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MSI: Robust resource release

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msi_init may fail, so we need to check on uninit if the cap was
actually installed. This also avoids that the users need to check.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jan Kiszka 2011-05-02 20:00:47 +02:00 • committed by Michael S. Tsirkin
parent 072476ea08
commit 45fe15c25a
3 changed files with 12 additions and 9 deletions
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12
hw/msi.c
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@ -164,9 +164,17 @@ int msi_init(struct PCIDevice *dev, uint8_t offset,
void msi_uninit(struct PCIDevice *dev)
{
uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
uint8_t cap_size = msi_cap_sizeof(flags);
uint16_t flags;
uint8_t cap_size;
if (!(dev->cap_present & QEMU_PCI_CAP_MSI)) {
return;
}
flags = pci_get_word(dev->config + msi_flags_off(dev));
cap_size = msi_cap_sizeof(flags);
pci_del_capability(dev, PCI_CAP_ID_MSIX, cap_size);
dev->cap_present &= ~QEMU_PCI_CAP_MSI;
MSI_DEV_PRINTF(dev, "uninit\n");
}