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pci: cleanly backout of pci_qdev_init() 

If the init function of a device fails, as might happen with device
assignment, we never undo the work done by do_pci_register_device().
This not only causes a bit of a memory leak, but also leaves a bogus
pointer in the bus devices array that can cause a segfault or
garbage data from 'info pci'.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2010-05-11 06:44:21 -04:00 committed by Michael S. Tsirkin
parent 54d7cf136f
commit 925fe64ae7
1 changed files with 11 additions and 5 deletions
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16
hw/pci.c
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@ -625,6 +625,13 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
return pci_dev;
}
static void do_pci_unregister_device(PCIDevice *pci_dev)
{
qemu_free_irqs(pci_dev->irq);
pci_dev->bus->devices[pci_dev->devfn] = NULL;
pci_config_free(pci_dev);
}
PCIDevice *pci_register_device(PCIBus *bus, const char *name,
int instance_size, int devfn,
PCIConfigReadFunc *config_read,
@ -680,10 +687,7 @@ static int pci_unregister_device(DeviceState *dev)
return ret;
pci_unregister_io_regions(pci_dev);
qemu_free_irqs(pci_dev->irq);
pci_dev->bus->devices[pci_dev->devfn] = NULL;
pci_config_free(pci_dev);
do_pci_unregister_device(pci_dev);
return 0;
}
@ -1652,8 +1656,10 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
if (pci_dev == NULL)
return -1;
rc = info->init(pci_dev);
if (rc != 0)
if (rc != 0) {
do_pci_unregister_device(pci_dev);
return rc;
}
/* rom loading */
if (pci_dev->romfile == NULL && info->romfile != NULL)