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Date: Tue, 6 Sep 2016 12:20:09 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Tomasz Nowicki <tn@...ihalf.com> cc: marc.zyngier@....com, jason@...edaemon.net, rjw@...ysocki.net, helgaas@...nel.org, rafael@...nel.org, Lorenzo.Pieralisi@....com, will.deacon@....com, catalin.marinas@....com, hanjun.guo@...aro.org, shijie.huang@....com, robert.richter@...iumnetworks.com, mw@...ihalf.com, linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org, andrea.gallo@...aro.org, linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, al.stone@...aro.org, graeme.gregory@...aro.org, ddaney.cavm@...il.com, okaya@...eaurora.org Subject: Re: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI domain handling On Tue, 6 Sep 2016, Tomasz Nowicki wrote: > +/** > + * iort_get_device_domain() - Find MSI domain related to a device > + * @dev: The device. > + * @req_id: Requester ID for the device. > + * > + * Returns: the MSI domain for this device, NULL otherwise > + */ > +struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) > +{ > + static struct fwnode_handle *handle; static ?????? > + int its_id; > + > + if (iort_dev_find_its_id(dev, req_id, 0, &its_id)) > + return NULL; > + > + handle = iort_find_domain_token(its_id); You reevaluate that on every call. Thanks, tglx
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