WSL2-Linux-Kernel/arch/xtensa
Yijing Wang b97ea289cf PCI: Assign resources before drivers claim devices (pci_scan_root_bus())
Previously, pci_scan_root_bus() created a root PCI bus, enumerated the
devices on it, and called pci_bus_add_devices(), which made the devices
available for drivers to claim them.

Most callers assigned resources to devices after pci_scan_root_bus()
returns, which may be after drivers have claimed the devices.  This is
incorrect; the PCI core should not change device resources while a driver
is managing the device.

Remove pci_bus_add_devices() from pci_scan_root_bus() and do it after any
resource assignment in the callers.

Note that ARM's pci_common_init_dev() already called pci_bus_add_devices()
after pci_scan_root_bus(), so we only need to remove the first call:

  pci_common_init_dev
    pcibios_init_hw
      pci_scan_root_bus
        pci_bus_add_devices        # first call
    pci_bus_assign_resources
    pci_bus_add_devices            # second call

[bhelgaas: changelog, drop "root_bus" var in alpha common_init_pci(),
return failure earlier in mn10300, add "return" in x86 pcibios_scan_root(),
return early if xtensa platform_pcibios_fixup() fails]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Richard Henderson <rth@twiddle.net>
CC: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
CC: Matt Turner <mattst88@gmail.com>
CC: David Howells <dhowells@redhat.com>
CC: Tony Luck <tony.luck@intel.com>
CC: Michal Simek <monstr@monstr.eu>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
CC: Sebastian Ott <sebott@linux.vnet.ibm.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Chris Metcalf <cmetcalf@ezchip.com>
CC: Chris Zankel <chris@zankel.net>
CC: Max Filippov <jcmvbkbc@gmail.com>
CC: Thomas Gleixner <tglx@linutronix.de>
2015-03-19 10:17:13 -05:00
..
boot xtensa: nommu: fix uImage load address 2014-10-21 13:28:54 +04:00
configs xtensa: disable link optimization 2014-12-15 23:47:24 -08:00
include asm-generic: uaccess.h cleanup 2015-02-18 10:02:24 -08:00
kernel PCI: Assign resources before drivers claim devices (pci_scan_root_bus()) 2015-03-19 10:17:13 -05:00
lib xtensa: clean up files to make them code-style compliant 2012-12-18 21:10:25 -08:00
mm vm: add VM_FAULT_SIGSEGV handling support 2015-01-29 10:51:32 -08:00
oprofile xtensa: fix oprofile building as module 2013-05-09 01:07:09 -07:00
platforms xtensa: remove s6000 variant and s6105 platform 2014-10-21 13:29:01 +04:00
variants xtensa: remove s6000 variant and s6105 platform 2014-10-21 13:29:01 +04:00
Kconfig Xtensa improvements for 3.19: 2014-12-15 20:10:39 -08:00
Kconfig.debug xtensa: disable link optimization 2014-12-15 23:47:24 -08:00
Makefile xtensa: remove s6000 variant and s6105 platform 2014-10-21 13:29:01 +04:00