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net: mvpp2: Fix affinity hint allocation 

The mvpp2 driver has the curious behaviour of passing a stack variable
to irq_set_affinity_hint(), which results in the kernel exploding
the first time anyone accesses this information. News flash: userspace
does, and irqbalance will happily take the machine down. Great stuff.

An easy fix is to track the mask within the queue_vector structure,
and to make sure it has the same lifetime as the interrupt itself.

Fixes: e531f76757 ("net: mvpp2: handle cases where more CPUs are available than s/w threads")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marc Zyngier 2018-10-30 15:41:00 +00:00 committed by David S. Miller
parent 3aa8029e1a
commit a6b3a3fa04
2 changed files with 15 additions and 4 deletions
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1
drivers/net/ethernet/marvell/mvpp2/mvpp2.h
View File

@ -796,6 +796,7 @@ struct mvpp2_queue_vector {
int nrxqs;
u32 pending_cause_rx;
struct mvpp2_port *port;
struct cpumask *mask;
};
struct mvpp2_port {

18
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
View File

@ -3298,24 +3298,30 @@ static int mvpp2_irqs_init(struct mvpp2_port *port)
for (i = 0; i < port->nqvecs; i++) {
struct mvpp2_queue_vector *qv = port->qvecs + i;
if (qv->type == MVPP2_QUEUE_VECTOR_PRIVATE)
if (qv->type == MVPP2_QUEUE_VECTOR_PRIVATE) {
qv->mask = kzalloc(cpumask_size(), GFP_KERNEL);
if (!qv->mask) {
err = -ENOMEM;
goto err;
}
irq_set_status_flags(qv->irq, IRQ_NO_BALANCING);
}
err = request_irq(qv->irq, mvpp2_isr, 0, port->dev->name, qv);
if (err)
goto err;
if (qv->type == MVPP2_QUEUE_VECTOR_PRIVATE) {
unsigned long mask = 0;
unsigned int cpu;
for_each_present_cpu(cpu) {
if (mvpp2_cpu_to_thread(port->priv, cpu) ==
qv->sw_thread_id)
mask |= BIT(cpu);
cpumask_set_cpu(cpu, qv->mask);
}
irq_set_affinity_hint(qv->irq, to_cpumask(&mask));
irq_set_affinity_hint(qv->irq, qv->mask);
}
}
@ -3325,6 +3331,8 @@ err:
struct mvpp2_queue_vector *qv = port->qvecs + i;
irq_set_affinity_hint(qv->irq, NULL);
kfree(qv->mask);
qv->mask = NULL;
free_irq(qv->irq, qv);
}
@ -3339,6 +3347,8 @@ static void mvpp2_irqs_deinit(struct mvpp2_port *port)
struct mvpp2_queue_vector *qv = port->qvecs + i;
irq_set_affinity_hint(qv->irq, NULL);
kfree(qv->mask);
qv->mask = NULL;
irq_clear_status_flags(qv->irq, IRQ_NO_BALANCING);
free_irq(qv->irq, qv);
}