evie/android_kernel_oneplus_msm8998
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genirq: Don't allow user space to set IRQ affinity to isolated CPUs

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The PM_QOS_CPU_DMA_LATENCY QOS request attached to an IRQ is ignored
if the IRQ is affined to an isolated CPU. As isolated CPUs enter
deep sleep state, it is better not to affine IRQs to those CPUs.

Change-Id: Ieab4a04eca222b91159208b21bc9e14390ecd62e
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2017-06-16 09:36:34 +05:30
parent 971af7d6ed
commit 7d5479c9b7
1 changed files with 5 additions and 0 deletions
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5
kernel/irq/proc.c
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@ -114,6 +114,11 @@ static ssize_t write_irq_affinity(int type, struct file *file,
goto free_cpumask;
}
if (cpumask_subset(new_value, cpu_isolated_mask)) {
err = -EINVAL;
goto free_cpumask;
}
/*
* Do not allow disabling IRQs completely - it's a too easy
* way to make the system unusable accidentally :-) At least