From 0b26cd69480d4d99f39042c6621a05af7496b3da Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 21 Sep 2015 18:26:45 -0500 Subject: [PATCH] PCI: Clear IORESOURCE_UNSET when reverting to firmware-assigned address If pci_assign_resource() fails to assign space for a BAR, we may restore the BAR to whatever firmware left there at boot-time (this depends on whether the arch implements pcibios_retrieve_fw_addr()). The messages we print are not as useful as they could be: pci 0000:00:01.0: BAR 15: assigned [mem 0xc0000000-0xc01fffff 64bit pref] pci 0000:01:00.0: BAR 0: no space for [mem size 0x10000000 pref] pci 0000:01:00.0: BAR 0: trying firmware assignment [mem size 0x10000000 pref] pci 0000:01:00.0: BAR 0: [mem size 0x10000000 pref] conflicts with PCI Bus 0000:00 [mem 0xc0000000-0xffffffff window] The last two lines should contain the actual BAR address, not the size. Clear IORESOURCE_UNSET so we print the address. If requesting the firmware-assigned resource fails, mark it IORESOURCE_UNSET again. This is a cosmetic change to clarify the message: previously, if pci_revert_fw_address() succeeded, pci_assign_resource() cleared IORESOURCE_UNSET anyway, so this isn't really a functional change. Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491#c50 Signed-off-by: Bjorn Helgaas --- drivers/pci/setup-res.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 232f9254c11a..54c4f4f8105d 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -177,6 +177,7 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, end = res->end; res->start = fw_addr; res->end = res->start + size - 1; + res->flags &= ~IORESOURCE_UNSET; root = pci_find_parent_resource(dev, res); if (!root) { @@ -194,6 +195,7 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, resno, res, conflict->name, conflict); res->start = start; res->end = end; + res->flags |= IORESOURCE_UNSET; return -EBUSY; } return 0; -- 2.20.1