CVE-2026-43311

In the Linux kernel, the following vulnerability has been resolved:

soc/tegra: pmc: Fix unsafe generic_handle_irq() call

Currently, when resuming from system suspend on Tegra platforms,

the following warning is observed:

WARNING: CPU: 0 PID: 14459 at kernel/irq/irqdesc.c:666

Call trace:

handle_irq_desc+0x20/0x58 (P)

tegra186_pmc_wake_syscore_resume+0xe4/0x15c

syscore_resume+0x3c/0xb8

suspend_devices_and_enter+0x510/0x540

pm_suspend+0x16c/0x1d8

The warning occurs because generic_handle_irq() is being called from

a non-interrupt context which is considered as unsafe.

Fix this warning by deferring generic_handle_irq() call to an IRQ work

which gets executed in hard IRQ context where generic_handle_irq()

can be called safely.

When PREEMPT_RT kernels are used, regular IRQ work (initialized with

init_irq_work) is deferred to run in per-CPU kthreads in preemptible

context rather than hard IRQ context. Hence, use the IRQ_WORK_INIT_HARD

variant so that with PREEMPT_RT kernels, the IRQ work is processed in

hardirq context instead of being deferred to a thread which is required

for calling generic_handle_irq().

On non-PREEMPT_RT kernels, both init_irq_work() and IRQ_WORK_INIT_HARD()

execute in IRQ context, so this change has no functional impact for

standard kernel configurations.

[[email protected]: miscellaneous cleanups]