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irqchip/gic-v3-its: Skip HP notifier when no ITS is registered

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We have some systems out there that have both LPI support and an
ITS, but that don't expose the ITS in their firmware tables
(either because it is broken or because they run under a hypervisor
that hides it...).

Is such a configuration, we still register the HP notifier to free
the allocated tables if needed, resulting in a warning as there is
no memory to free (nothing was allocated the first place).

Fix it by keying the HP notifier on the presence of at least one
sucessfully probed ITS.

Fixes: d23bc2bc1d ("irqchip/gic-v3-its: Postpone LPI pending table freeing and memreserve")
Reported-by: Steev Klimaszewski <steev@kali.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lore.kernel.org/r/20220202103454.2480465-1-maz@kernel.org
This commit is contained in:
Marc Zyngier 2022-02-02 10:34:54 +00:00
parent 26291c54e1
commit eba1e44bee
1 changed files with 3 additions and 0 deletions
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3
drivers/irqchip/irq-gic-v3-its.c
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@ -5517,6 +5517,9 @@ int __init its_lpi_memreserve_init(void)
if (!efi_enabled(EFI_CONFIG_TABLES))
return 0;
if (list_empty(&its_nodes))
return 0;
gic_rdists->cpuhp_memreserve_state = CPUHP_INVALID;
state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"irqchip/arm/gicv3/memreserve:online",