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Re: [libvirt] [PATCH] qemu: Don't delete USB device on failed qemuPrepareHostdevUSBDevices



On 05/17/2012 08:34 PM, Michal Privoznik wrote:
If qemuPrepareHostdevUSBDevices fail it will roll back devices added
to the driver list of used devices. However, if it may fail because
the device is being used already. But then again - with roll back.
Therefore don't try to remove a usb device manually if the function
fail. Although, we want to remove the device if any operation
performed afterwards fail.
---
  src/qemu/qemu_hotplug.c |    4 +++-
  1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 9b60816..dfca7e2 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1173,8 +1173,10 @@ int qemuDomainAttachHostDevice(struct qemud_driver *driver,
              goto cleanup;
          }

-        if (qemuPrepareHostdevUSBDevices(driver, vm->def->name, list)<  0)
+        if (qemuPrepareHostdevUSBDevices(driver, vm->def->name, list)<  0) {
+            usb = NULL;
              goto cleanup;
+        }

          usbDeviceListSteal(list, usb);
      }

   I wrote the original code, so I give my ACK here.

   Guannan Ren


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