Hi Markus,

Thank you for your reply.

quoted

+++ b/drivers/pci/controller/pcie-aspeed.c

@@ -0,0 +1,1137 @@

…

quoted

+static int aspeed_irq_msi_domain_alloc(struct irq_domain *domain,
+				       unsigned int virq, unsigned int nr_irqs,
+				       void *args)
+{

…

quoted

+	mutex_lock(&pcie->lock);
+
+	bit = bitmap_find_free_region(pcie->msi_irq_in_use,

MAX_MSI_HOST_IRQS,

quoted

+				      get_count_order(nr_irqs));
+
+	mutex_unlock(&pcie->lock);

…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&pcie->lock);”?
https://elixir.bootlin.com/linux/v6.16-rc6/source/include/linux/mutex.h#L225

Thanks for the information that made me know this method.
I just referred to the existed drivers in Linux before, and it seems there are a lot of drivers keeping the original usage.
So, I have no idea Linux have introduced these methods.
I will take care of these usages in my develop and will change it in this driver in next version.

Thanks,
Jacky