Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc,virtio,pci: bugfixes

Fixes all over the place.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Thu 01 Apr 2021 17:22:03 BST
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
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* remotes/mst/tags/for_upstream:
  pci: sprinkle assert in PCI pin number
  isa/v582c686: Reinitialize ACPI PM device on reset
  vt82c686.c: don't raise SCI when PCI_INTERRUPT_PIN isn't setup
  acpi/piix4: reinitialize acpi PM device on reset
  virtio-pci: remove explicit initialization of val
  virtio-pci: add check for vdev in virtio_pci_isr_read
  vhost-user-blk: add immediate cleanup on shutdown
  vhost-user-blk: perform immediate cleanup if disconnect on initialization
  vhost-user-blk: use different event handlers on initialization

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 883045a..c1b67cf 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1364,9 +1364,14 @@ static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr,
 {
     VirtIOPCIProxy *proxy = opaque;
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-    uint64_t val = qatomic_xchg(&vdev->isr, 0);
-    pci_irq_deassert(&proxy->pci_dev);
+    uint64_t val;
+
+    if (vdev == NULL) {
+        return 0;
+    }
 
+    val = qatomic_xchg(&vdev->isr, 0);
+    pci_irq_deassert(&proxy->pci_dev);
     return val;
 }
 
@@ -1380,10 +1385,10 @@ static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
 {
     VirtIOPCIProxy *proxy = opaque;
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-    uint64_t val = 0;
+    uint64_t val;
 
     if (vdev == NULL) {
-        return val;
+        return 0;
     }
 
     switch (size) {
@@ -1396,6 +1401,9 @@ static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr,
     case 4:
         val = virtio_config_modern_readl(vdev, addr);
         break;
+    default:
+        val = 0;
+        break;
     }
     return val;
 }