target/linux/generic/backport-5.10/840-0001-PCI-of-Don-t-fail-devm_pci_alloc_host_bridge-on-miss.patch

   1 From: Rob Herring <robh@kernel.org>
   2 Date: Tue, 3 Aug 2021 15:56:55 -0600
   3 Subject: [PATCH] PCI: of: Don't fail devm_pci_alloc_host_bridge() on missing
   4  'ranges'
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Commit 669cbc708122 ("PCI: Move DT resource setup into
  10 devm_pci_alloc_host_bridge()") made devm_pci_alloc_host_bridge() fail on
  11 any DT resource parsing errors, but Broadcom iProc uses
  12 devm_pci_alloc_host_bridge() on BCMA bus devices that don't have DT
  13 resources. In particular, there is no 'ranges' property. Fix iProc by
  14 making 'ranges' optional.
  15
  16 If 'ranges' is required by a platform, there's going to be more errors
  17 latter on if it is missing.
  18
  19 Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
  20 Reported-by: Rafał Miłecki <zajec5@gmail.com>
  21 Cc: Srinath Mannam <srinath.mannam@broadcom.com>
  22 Cc: Roman Bacik <roman.bacik@broadcom.com>
  23 Cc: Bharat Gooty <bharat.gooty@broadcom.com>
  24 Cc: Abhishek Shah <abhishek.shah@broadcom.com>
  25 Cc: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
  26 Cc: Ray Jui <ray.jui@broadcom.com>
  27 Cc: Florian Fainelli <f.fainelli@gmail.com>
  28 Cc: BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>
  29 Cc: Scott Branden <sbranden@broadcom.com>
  30 Cc: Bjorn Helgaas <bhelgaas@google.com>
  31 Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
  32 Signed-off-by: Rob Herring <robh@kernel.org>
  33 Acked-by: Bjorn Helgaas <bhelgaas@google.com>
  34 ---
  35  drivers/pci/of.c | 2 +-
  36  1 file changed, 1 insertion(+), 1 deletion(-)
  37
  38 --- a/drivers/pci/of.c
  39 +++ b/drivers/pci/of.c
  40 @@ -295,7 +295,7 @@ static int devm_of_pci_get_host_bridge_r
  41         /* Check for ranges property */
  42         err = of_pci_range_parser_init(&parser, dev_node);
  43         if (err)
  44 -               goto failed;
  45 +               return 0;
  46
  47         dev_dbg(dev, "Parsing ranges property...\n");
  48         for_each_of_pci_range(&parser, &range) {