4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> commit 4d8c8bd6f2062c9988817183a91fe2e623c8aa5e upstream. Occasionaly PV guests would crash with: pciback 0000:00:00.1: Xen PCI mapped GSI0 to IRQ16 BUG: unable to handle kernel paging request at 0000000d1a8c0be0 .. snip.. <ffffffff8139ce1b>] find_next_bit+0xb/0x10 [<ffffffff81387f22>] cpumask_next_and+0x22/0x40 [<ffffffff813c1ef8>] pci_device_probe+0xb8/0x120 [<ffffffff81529097>] ? driver_sysfs_add+0x77/0xa0 [<ffffffff815293e4>] driver_probe_device+0x1a4/0x2d0 [<ffffffff813c1ddd>] ? pci_match_device+0xdd/0x110 [<ffffffff81529657>] __device_attach_driver+0xa7/0xb0 [<ffffffff815295b0>] ? __driver_attach+0xa0/0xa0 [<ffffffff81527622>] bus_for_each_drv+0x62/0x90 [<ffffffff8152978d>] __device_attach+0xbd/0x110 [<ffffffff815297fb>] device_attach+0xb/0x10 [<ffffffff813b75ac>] pci_bus_add_device+0x3c/0x70 [<ffffffff813b7618>] pci_bus_add_devices+0x38/0x80 [<ffffffff813dc34e>] pcifront_scan_root+0x13e/0x1a0 [<ffffffff817a0692>] pcifront_backend_changed+0x262/0x60b [<ffffffff814644c6>] ? xenbus_gather+0xd6/0x160 [<ffffffff8120900f>] ? put_object+0x2f/0x50 [<ffffffff81465c1d>] xenbus_otherend_changed+0x9d/0xa0 [<ffffffff814678ee>] backend_changed+0xe/0x10 [<ffffffff81463a28>] xenwatch_thread+0xc8/0x190 [<ffffffff810f22f0>] ? woken_wake_function+0x10/0x10 which was the result of two things: When we call pci_scan_root_bus we would pass in 'sd' (sysdata) pointer which was an 'pcifront_sd' structure. However in the pci_device_add it expects that the 'sd' is 'struct sysdata' and sets the dev->node to what is in sd->node (offset 4): set_dev_node(&dev->dev, pcibus_to_node(bus)); __pcibus_to_node(const struct pci_bus *bus) { const struct pci_sysdata *sd = bus->sysdata; return sd->node; } However our structure was pcifront_sd which had nothing at that offset: struct pcifront_sd { int domain; /* 0 4 */ /* XXX 4 bytes hole, try to pack */ struct pcifront_device * pdev; /* 8 8 */ } That is an hole - filled with garbage as we used kmalloc instead of kzalloc (the second problem). This patch fixes the issue by: 1) Use kzalloc to initialize to a well known state. 2) Put 'struct pci_sysdata' at the start of 'pcifront_sd'. That way access to the 'node' will access the right offset. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/pci/xen-pcifront.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/drivers/pci/xen-pcifront.c +++ b/drivers/pci/xen-pcifront.c @@ -53,7 +53,7 @@ struct pcifront_device { }; struct pcifront_sd { - int domain; + struct pci_sysdata sd; struct pcifront_device *pdev; }; @@ -67,7 +67,9 @@ static inline void pcifront_init_sd(stru unsigned int domain, unsigned int bus, struct pcifront_device *pdev) { - sd->domain = domain; + /* Because we do not expose that information via XenBus. */ + sd->sd.node = first_online_node; + sd->sd.domain = domain; sd->pdev = pdev; } @@ -468,8 +470,8 @@ static int pcifront_scan_root(struct pci dev_info(&pdev->xdev->dev, "Creating PCI Frontend Bus %04x:%02x\n", domain, bus); - bus_entry = kmalloc(sizeof(*bus_entry), GFP_KERNEL); - sd = kmalloc(sizeof(*sd), GFP_KERNEL); + bus_entry = kzalloc(sizeof(*bus_entry), GFP_KERNEL); + sd = kzalloc(sizeof(*sd), GFP_KERNEL); if (!bus_entry || !sd) { err = -ENOMEM; goto err_out; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html