Without treating events with timeouts specially some drivers would
cause a 30 seconds stall on boot: .
I also received reports of some drivers not working at all, even
after the timeout.
We will remove this patch when more drivers have been fixed in
the kernel (3.4?).
This reverts 43d5c5f03645c4b842659f9b5bd0ae465e885e92 and
57c6f8ae5f52a6e8ffc66a54966346f733dded39.
---
Note: this is mostly a FYI, and whether or not it makes sense
to apply this upstream depends on how big problems other report
regarding this issue.
TODO | 2 ++
src/libudev-device.c | 19 +++++++++++++++++++
src/libudev-private.h | 1 +
src/udevd.c | 13 ++++++++++---
4 files changed, 32 insertions(+), 3 deletions(-)
diff --git a/TODO b/TODO
index 36e8440..c2e59b6 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,8 @@
- find a way to tell udev to not cancel firmware
requests in initramfs
+ - remove TIMEOUT= handling
+
- move /lib/udev/devices/ to tmpfiles
- trigger --subsystem-match=usb/usb_device
diff --git a/src/libudev-device.c b/src/libudev-device.c
index 10f28b8..639c367 100644
--- a/src/libudev-device.c
+++ b/src/libudev-device.c
@@ -68,6 +68,7 @@ struct udev_device {
struct udev_list tags_list;
unsigned long long int seqnum;
unsigned long long int usec_initialized;
+ int timeout;
int devlink_priority;
int refcount;
dev_t devnum;
@@ -160,6 +161,21 @@ static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
return 0;
}
+int udev_device_get_timeout(struct udev_device *udev_device)
+{
+ return udev_device->timeout;
+}
+
+static int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
+{
+ char num[32];
+
+ udev_device->timeout = timeout;
+ snprintf(num, sizeof(num), "%u", timeout);
+ udev_device_add_property(udev_device, "TIMEOUT", num);
+ return 0;
+}
+
const char *udev_device_get_devpath_old(struct udev_device *udev_device)
{
return udev_device->devpath_old;
@@ -414,6 +430,8 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device,
udev_device_set_devpath_old(udev_device, &property[12]);
} else if (strncmp(property, "SEQNUM=", 7) == 0) {
udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
+ } else if (strncmp(property, "TIMEOUT=", 8) == 0) {
+ udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
} else if (strncmp(property, "IFINDEX=", 8) == 0) {
udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
} else if (strncmp(property, "DEVMODE=", 8) == 0) {
@@ -599,6 +617,7 @@ struct udev_device *udev_device_new(struct udev *udev)
udev_list_init(udev, &udev_device->sysattr_value_list, true);
udev_list_init(udev, &udev_device->sysattr_list, false);
udev_list_init(udev, &udev_device->tags_list, true);
+ udev_device->timeout = -1;
udev_device->watch_handle = -1;
/* copy global properties */
udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
diff --git a/src/libudev-private.h b/src/libudev-private.h
index 5f5c64a..ec63b67 100644
--- a/src/libudev-private.h
+++ b/src/libudev-private.h
@@ -87,6 +87,7 @@ const char *udev_device_get_id_filename(struct udev_device *udev_device);
void udev_device_set_is_initialized(struct udev_device *udev_device);
int udev_device_add_tag(struct udev_device *udev_device, const char *tag);
void udev_device_cleanup_tags_list(struct udev_device *udev_device);
+int udev_device_get_timeout(struct udev_device *udev_device);
unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_device);
void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized);
int udev_device_get_devlink_priority(struct udev_device *udev_device);
diff --git a/src/udevd.c b/src/udevd.c
index 1702217..88e9272 100644
--- a/src/udevd.c
+++ b/src/udevd.c
@@ -401,7 +401,7 @@ out:
}
}
-static void event_run(struct event *event)
+static void event_run(struct event *event, bool force)
{
struct udev_list_node *loop;
@@ -427,7 +427,7 @@ static void event_run(struct event *event)
return;
}
- if (children >= children_max) {
+ if (!force && children >= children_max) {
if (children_max > 1)
info(event->udev, "maximum number (%i) of children reached\n", children);
return;
@@ -461,6 +461,13 @@ static int event_queue_insert(struct udev_device *dev)
event->state = EVENT_QUEUED;
udev_list_node_append(&event->node, &event_list);
+
+ /* run all events with a timeout set immediately */
+ if (udev_device_get_timeout(dev) > 0) {
+ event_run(event, true);
+ return 0;
+ }
+
return 0;
}
@@ -577,7 +584,7 @@ static void event_queue_start(struct udev *udev)
continue;
}
- event_run(event);
+ event_run(event, false);
}
}
--
1.7.9.4
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