nodedev: udev: Hook up virFileWaitForExist to address uevent race of pci device

Similarly to commit 1af45804 we should be safer by waiting for the whole
sysfs tree is created for the device.

Signed-off-by: Guoyi Tu <tugy@chinatelecom.cn>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index 94e8626aee1706a97156c2476575146fafc2642d..7b4ff80f8fb49b1292f5a4c1d7d17fe4ffdc0cc2 100644 (file)
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -427,10 +427,19 @@ udevProcessPCI(virNodeDeviceDriverState *driver_state,
     virPCIEDeviceInfo *pci_express = NULL;
     virPCIDevice *pciDev = NULL;
     virPCIDeviceAddress devAddr = { 0 };
+    g_autofree char *linkpath = NULL;
     int ret = -1;
     char *p;
     bool privileged = false;
 
+    linkpath = g_strdup_printf("%s/config", udev_device_get_syspath(device));
+    if (virFileWaitForExists(linkpath, 10, 100) < 0) {
+        virReportSystemError(errno,
+                             _("failed to wait for file '%1$s' to appear"),
+                             linkpath);
+        goto cleanup;
+    }
+
     VIR_WITH_MUTEX_LOCK_GUARD(&driver_state->lock) {
         privileged = driver_state->privileged;
     }