mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 02:34:01 +08:00
6a040ce725
The DDW code uses a eeh_dev struct from the pci_dev. However, this is not set until eeh_add_device_late is called. Since pci_bus_add_devices is called before eeh_add_device_late, the PCI devices are added to the bus, making drivers' probe hooks to be called. These will call set_dma_mask, which will call the DDW code, which will require the eeh_dev struct from pci_dev. This would result in a crash, due to a NULL dereference. Calling eeh_add_device_late after pci_bus_add_devices would make the system BUG, because device files shouldn't be added to devices there were not added to the system. So, a new function is needed to add such files only after pci_bus_add_devices have been called. Cc: stable@vger.kernel.org Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> Acked-by: Gavin Shan <shangw@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
|
|
* <benh@kernel.crashing.org>
|
|
* and Arnd Bergmann, IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/export.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/atomic.h>
|
|
|
|
#include <asm/errno.h>
|
|
#include <asm/topology.h>
|
|
#include <asm/pci-bridge.h>
|
|
#include <asm/ppc-pci.h>
|
|
#include <asm/eeh.h>
|
|
|
|
#ifdef CONFIG_PPC_OF_PLATFORM_PCI
|
|
|
|
/* The probing of PCI controllers from of_platform is currently
|
|
* 64 bits only, mostly due to gratuitous differences between
|
|
* the 32 and 64 bits PCI code on PowerPC and the 32 bits one
|
|
* lacking some bits needed here.
|
|
*/
|
|
|
|
static int of_pci_phb_probe(struct platform_device *dev)
|
|
{
|
|
struct pci_controller *phb;
|
|
|
|
/* Check if we can do that ... */
|
|
if (ppc_md.pci_setup_phb == NULL)
|
|
return -ENODEV;
|
|
|
|
pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);
|
|
|
|
/* Alloc and setup PHB data structure */
|
|
phb = pcibios_alloc_controller(dev->dev.of_node);
|
|
if (!phb)
|
|
return -ENODEV;
|
|
|
|
/* Setup parent in sysfs */
|
|
phb->parent = &dev->dev;
|
|
|
|
/* Setup the PHB using arch provided callback */
|
|
if (ppc_md.pci_setup_phb(phb)) {
|
|
pcibios_free_controller(phb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Process "ranges" property */
|
|
pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
|
|
|
|
/* Init pci_dn data structures */
|
|
pci_devs_phb_init_dynamic(phb);
|
|
|
|
/* Create EEH devices for the PHB */
|
|
eeh_dev_phb_init_dynamic(phb);
|
|
|
|
/* Register devices with EEH */
|
|
if (dev->dev.of_node->child)
|
|
eeh_add_device_tree_early(dev->dev.of_node);
|
|
|
|
/* Scan the bus */
|
|
pcibios_scan_phb(phb);
|
|
if (phb->bus == NULL)
|
|
return -ENXIO;
|
|
|
|
/* Claim resources. This might need some rework as well depending
|
|
* whether we are doing probe-only or not, like assigning unassigned
|
|
* resources etc...
|
|
*/
|
|
pcibios_claim_one_bus(phb->bus);
|
|
|
|
/* Finish EEH setup */
|
|
eeh_add_device_tree_late(phb->bus);
|
|
|
|
/* Add probed PCI devices to the device model */
|
|
pci_bus_add_devices(phb->bus);
|
|
|
|
/* sysfs files should only be added after devices are added */
|
|
eeh_add_sysfs_files(phb->bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id of_pci_phb_ids[] = {
|
|
{ .type = "pci", },
|
|
{ .type = "pcix", },
|
|
{ .type = "pcie", },
|
|
{ .type = "pciex", },
|
|
{ .type = "ht", },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver of_pci_phb_driver = {
|
|
.probe = of_pci_phb_probe,
|
|
.driver = {
|
|
.name = "of-pci",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_pci_phb_ids,
|
|
},
|
|
};
|
|
|
|
static __init int of_pci_phb_init(void)
|
|
{
|
|
return platform_driver_register(&of_pci_phb_driver);
|
|
}
|
|
|
|
device_initcall(of_pci_phb_init);
|
|
|
|
#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
|