diff options
| author | Dexuan Cui <decui@microsoft.com> | 2019-05-15 15:59:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-21 18:50:12 +0200 |
| commit | aa4ba0014eb46b7e3757cf7415d26dbf2b8adc4c (patch) | |
| tree | bd030bb915bfb14aca8c441b93ef178e8d2f0833 /drivers/pci | |
| parent | e4521a041c5857619a589abe19de1165bcafaef8 (diff) | |
PCI: hv: Add hv_pci_remove_slots() when we unload the driver
[ Upstream commit 15becc2b56c6eda3d9bf5ae993bafd5661c1fad1 ]
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: a15f2c08c708 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pci-hyperv.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index 292450c7da62..a5825bbcded7 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -1513,6 +1513,21 @@ 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 @@ -2719,6 +2734,7 @@ 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; } |