target/linux/ramips/patches-5.15/106-PCI-Let-pcibios_root_bridge_prepare-access-bridge-wi.patch

   1 From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
   2 Date: Tue, 7 Dec 2021 11:49:20 +0100
   3 Subject: [PATCH] PCI: Let pcibios_root_bridge_prepare() access bridge->windows
   4
   5 When pci_register_host_bridge() is called, bridge->windows are already
   6 available. However these windows are being moved temporarily from there.
   7
   8 To let pcibios_root_bridge_prepare() have access to these windows, move the
   9 windows movement after calling this function. This is useful for the MIPS
  10 ralink mt7621 platform so it can set up I/O coherence units and avoid
  11 custom MIPS code in the mt7621 PCIe controller driver.
  12
  13 Link: https://lore.kernel.org/r/20211207104924.21327-2-sergio.paracuellos@gmail.com
  14 Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
  15 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  16 Acked-by: Arnd Bergmann <arnd@arndb.de>
  17 ---
  18
  19 --- a/drivers/pci/probe.c
  20 +++ b/drivers/pci/probe.c
  21 @@ -898,8 +898,6 @@ static int pci_register_host_bridge(stru
  22
  23         bridge->bus = bus;
  24
  25 -       /* Temporarily move resources off the list */
  26 -       list_splice_init(&bridge->windows, &resources);
  27         bus->sysdata = bridge->sysdata;
  28         bus->ops = bridge->ops;
  29         bus->number = bus->busn_res.start = bridge->busnr;
  30 @@ -925,6 +923,8 @@ static int pci_register_host_bridge(stru
  31         if (err)
  32                 goto free;
  33
  34 +       /* Temporarily move resources off the list */
  35 +       list_splice_init(&bridge->windows, &resources);
  36         err = device_add(&bridge->dev);
  37         if (err) {
  38                 put_device(&bridge->dev);