linux/pcifront: claim PCI resources also on rescan

Condensed from the following two patches:

http://git.kernel.org/?p=3Dlinux/kernel/git/konrad/xen.git;a=3Dcommitdiff;h=
=3D621d869f36b215d63bb99e7ecd7a11f029821b85=20
xen-pcifront: Claim PCI resources before going live.

author  Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>=09
        Fri, 18 Jun 2010 19:31:47 +0000 (15:31 -0400)
committer       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>=09
        Fri, 18 Jun 2010 19:40:37 +0000 (15:40 -0400)

We were missing the important step of claiming (and setting the
parent of IO and MEM regions to 'PCI IO' and 'PCI mem' respectivly)
of the BARs. This meant that during hot inserts we would get:

igb 0000:01:00.1: device not available (can't reserve [mem
0xfb840000-0xfb8=
5ffff])

even thought the memory region had been reserved before.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
http://git.kernel.org/?p=3Dlinux/kernel/git/konrad/xen.git;a=3Dcommitdiff;h=
=3D4a65de894fc0af05397eedca180d0ea7d8c6caba=20
xen-pcifront: Don't race with udev when discovering new devices.

author  Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>=09
        Fri, 23 Jul 2010 14:35:57 +0000 (10:35 -0400)
committer       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>=09
        Fri, 23 Jul 2010 15:15:56 +0000 (11:15 -0400)

We inadvertly would call 'pci_bus_add_device' right after discovering
the device, but before claiming the BARs. This ended up firing off
a uevent and udev loading the module and the modules failing to
request_region as they were not claimed. We fix this by holding off
going live by calling 'pci_bus_add_devices' at the end.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Reported-by: Rafal Wojtczuk <rafal@invisiblethingslab.com>

diff --git a/drivers/xen/pcifront/pci_op.c b/drivers/xen/pcifront/pci_op.c
index 2034d208f9929272c401649718d9d6e04165603f..b1fc6b3c5bf687438adc87fdd81b760823a447db 100644 (file)
--- a/drivers/xen/pcifront/pci_op.c
+++ b/drivers/xen/pcifront/pci_op.c
@@ -529,14 +529,18 @@ int __devinit pcifront_rescan_root(struct pcifront_device *pdev,
                }
 
                d = pci_scan_single_device(b, devfn);
-               if (d) {
+               if (d)
                        dev_info(&pdev->xdev->dev, "New device on "
                                 "%04x:%02x:%02x.%02x found.\n", domain, bus,
                                 PCI_SLOT(devfn), PCI_FUNC(devfn));
-                       pci_bus_add_device(d);
-               }
        }
 
+       /* Claim resources before going "live" with our devices */
+       pci_walk_bus(b, pcifront_claim_resource, pdev);
+
+       /* Create SysFS and notify udev of the devices. Aka: "going live" */
+       pci_bus_add_devices(b);
+
        return 0;
 }