Param checking/correcting code of xchi->numintrs should be placed before
it is used.
Also move some resource-alloc code down, save the strenth to free them
on msi_init's failure.

CC: Gerd Hoffmann <kra...@redhat.com>
CC: Markus Armbruster <arm...@redhat.com>
CC: Marcel Apfelbaum <mar...@redhat.com>
CC: Michael S. Tsirkin <m...@redhat.com>

Reviewed-by: Gerd Hoffmann <kra...@redhat.com>
Signed-off-by: Cao jin <caoj.f...@cn.fujitsu.com>
---
 hw/usb/hcd-xhci.c | 39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 4acf0c6..eb1dca5 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3627,25 +3627,6 @@ static void usb_xhci_realize(struct PCIDevice *dev, 
Error **errp)
     dev->config[PCI_CACHE_LINE_SIZE] = 0x10;
     dev->config[0x60] = 0x30; /* release number */
 
-    usb_xhci_init(xhci);
-
-    if (xhci->msi != ON_OFF_AUTO_OFF) {
-        ret = msi_init(dev, 0x70, xhci->numintrs, true, false, &err);
-        /* Any error other than -ENOTSUP(board's MSI support is broken)
-         * is a programming error */
-        assert(!ret || ret == -ENOTSUP);
-        if (ret && xhci->msi == ON_OFF_AUTO_ON) {
-            /* Can't satisfy user's explicit msi=on request, fail */
-            error_append_hint(&err, "You have to use msi=auto (default) or "
-                    "msi=off with this machine type.\n");
-            error_propagate(errp, err);
-            return;
-        }
-        assert(!err || xhci->msi == ON_OFF_AUTO_AUTO);
-        /* With msi=auto, we fall back to MSI off silently */
-        error_free(err);
-    }
-
     if (xhci->numintrs > MAXINTRS) {
         xhci->numintrs = MAXINTRS;
     }
@@ -3667,7 +3648,22 @@ static void usb_xhci_realize(struct PCIDevice *dev, 
Error **errp)
         xhci->max_pstreams_mask = 0;
     }
 
-    xhci->mfwrap_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, xhci_mfwrap_timer, 
xhci);
+    if (xhci->msi != ON_OFF_AUTO_OFF) {
+        ret = msi_init(dev, 0x70, xhci->numintrs, true, false, &err);
+        /* Any error other than -ENOTSUP(board's MSI support is broken)
+         * is a programming error */
+        assert(!ret || ret == -ENOTSUP);
+        if (ret && xhci->msi == ON_OFF_AUTO_ON) {
+            /* Can't satisfy user's explicit msi=on request, fail */
+            error_append_hint(&err, "You have to use msi=auto (default) or "
+                    "msi=off with this machine type.\n");
+            error_propagate(errp, err);
+            return;
+        }
+        assert(!err || xhci->msi == ON_OFF_AUTO_AUTO);
+        /* With msi=auto, we fall back to MSI off silently */
+        error_free(err);
+    }
 
     memory_region_init(&xhci->mem, OBJECT(xhci), "xhci", LEN_REGS);
     memory_region_init_io(&xhci->mem_cap, OBJECT(xhci), &xhci_cap_ops, xhci,
@@ -3697,6 +3693,9 @@ static void usb_xhci_realize(struct PCIDevice *dev, Error 
**errp)
                      
PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64,
                      &xhci->mem);
 
+    usb_xhci_init(xhci);
+    xhci->mfwrap_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, xhci_mfwrap_timer, 
xhci);
+
     if (pci_bus_is_express(dev->bus) ||
         xhci_get_flag(xhci, XHCI_FLAG_FORCE_PCIE_ENDCAP)) {
         ret = pcie_endpoint_cap_init(dev, 0xa0);
-- 
2.1.0




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