linux-kernel - Re: [PATCH v2 09/10] PCI: aspeed: Add ASPEED PCIe RC driver

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Message-ID: <8fe0f561-ef44-4ec2-9b93-f73105bd67ed@web.de>
Date: Tue, 15 Jul 2025 19:00:27 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Jacky Chou <jacky_chou@...eedtech.com>, linux-aspeed@...ts.ozlabs.org,
 linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Andrew Jeffery <andrew@...econstruct.com.au>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Conor Dooley <conor+dt@...nel.org>,
 Joel Stanley <joel@....id.au>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Linus Walleij <linus.walleij@...aro.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Manivannan Sadhasivam <mani@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, openbmc@...ts.ozlabs.org,
 BMC-SW@...eedtech.com
Subject: Re: [PATCH v2 09/10] PCI: aspeed: Add ASPEED PCIe RC driver

…
> +++ b/drivers/pci/controller/pcie-aspeed.c
> @@ -0,0 +1,1137 @@
…
> +static int aspeed_irq_msi_domain_alloc(struct irq_domain *domain,
> +				       unsigned int virq, unsigned int nr_irqs,
> +				       void *args)
> +{
…
> +	mutex_lock(&pcie->lock);
> +
> +	bit = bitmap_find_free_region(pcie->msi_irq_in_use, MAX_MSI_HOST_IRQS,
> +				      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

Regards,
Markus