units are not added to the discovery RB-tree.

Guard against a NULL return value and the resulting invalid box control
address (0) before accessing hardware.

Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://patch.msgid.link/20260602144908.263680-3-zide.chen@intel.com

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Zide Chen 2026-06-02 07:49:03 -07:00 • committed by Peter Zijlstra

parent 63f48abd55

commit 3c19ea24f0

1 changed files with 24 additions and 9 deletions

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arch/x86/events/intel/uncore_discovery.c

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