如何解决pci_rescan_bus不会在Linux中重新扫描PCI总线
我正在尝试借助pci_rescan_bus()
内核功能在自己的内核驱动程序中重新扫描PCI总线,但是我看不到它的功能。
如果我尝试通过运行以下命令从用户空间执行相同操作,则会看到重新扫描:
echo 1 > /sys/devices/pci0000:00/0000:00:14.1/rescan
我正在尝试重新初始化位于PCI总线上的以太网端口。下面是我现在使用的代码:
struct pci_dev *pci_eth_dev01,*pci_eth_dev02 = NULL;
pci_eth_dev01 = pci_get_device(0x10ec,0x8168,NULL);
if (pci_eth_dev01 != NULL)
dev_info(&info->client->dev,"class - %2X\tbus number - %d\n",pci_eth_dev01->class,pci_eth_dev01->bus->number);
else
dev_info(&info->client->dev,"Error retreiving pci device\n");
pci_eth_dev02 = pci_get_device(0x10ec,pci_eth_dev01);
if (pci_eth_dev02 != NULL)
dev_info(&info->client->dev,pci_eth_dev02->class,pci_eth_dev02->bus->number);
else
dev_info(&info->client->dev,"Error retreiving pci device\n");
pci_stop_and_remove_bus_device(pci_eth_dev02);
pci_remove_bus(pci_eth_dev02->bus);
unsigned int ret = 0;
pci_lock_rescan_remove();
ret = pci_rescan_bus(pci_eth_dev02->bus);
pci_unlock_rescan_remove();
dev_info(&info->client->dev,"ret from pci_rescan_bus - %d\n",ret);
我从2
函数调用中获得了pci_rescan_bus()
作为返回值。
我在这里做错什么了吗?
解决方法
发现pci_rescan_bus(pci_eth_dev02->bus->parent)
是正确的选择,而不是pci_rescan_bus(pci_eth_dev02->bus)
,这是我当前的实现方式,只需稍加修改即可,
static bool re_initialize_eth_ports(struct supercap_info *info)
{
struct pci_dev *pci_eth_dev01 = NULL;
struct pci_dev *pci_eth_dev02 = NULL;
// Get PCI device structures since ethernet ports sit on PCI bus.
pci_eth_dev01 = pci_get_device(REALTEK_ETH_VENDOR_ID,REALTEK_ETH_DEVICE_ID,NULL);
pci_eth_dev02 = pci_get_device(REALTEK_ETH_VENDOR_ID,pci_eth_dev01);
if (!pci_eth_dev01 || !pci_eth_dev02) {
dev_err(&info->client->dev,"Error retrieving PCI device structure\n");
return false;
}
dev_dbg(&info->client->dev,"Device Class - 0x%X\tPCI Bus Number - %d\n",pci_eth_dev01->class,pci_eth_dev01->bus->number);
dev_dbg(&info->client->dev,pci_eth_dev02->class,pci_eth_dev02->bus->number);
// Remove PCI bus devices from the device lists.
pci_stop_and_remove_bus_device_locked(pci_eth_dev01);
pci_stop_and_remove_bus_device_locked(pci_eth_dev02);
// Acquire a mutex lock before re-scanning PCI buses.
pci_lock_rescan_remove();
// Re-scan PCI parent buses for devices.
pci_rescan_bus(pci_eth_dev01->bus->parent);
pci_rescan_bus(pci_eth_dev02->bus->parent);
// Release a mutex lock.
pci_unlock_rescan_remove();
return true;
}
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