linux/arch/frv/mb93090-mb00
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
..
Makefile frv: switch to GENERIC_PCI_IOMAP 2011-12-04 16:00:12 +02:00
flash.c FRV: Flash mappings for the MB93090-MB00 motherboard 2009-09-24 17:18:38 -07:00
pci-dma-nommu.c FRV: Add missing linux/export.h #inclusions 2012-11-02 13:20:42 +00:00
pci-dma.c frv: remove the second parameter of kmap_atomic_primary() 2012-07-23 14:11:22 +08:00
pci-frv.c frv/PCI: Clip bridge windows to fit in upstream windows 2015-01-16 10:04:42 -06:00
pci-frv.h frv/PCI: Remove pcibios_last_bus 2013-10-29 16:55:58 -06:00
pci-irq.c PCI: Turn pcibios_penalize_isa_irq() into a weak function 2014-05-27 16:23:58 -06:00
pci-vdk.c PCI: Assign resources before drivers claim devices (pci_scan_root_bus()) 2015-03-19 10:17:13 -05:00