4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner tglx@linutronix.de
commit 45d55e7bac4028af93f5fa324e69958a0b868e96 upstream.
Keith reported the following warning:
WARNING: CPU: 28 PID: 1420 at kernel/irq/matrix.c:222 irq_matrix_remove_managed+0x10f/0x120 x86_vector_free_irqs+0xa1/0x180 x86_vector_alloc_irqs+0x1e4/0x3a0 msi_domain_alloc+0x62/0x130
The reason for this is that if the vector allocation fails the error handling code tries to free the failed vector as well, which causes the above imbalance warning to trigger.
Adjust the error path to handle this correctly.
Fixes: b5dc8e6c21e7 ("x86/irq: Use hierarchical irqdomain to manage CPU interrupt vectors") Reported-by: Keith Busch keith.busch@intel.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Keith Busch keith.busch@intel.com Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801161217300.1823@nanos Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/apic/vector.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -361,14 +361,17 @@ static int x86_vector_alloc_irqs(struct irq_data->chip_data = data; irq_data->hwirq = virq + i; err = assign_irq_vector_policy(virq + i, node, data, info); - if (err) + if (err) { + irq_data->chip_data = NULL; + free_apic_chip_data(data); goto error; + } }
return 0;
error: - x86_vector_free_irqs(domain, virq, i + 1); + x86_vector_free_irqs(domain, virq, i); return err; }