Set the NoFreeze flag on a userspace helper (userui or storage manager) so
that it can continue to function while we're doing I/O.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/netlink.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/kernel/power/netlink.c b/kernel/power/netlink.c
index 0aaf90e..7f06f7c 100644
--- a/kernel/power/netlink.c
+++ b/kernel/power/netlink.c
@@ -127,3 +127,28 @@ static void send_whether_debugging(struc
&is_debugging, sizeof(int));
}
+/*
+ * Set the PF_NOFREEZE flag on the given process to ensure it can run whilst we
+ * are suspending.
+ */
+static int nl_set_nofreeze(struct user_helper_data *uhd, int pid)
+{
+ struct task_struct *t;
+
+ read_lock(&tasklist_lock);
+ if ((t = find_task_by_pid(pid)) == NULL) {
+ read_unlock(&tasklist_lock);
+ printk("Strange. Can't find the userspace task %d.\n", pid);
+ return -EINVAL;
+ }
+
+ t->flags |= PF_NOFREEZE;
+
+ read_unlock(&tasklist_lock);
+ uhd->pid = pid;
+
+ suspend_send_netlink_message(uhd, NETLINK_MSG_NOFREEZE_ACK, NULL, 0);
+
+ return 0;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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