This is a note to let you know that I've just added the patch titled MIPS: pci-legacy: stop using of_pci_range_to_resource to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-pci-legacy-stop-using-of_pci_range_to_resource.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 47f9d776282e7ca271634112fdf743d438fc9df4 Author: Ilya Lipnitskiy <ilya.lipnitskiy@xxxxxxxxx> Date: Tue Apr 13 20:12:37 2021 -0700 MIPS: pci-legacy: stop using of_pci_range_to_resource [ Upstream commit 3ecb9dc1581eebecaee56decac70e35365260866 ] Mirror commit aeba3731b150 ("powerpc/pci: Fix IO space breakage after of_pci_range_to_resource() change"). Most MIPS platforms do not define PCI_IOBASE, nor implement pci_address_to_pio(). Moreover, IO_SPACE_LIMIT is 0xffff for most MIPS platforms. of_pci_range_to_resource passes the _start address_ of the IO range into pci_address_to_pio, which then checks it against IO_SPACE_LIMIT and fails, because for MIPS platforms that use pci-legacy (pci-lantiq, pci-rt3883, pci-mt7620), IO ranges start much higher than 0xffff. In fact, pci-mt7621 in staging already works around this problem, see commit 09dd629eeabb ("staging: mt7621-pci: fix io space and properly set resource limits") So just stop using of_pci_range_to_resource, which does not work for MIPS. Fixes PCI errors like: pci_bus 0000:00: root bus resource [io 0xffffffff] Fixes: 0b0b0893d49b ("of/pci: Fix the conversion of IO ranges into IO resources") Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@xxxxxxxxx> Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx> Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c index 39052de915f3..3a909194284a 100644 --- a/arch/mips/pci/pci-legacy.c +++ b/arch/mips/pci/pci-legacy.c @@ -166,8 +166,13 @@ void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node) res = hose->mem_resource; break; } - if (res != NULL) - of_pci_range_to_resource(&range, node, res); + if (res != NULL) { + res->name = node->full_name; + res->flags = range.flags; + res->start = range.cpu_addr; + res->end = range.cpu_addr + range.size - 1; + res->parent = res->child = res->sibling = NULL; + } } }