Re: [PATCH 1/4] cpufreq: qcom-hw: drop affinity hint before freeing the IRQ

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Mon 07 Mar 07:30 PST 2022, Dmitry Baryshkov wrote:

> Drop affinity hint before freeing the throttling IRQ to fix the
> following trace:

Rather than relying on the reader of the git log having to read the
free_irq() implementation to figure out what the problem is, this could
simply state that one isn't allowed to free_irq() something with
affinity set.

Regards,
Bjorn

> 
> [  185.114773] ------------[ cut here ]------------
> [  185.119517] WARNING: CPU: 7 PID: 43 at kernel/irq/manage.c:1887 free_irq+0x3a4/0x3dc
> [  185.127474] Modules linked in:
> [  185.130618] CPU: 7 PID: 43 Comm: cpuhp/7 Tainted: G S      W         5.17.0-rc6-00386-g67382a5b705d-dirty #690
> [  185.147125] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  185.154269] pc : free_irq+0x3a4/0x3dc
> [  185.158031] lr : free_irq+0x33c/0x3dc
> [  185.161792] sp : ffff80000841bc90
> [  185.165195] x29: ffff80000841bc90 x28: ffffa6edc5c3d000 x27: ffff6d93729e5908
> [  185.172515] x26: 0000000000000000 x25: ffff6d910109fc00 x24: ffff6d91011490e0
> [  185.179838] x23: ffff6d9101149218 x22: 0000000000000080 x21: 0000000000000000
> [  185.187163] x20: ffff6d9101149000 x19: ffff6d910ab61500 x18: ffffffffffffffff
> [  185.194487] x17: 2e35202020202020 x16: 2020202020202020 x15: ffff80008841b9a7
> [  185.201805] x14: 00000000000003c9 x13: 0000000000000001 x12: 0000000000000040
> [  185.209135] x11: ffff6d91005aab58 x10: ffff6d91005aab5a x9 : ffffc6a5ad1c5408
> [  185.216455] x8 : ffff6d91005adb88 x7 : 0000000000000000 x6 : ffffc6a5ab5a91f4
> [  185.223776] x5 : 0000000000000000 x4 : ffff6d91011490a8 x3 : ffffc6a5ad266108
> [  185.231098] x2 : 0000000013033204 x1 : ffff6d9101149000 x0 : ffff6d910a9cc000
> [  185.238421] Call trace:
> [  185.240932]  free_irq+0x3a4/0x3dc
> [  185.244334]  qcom_cpufreq_hw_cpu_exit+0x78/0xcc
> [  185.248985]  cpufreq_offline.isra.0+0x228/0x270
> [  185.253639]  cpuhp_cpufreq_offline+0x10/0x20
> [  185.258027]  cpuhp_invoke_callback+0x16c/0x2b0
> [  185.262592]  cpuhp_thread_fun+0x190/0x250
> [  185.266710]  smpboot_thread_fn+0x12c/0x230
> [  185.270914]  kthread+0xfc/0x100
> [  185.274145]  ret_from_fork+0x10/0x20
> [  185.277820] irq event stamp: 212
> [  185.281136] hardirqs last  enabled at (211): [<ffffc6a5ac57973c>] _raw_spin_unlock_irqrestore+0x8c/0xa0
> [  185.290775] hardirqs last disabled at (212): [<ffffc6a5ac572100>] __schedule+0x710/0xa10
> [  185.299081] softirqs last  enabled at (0): [<ffffc6a5ab50f7b0>] copy_process+0x7d0/0x1a14
> [  185.307475] softirqs last disabled at (0): [<0000000000000000>] 0x0
> 
> Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/cpufreq/qcom-cpufreq-hw.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
> index effbb680b453..740518d8ae16 100644
> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> @@ -412,6 +412,7 @@ static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
>  	mutex_unlock(&data->throttle_lock);
>  
>  	cancel_delayed_work_sync(&data->throttle_work);
> +	irq_set_affinity_hint(data->throttle_irq, NULL);
>  	free_irq(data->throttle_irq, data);
>  }
>  
> -- 
> 2.34.1
>