PCI: hv: Handle vmbus_sendpacket() failure in hv_compose_msi_msg()

Handle vmbus_sendpacket() failure in hv_compose_msi_msg().

I happened to find this when reading the code.  I didn't get a real issue
however.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: KY Srinivasan <kys@microsoft.com>
CC: Jake Oshins <jakeo@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Vitaly Kuznetsov <vkuznets@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index 3034d48edbe1..e9307afa003d 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -895,8 +895,10 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
                                sizeof(*int_pkt), (unsigned long)&ctxt.pkt,
                                VM_PKT_DATA_INBAND,
                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-        if (!ret)
-                wait_for_completion(&comp.comp_pkt.host_event);
+        if (ret)
+                goto free_int_desc;
+
+        wait_for_completion(&comp.comp_pkt.host_event);
 
         if (comp.comp_pkt.completion_status < 0) {
                 dev_err(&hbus->hdev->device,