[RFC PATCH v1 03/15] nodedev: immediate update of active config on udev add

[Marc Hartmayer <mhartmay@xxxxxxxxxxxxx>]

From: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>

When an udev add event occurs the mdev active config data requires an
update via mdevctl as the udev does not contain all config data.
This update needs to occur immediate and to be finished before the
libvirt CREATE event is issued to keep the API usage reliable.

After this change, scheduleMdevctlUpdate call is already called in
`udevAddOneDevice` and can therefore be removed in `udevHandleOneDevice`.

Signed-off-by: Boris Fiuczynski <fiuczy@xxxxxxxxxxxxx>
Signed-off-by: Marc Hartmayer <mhartmay@xxxxxxxxxxxxx>
---
 src/node_device/node_device_udev.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index 6613528d0e37..03ef0c14371a 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -1535,6 +1535,7 @@ udevSetParent(struct udev_device *device,
 static int
 udevAddOneDevice(struct udev_device *device)
 {
+    g_autofree char *sysfs_path = NULL;
     virNodeDeviceDef *def = NULL;
     virNodeDeviceObj *obj = NULL;
     virNodeDeviceDef *objdef;
@@ -1549,6 +1550,9 @@ udevAddOneDevice(struct udev_device *device)
     def = g_new0(virNodeDeviceDef, 1);
 
     def->sysfs_path = g_strdup(udev_device_get_syspath(device));
+    /* Create a copy of sysfs_path so it can be safely accessed, even without
+     * holding the @obj lock during the VIR_WARN(...) call at the end. */
+    sysfs_path = g_strdup(def->sysfs_path);
 
     udevGetStringProperty(device, "DRIVER", &def->driver);
 
@@ -1608,6 +1612,13 @@ udevAddOneDevice(struct udev_device *device)
     if (has_mdev_types)
         scheduleMdevctlUpdate(driver->privateData, false);
 
+    /* The added mdev needs an immediate active config update before
+     * the event is issued to allow sane API usage. */
+    if (is_mdev && (nodeDeviceUpdateMediatedDevices() < 0)) {
+        VIR_WARN("Update of mediated device %s failed",
+                 NULLSTR_EMPTY(sysfs_path));
+    }
+
     ret = 0;
 
  cleanup:
@@ -1758,19 +1769,12 @@ nodeStateCleanup(void)
 static int
 udevHandleOneDevice(struct udev_device *device)
 {
-    virNodeDevCapType dev_cap_type;
     const char *action = udev_device_get_action(device);
 
     VIR_DEBUG("udev action: '%s': %s", action, udev_device_get_syspath(device));
 
-    if (STREQ(action, "add") || STREQ(action, "change")) {
-        int ret = udevAddOneDevice(device);
-        if (ret == 0 &&
-            udevGetDeviceType(device, &dev_cap_type) == 0 &&
-            dev_cap_type == VIR_NODE_DEV_CAP_MDEV)
-            scheduleMdevctlUpdate(driver->privateData, false);
-        return ret;
-    }
+    if (STREQ(action, "add") || STREQ(action, "change"))
+        return udevAddOneDevice(device);
 
     if (STREQ(action, "remove"))
         return udevRemoveOneDevice(device);
-- 
2.34.1
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