Re: [Qemu-devel] [PATCH v8 15/17] vmw_pvscsi: remove unnecessary internal msi state flag

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jun 10, 2016 at 05:54:36PM +0800, Cao jin wrote:
> Internal flag msi_used is uncesessary, msi_uninit() could be called
> directly, msi_enabled() is enough to check device msi state.
> 
> cc: Paolo Bonzini <pbonzini@redhat.com>
> cc: Dmitry Fleytman <dmitry@daynix.com>
> cc: Markus Armbruster <armbru@redhat.com>
> cc: Marcel Apfelbaum <marcel@redhat.com>
> cc: Michael S. Tsirkin <mst@redhat.com>
> 
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
> ---
>  hw/scsi/vmw_pvscsi.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
> index ecd6077..363a7ed 100644
> --- a/hw/scsi/vmw_pvscsi.c
> +++ b/hw/scsi/vmw_pvscsi.c
> @@ -121,8 +121,6 @@ typedef struct {
>      uint8_t msg_ring_info_valid;         /* Whether message ring initialized */
>      uint8_t use_msg;                     /* Whether to use message ring      */
>  
> -    uint8_t msi_used;    /* Whether MSI support was installed successfully   */
> -
>      PVSCSIRingInfo rings;                /* Data transfer rings manager      */
>      uint32_t resetting;                  /* Reset in progress                */
>  
> @@ -362,7 +360,7 @@ pvscsi_update_irq_status(PVSCSIState *s)
>      trace_pvscsi_update_irq_level(should_raise, s->reg_interrupt_enabled,
>                                    s->reg_interrupt_status);
>  
> -    if (s->msi_used && msi_enabled(d)) {
> +    if (msi_enabled(d)) {
>          if (should_raise) {
>              trace_pvscsi_update_irq_msi();
>              msi_notify(d, PVSCSI_VECTOR_COMPLETION);
> @@ -1066,9 +1064,6 @@ pvscsi_init_msi(PVSCSIState *s)
>                     PVSCSI_USE_64BIT, PVSCSI_PER_VECTOR_MASK, NULL);
>      if (res < 0) {
>          trace_pvscsi_init_msi_fail(res);
> -        s->msi_used = false;
> -    } else {
> -        s->msi_used = true;
>      }
>  }
>  
> @@ -1077,9 +1072,7 @@ pvscsi_cleanup_msi(PVSCSIState *s)
>  {
>      PCIDevice *d = PCI_DEVICE(s);
>  
> -    if (s->msi_used) {
> -        msi_uninit(d);
> -    }
> +    msi_uninit(d);
>  }
>  
>  static const MemoryRegionOps pvscsi_ops = {
> @@ -1222,7 +1215,6 @@ static const VMStateDescription vmstate_pvscsi = {
>          VMSTATE_STRUCT_TEST(parent_obj, PVSCSIState,
>                              pvscsi_vmstate_test_pci_device, 0,
>                              vmstate_pci_device, PCIDevice),
> -        VMSTATE_UINT8(msi_used, PVSCSIState),
>          VMSTATE_UINT32(resetting, PVSCSIState),
>          VMSTATE_UINT64(reg_interrupt_status, PVSCSIState),
>          VMSTATE_UINT64(reg_interrupt_enabled, PVSCSIState),


This change will break cross-version migration, we can't make it.

> -- 
> 2.1.0
> 
>