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Date: Sat, 8 Mar 2014 18:15:08 +0100 From: Arnd Bergmann <arnd@...db.de> To: Liviu Dudau <Liviu.Dudau@....com> Cc: "linux-pci" <linux-pci@...r.kernel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Catalin Marinas <Catalin.Marinas@....com>, Will Deacon <Will.Deacon@....com>, "linaro-kernel" <linaro-kernel@...ts.linaro.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, LKML <linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, LAKML <linux-arm-kernel@...ts.infradead.org>, Tanmay Inamdar <tinamdar@....com> Subject: Re: [PATCH v6 6/6] pci: Add support for creating a generic host_bridge from device tree On Wednesday 05 March 2014, Liviu Dudau wrote: > + > + pr_debug("Parsing ranges property...\n"); > + for_each_of_pci_range(&parser, &range) { > + /* Read next ranges element */ > + pr_debug("pci_space: 0x%08x pci_addr:0x%016llx ", > + range.pci_space, range.pci_addr); > + pr_debug("cpu_addr:0x%016llx size:0x%016llx\n", > + range.cpu_addr, range.size); > + > + /* > + * If we failed translation or got a zero-sized region > + * then skip this range > + */ > + if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) > + continue; > + > + res = kzalloc(sizeof(struct resource), GFP_KERNEL); > + if (!res) > + return -ENOMEM; > + > + of_pci_range_to_resource(&range, dev, res); > + > + if (resource_type(res) == IORESOURCE_IO) > + *io_base = range.cpu_addr; > + > + pci_add_resource_offset(resources, res, > + res->start - range.pci_addr); > + } As mentioned regarding the pci_register_io_range() helper, x86 would not enter the 'resource_type(res) == IORESOURCE_IO' code path, which on the one hand is fine so we can return an error from pci_register_io_range() there, but I think it will lead to io_base getting an uninitialized content. There could also be other reasons why pci_register_io_range() fails, e.g. because the space is exhausted, and I think we should try to catch that here and skip the pci_add_resource_offset() and io_base assignment then. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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