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ARM: 6742/1: pmu: avoid setting IRQ affinity on UP systems

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Now that we can execute a CONFIG_SMP kernel on a uniprocessor system,
extra care has to be taken in the PMU IRQ affinity setting code to
ensure that we don't always fail to initialise.

This patch changes the CPU PMU initialisation code so that when we
only have a single IRQ, whose affinity can not be changed at the
controller, we report success (0) rather than -EINVAL.

Reported-by: Avik Sil <avik.sil@linaro.org>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2011-02-18 16:21:06 +01:00 committed by Russell King
parent 885028e4ba
commit 71efb063f4
1 changed files with 14 additions and 8 deletions
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22
arch/arm/kernel/pmu.c
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@ -97,28 +97,34 @@ set_irq_affinity(int irq,
irq, cpu);
return err;
#else
return 0;
return -EINVAL;
#endif
}
static int
init_cpu_pmu(void)
{
int i, err = 0;
int i, irqs, err = 0;
struct platform_device *pdev = pmu_devices[ARM_PMU_DEVICE_CPU];
if (!pdev) {
err = -ENODEV;
goto out;
}
if (!pdev)
return -ENODEV;
for (i = 0; i < pdev->num_resources; ++i) {
irqs = pdev->num_resources;
/*
* If we have a single PMU interrupt that we can't shift, assume that
* we're running on a uniprocessor machine and continue.
*/
if (irqs == 1 && !irq_can_set_affinity(platform_get_irq(pdev, 0)))
return 0;
for (i = 0; i < irqs; ++i) {
err = set_irq_affinity(platform_get_irq(pdev, i), i);
if (err)
break;
}
out:
return err;
}