Re: [PATCH v5 2/6] PCI: iproc: Add INTx support with better modeling

[Arnd Bergmann]

On Thu, Mar 26, 2020 at 7:49 AM Srinath Mannam
<srinath.mannam@xxxxxxxxxxxx> wrote:
> -static void iproc_pcie_enable(struct iproc_pcie *pcie)
> +static void iproc_pcie_mask_irq(struct irq_data *d)
>  {
> +       struct iproc_pcie *pcie = irq_data_get_irq_chip_data(d);
> +       u32 val;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&pcie->intx_lock, flags);
> +       val =  iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_EN);
> +       val &= ~(BIT(irqd_to_hwirq(d)));
> +       iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, val);
> +       spin_unlock_irqrestore(&pcie->intx_lock, flags);
> +}

I think these need to use a raw spinlock, or you get problems with
PREEMPT_RT

     Arnd