[PATCH 1/3] PCI: hv: use the correct buffer size in new_pcichild_device()

[Dexuan Cui]

We don't really need such a big on-stack buffer.
vmbus_sendpacket() here only uses sizeof(struct pci_child_message).

Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
CC: Jake Oshins <jakeo@xxxxxxxxxxxxx>
Cc: KY Srinivasan <kys@xxxxxxxxxxxxx>
CC: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
CC: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
 drivers/pci/host/pci-hyperv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index 763ff87..93ed64a 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -1271,9 +1271,9 @@ static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
 	struct hv_pci_dev *hpdev;
 	struct pci_child_message *res_req;
 	struct q_res_req_compl comp_pkt;
-	union {
-	struct pci_packet init_packet;
-		u8 buffer[0x100];
+	struct {
+		struct pci_packet init_packet;
+		u8 buffer[sizeof(struct pci_child_message)];
 	} pkt;
 	unsigned long flags;
 	int ret;
-- 
2.7.4