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Simplify fu_device_list_wait_for_replug() for sanity

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Rather than using a recursive GMainLoop, just run a single iteration of the
mainloop every 1ms while we're waiting.

This simplifies the device lifecycle dramatically as we don't have to worry
about reentrant removals. It's also a lot simpler to debug as we know the only
way to return is the timeout elapsing or FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG being
unset.

If multiple devices got removed and we're waiting for one to re-appear, also
wait for all devices to come back before returning to the main loop.

In the worst case, this causes the device list to wait the full removal_delay
for the device rather than returning when the first device matches. This allows
us to simplify the hub update when we reboot the entire device and various
devices from different plugins come back in an unpredictable order.

Fixes the other half of https://github.com/fwupd/fwupd/issues/2376
This commit is contained in:
Richard Hughes 2020-10-16 16:54:15 +01:00
parent ae5858ff58
commit f2a3e01f96
2 changed files with 35 additions and 50 deletions
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80
src/fu-device-list.c
View File

@ -38,8 +38,6 @@ struct _FuDeviceList
GObject parent_instance;
GPtrArray *devices; /* of FuDeviceItem */
GRWLock devices_mutex;
GMainLoop *replug_loop; /* block waiting for replug */
guint replug_id; /* timeout the loop */
};
enum {
@ -567,15 +565,6 @@ fu_device_list_item_set_device (FuDeviceItem *item, FuDevice *device)
g_set_object (&item->device, device);
}
static gboolean
fu_device_list_replug_loop_quit_cb (gpointer user_data)
{
FuDeviceList *self = FU_DEVICE_LIST (user_data);
g_debug ("quitting replug loop");
g_main_loop_quit (self->replug_loop);
return G_SOURCE_REMOVE;
}
static void
fu_device_list_replace (FuDeviceList *self, FuDeviceItem *item, FuDevice *device)
{
@ -651,11 +640,9 @@ fu_device_list_replace (FuDeviceList *self, FuDeviceItem *item, FuDevice *device
fu_device_list_emit_device_changed (self, device);
/* we were waiting for this... */
if (fu_device_has_flag (item->device_old, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG) &&
g_main_loop_is_running (self->replug_loop)) {
g_debug ("schedule quit replug loop in idle");
if (fu_device_has_flag (item->device_old, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG)) {
g_debug ("device came back, clearing flag");
fu_device_remove_flag (item->device_old, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG);
g_idle_add (fu_device_list_replug_loop_quit_cb, self);
}
}
@ -691,20 +678,13 @@ fu_device_list_add (FuDeviceList *self, FuDevice *device)
/* is the device waiting to be replugged? */
item = fu_device_list_find_by_id (self, fu_device_get_id (device), NULL);
if (item != NULL && item->remove_id != 0) {
if (item != NULL) {
g_debug ("found existing device %s, reusing item",
fu_device_get_id (item->device));
fu_device_list_replace (self, item, device);
return;
}
/* verify the device does not already exist */
if (item != NULL) {
g_debug ("device %s already exists, ignoring",
fu_device_get_id (item->device));
return;
}
/* verify a device with same connection does not already exist */
item = fu_device_list_find_by_connection (self,
fu_device_get_physical_id (device),
@ -818,18 +798,19 @@ fu_device_list_get_by_guid (FuDeviceList *self, const gchar *guid, GError **erro
return NULL;
}
static gboolean
fu_device_list_replug_cb (gpointer user_data)
/* count devices that are disconnected and are waiting to be replugged */
static guint
fu_device_list_devices_wait_removed (FuDeviceList *self)
{
FuDeviceList *self = FU_DEVICE_LIST (user_data);
/* no longer valid */
self->replug_id = 0;
/* quit loop */
g_debug ("device did not replug");
g_main_loop_quit (self->replug_loop);
return FALSE;
guint cnt = 0;
g_rw_lock_reader_lock (&self->devices_mutex);
for (guint i = 0; i < self->devices->len; i++) {
FuDeviceItem *item = g_ptr_array_index (self->devices, i);
if (item->remove_id != 0)
cnt++;
}
g_rw_lock_reader_unlock (&self->devices_mutex);
return cnt;
}
/**
@ -852,11 +833,13 @@ fu_device_list_wait_for_replug (FuDeviceList *self, FuDevice *device, GError **e
{
FuDeviceItem *item;
guint remove_delay;
guint wait_removed;
guint wait_removed_old = 0;
g_autoptr(GTimer) timer = g_timer_new ();
g_return_val_if_fail (FU_IS_DEVICE_LIST (self), FALSE);
g_return_val_if_fail (FU_IS_DEVICE (device), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_return_val_if_fail (self->replug_id == 0, FALSE);
/* not found */
item = fu_device_list_find_by_device (self, device);
@ -895,14 +878,20 @@ fu_device_list_wait_for_replug (FuDeviceList *self, FuDevice *device, GError **e
}
/* time to unplug and then re-plug */
self->replug_id = g_timeout_add (remove_delay, fu_device_list_replug_cb, self);
g_main_loop_run (self->replug_loop);
/* cancel timeout if still pending */
if (self->replug_id != 0) {
g_source_remove (self->replug_id);
self->replug_id = 0;
}
do {
/* count how many devices are in the remove waiting state */
wait_removed = fu_device_list_devices_wait_removed (self);
if (wait_removed != wait_removed_old) {
g_debug ("devices in wait_removed: %u -> %u",
wait_removed_old, wait_removed);
wait_removed_old = wait_removed;
}
g_usleep (1000);
g_main_context_iteration (NULL, FALSE);
if (!fu_device_has_flag (item->device, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG) &&
wait_removed == 0)
break;
} while (g_timer_elapsed (timer, NULL) * 1000.f < remove_delay);
/* device was not added back to the device list */
if (fu_device_has_flag (item->device, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG)) {
@ -1016,7 +1005,6 @@ static void
fu_device_list_init (FuDeviceList *self)
{
self->devices = g_ptr_array_new_with_free_func ((GDestroyNotify) fu_device_list_item_free);
self->replug_loop = g_main_loop_new (NULL, FALSE);
g_rw_lock_init (&self->devices_mutex);
}
@ -1026,11 +1014,7 @@ fu_device_list_finalize (GObject *obj)
FuDeviceList *self = FU_DEVICE_LIST (obj);
g_rw_lock_clear (&self->devices_mutex);
if (self->replug_id != 0)
g_source_remove (self->replug_id);
g_ptr_array_unref (self->devices);
g_main_loop_unref (self->replug_loop);
G_OBJECT_CLASS (fu_device_list_parent_class)->finalize (obj);
}

5
src/fu-self-test.c
View File

@ -1975,14 +1975,15 @@ fu_device_list_delay_func (gconstpointer user_data)
fu_device_list_add (device_list, device1);
g_assert_cmpint (added_cnt, ==, 1);
g_assert_cmpint (removed_cnt, ==, 0);
g_assert_cmpint (changed_cnt, ==, 0);
g_assert_cmpint (changed_cnt, ==, 1);
/* add a device with the same ID */
fu_device_set_id (device2, "device1");
fu_device_list_add (device_list, device2);
fu_device_set_remove_delay (device2, 100);
g_assert_cmpint (added_cnt, ==, 1);
g_assert_cmpint (removed_cnt, ==, 0);
g_assert_cmpint (changed_cnt, ==, 0);
g_assert_cmpint (changed_cnt, ==, 2);
/* spin a bit */
fu_test_loop_run_with_timeout (10);