> This patch adds Altera PCIe MSI driver. This soft IP supports configurable
> number of vectors, which is a dts parameter.
>
> Signed-off-by: Ley Foon Tan <lf...@altera.com>
> Reviewed-by: Marc Zyngier <marc.zyng...@arm.com>
> +
> +static inline void msi_writel(struct altera_msi *msi, u32 value, u32 reg)
> +{
> + writel_relaxed(value, msi->csr_base + reg);
> +}
> +
> +static inline u32 msi_readl(struct altera_msi *msi, u32 reg)
> +{
> + return readl_relaxed(msi->csr_base + reg);
> +}
> +
You could set value and reg parameter as const
> +
> +static int altera_irq_domain_alloc(struct irq_domain *domain, unsigned int
> virq,
> + unsigned int nr_irqs, void *args)
> +{
> + struct altera_msi *msi = domain->host_data;
> + unsigned long bit;
> + u32 mask;
> +
> + WARN_ON(nr_irqs != 1);
> + mutex_lock(&msi->lock);
> +
> + bit = find_first_zero_bit(msi->used, msi->num_of_vectors);
> + if (bit >= msi->num_of_vectors)
> + return -ENOSPC;
> +
> + set_bit(bit, msi->used);
> +
> + mutex_unlock(&msi->lock);
> +
> + irq_domain_set_info(domain, virq, bit, &altera_msi_bottom_irq_chip,
> + domain->host_data, handle_simple_irq,
> + NULL, NULL);
> +
> + mask = msi_readl(msi, MSI_INTMASK);
> + mask |= 1 << bit;
> + msi_writel(msi, mask, MSI_INTMASK);
> +
> + return 0;
> +}
You do not unlock the mutex when returning -ENOSPC
And again some parameter could be set as const
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