xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: Add device disconnected state

Browse Source 
Add a new state to pci_dev to be set when it is unexpectedly disconnected.
The PCI driver tear down functions can observe this new device state so
they may skip operations that will fail.

The pciehp and pcie-dpc drivers are aware when the link is down, so these
set the flag when their handlers detect the device is disconnected.

Tested-by: Krishna Dhulipala <krishnad@fb.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Wei Zhang <wzhang@fb.com>
This commit is contained in:
Keith Busch
2017-03-29 22:48:59 -05:00
committed by Bjorn Helgaas
parent d3881e5015
commit 89ee9f7680
4 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/pci/hotplug/pciehp_pci.c
View File

@@ -109,6 +109,12 @@ int pciehp_unconfigure_device(struct slot *p_slot)
break;
}
}
if (!presence) {
pci_dev_set_disconnected(dev, NULL);
if (pci_has_subordinate(dev))
pci_walk_bus(dev->subordinate,
pci_dev_set_disconnected, NULL);
}
pci_stop_and_remove_bus_device(dev);
/*
* Ensure that no new Requests will be generated from