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PCI: hv: Add hv_pci_remove_slots() when we unload the driver

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When we unload the pci-hyperv host controller driver, the host does not
send us a PCI_EJECT message.

In this case we also need to make sure the sysfs PCI slot directory is
removed, otherwise a command on a slot file eg:

"cat /sys/bus/pci/slots/2/address"

will trigger a

"BUG: unable to handle kernel paging request"

and, if we unload/reload the driver several times we would end up with
stale slot entries in PCI slot directories in /sys/bus/pci/slots/

root@localhost:~# ls -rtl  /sys/bus/pci/slots/
total 0
drwxr-xr-x 2 root root 0 Feb  7 10:49 2
drwxr-xr-x 2 root root 0 Feb  7 10:49 2-1
drwxr-xr-x 2 root root 0 Feb  7 10:51 2-2

Add the missing code to remove the PCI slot and fix the current
behaviour.

Fixes: a15f2c08c7 ("PCI: hv: support reporting serial number as slot information")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
[lorenzo.pieralisi@arm.com: reformatted the log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Dexuan Cui 2019-03-04 21:34:48 +00:00 committed by Lorenzo Pieralisi
parent 05f151a73e
commit 15becc2b56
1 changed files with 16 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/pci/controller/pci-hyperv.c
View file

@ -1486,6 +1486,21 @@ static void hv_pci_assign_slots(struct hv_pcibus_device *hbus)
}
}
/*
* Remove entries in sysfs pci slot directory.
*/
static void hv_pci_remove_slots(struct hv_pcibus_device *hbus)
{
struct hv_pci_dev *hpdev;
list_for_each_entry(hpdev, &hbus->children, list_entry) {
if (!hpdev->pci_slot)
continue;
pci_destroy_slot(hpdev->pci_slot);
hpdev->pci_slot = NULL;
}
}
/**
* create_root_hv_pci_bus() - Expose a new root PCI bus
* @hbus: Root PCI bus, as understood by this driver
@ -2680,6 +2695,7 @@ static int hv_pci_remove(struct hv_device *hdev)
pci_lock_rescan_remove();
pci_stop_root_bus(hbus->pci_bus);
pci_remove_root_bus(hbus->pci_bus);
hv_pci_remove_slots(hbus);
pci_unlock_rescan_remove();
hbus->state = hv_pcibus_removed;
}