platform/x86/amd/hsmp: Serialize ACPI HSMP probe and remove with an rwsem

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Add hsmp_sock_rwsem and export it, then hold it for write across ACPI
probe, remove and init_acpi() so concurrent per-socket platform probes
cannot race the is_probed handshake or the one-time socket-array
allocation. Use lockdep_assert_held_write() in init_acpi() to catch
incorrect locking under lockdep.

An rw_semaphore is used rather than a plain mutex because an upcoming
change adds a read side so data-plane messages run concurrently with each
other while probe/remove hold it for write to drain in-flight messages.
Introducing it as an rwsem now keeps the lock type stable across that
change.

Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Link: https://patch.msgid.link/20260723094656.3806028-2-muralidhara.mk@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Muralidhara M K 2026-07-23 15:16:51 +05:30 • committed by Ilpo Järvinen

parent 5029bff09e

commit 9c40a57258

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22

drivers/platform/x86/amd/hsmp/acpi.c

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9

drivers/platform/x86/amd/hsmp/hsmp.c

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7

drivers/platform/x86/amd/hsmp/hsmp.h

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