diff options
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-03-31 15:47:11 +1100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-04-04 18:32:25 +0300 |
| commit | 193982c6f9424779b53a168fe32ebc30a776cbf1 (patch) | |
| tree | 78d3f3f3cd8bff50a01c3052e45ec5b61b117efe /hw/pci | |
| parent | 87cc4c61020addea6a001b94b662596b1896d1b3 (diff) | |
pci: Only unmap bus_master_enabled_region if was added previously
Normally pci_init_bus_master() would be called either via
bus->machine_done.notify or directly from do_pci_register_device().
However if a device's realize() failed, pci_init_bus_master() is not
called, and do_pci_unregister_device() fails on
memory_region_del_subregion() as it was not mapped.
This adds a check that subregion was mapped before unmapping it.
Fixes: c53598ed18e4 ("pci: Add missing drop of bus master AS reference")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'hw/pci')
| -rw-r--r-- | hw/pci/pci.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c index bd8043c460..259483b1c0 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -869,8 +869,10 @@ static void do_pci_unregister_device(PCIDevice *pci_dev) pci_dev->bus->devices[pci_dev->devfn] = NULL; pci_config_free(pci_dev); - memory_region_del_subregion(&pci_dev->bus_master_container_region, - &pci_dev->bus_master_enable_region); + if (memory_region_is_mapped(&pci_dev->bus_master_enable_region)) { + memory_region_del_subregion(&pci_dev->bus_master_container_region, + &pci_dev->bus_master_enable_region); + } address_space_destroy(&pci_dev->bus_master_as); } |