Re: [Qemu-devel] [PATCH v2] MSI: Robust resource release

[Michael S. Tsirkin]

On Mon, May 02, 2011 at 08:00:47PM +0200, Jan Kiszka wrote:
> 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 <address@hidden>

Applied, thanks!

> ---
>  hw/ide/ich.c   |    5 +----
>  hw/intel-hda.c |    4 +---
>  hw/msi.c       |   12 ++++++++++--
>  3 files changed, 12 insertions(+), 9 deletions(-)
> 
> v2: Push cap check into msi_uninit (just like msix), remove check from
>     users.
> 
> diff --git a/hw/ide/ich.c b/hw/ide/ich.c
> index a3d475c..8c1ff6c 100644
> --- a/hw/ide/ich.c
> +++ b/hw/ide/ich.c
> @@ -110,10 +110,7 @@ static int pci_ich9_uninit(PCIDevice *dev)
>      struct AHCIPCIState *d;
>      d = DO_UPCAST(struct AHCIPCIState, card, dev);
>  
> -    if (msi_enabled(dev)) {
> -        msi_uninit(dev);
> -    }
> -
> +    msi_uninit(dev);
>      qemu_unregister_reset(ahci_reset, d);
>      ahci_uninit(&d->ahci);
>  
> diff --git a/hw/intel-hda.c b/hw/intel-hda.c
> index b0b1d12..093c4b9 100644
> --- a/hw/intel-hda.c
> +++ b/hw/intel-hda.c
> @@ -1174,9 +1174,7 @@ static int intel_hda_exit(PCIDevice *pci)
>  {
>      IntelHDAState *d = DO_UPCAST(IntelHDAState, pci, pci);
>  
> -    if (d->msi) {
> -        msi_uninit(&d->pci);
> -    }
> +    msi_uninit(&d->pci);
>      cpu_unregister_io_memory(d->mmio_addr);
>      return 0;
>  }
> diff --git a/hw/msi.c b/hw/msi.c
> index 0cbf89f..3141804 100644
> --- a/hw/msi.c
> +++ b/hw/msi.c
> @@ -183,9 +183,17 @@ 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");
>  }
>  
> -- 
> 1.7.1