1 files changed, 13 insertions, 3 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 289c43a4726..b1606e07b7a 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -446,11 +446,11 @@ static unsigned int sysfs_poll(struct file *filp, poll_table *wait)
         if (buffer->event != atomic_read(&od->event))
                 goto trigger;
 
-        return 0;
+        return DEFAULT_POLLMASK;
 
  trigger:
         buffer->needs_read_fill = 1;
-        return POLLERR|POLLPRI;
+        return DEFAULT_POLLMASK|POLLERR|POLLPRI;
 }
 
 void sysfs_notify_dirent(struct sysfs_dirent *sd)
@@ -667,6 +667,7 @@ struct sysfs_schedule_callback_struct {
         struct work_struct      work;
 };
 
+static struct workqueue_struct *sysfs_workqueue;
 static DEFINE_MUTEX(sysfs_workq_mutex);
 static LIST_HEAD(sysfs_workq);
 static void sysfs_schedule_callback_work(struct work_struct *work)
@@ -715,11 +716,20 @@ int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
         mutex_lock(&sysfs_workq_mutex);
         list_for_each_entry_safe(ss, tmp, &sysfs_workq, workq_list)
                 if (ss->kobj == kobj) {
+                        module_put(owner);
                         mutex_unlock(&sysfs_workq_mutex);
                         return -EAGAIN;
                 }
         mutex_unlock(&sysfs_workq_mutex);
 
+        if (sysfs_workqueue == NULL) {
+                sysfs_workqueue = create_workqueue("sysfsd");
+                if (sysfs_workqueue == NULL) {
+                        module_put(owner);
+                        return -ENOMEM;
+                }
+        }
+
         ss = kmalloc(sizeof(*ss), GFP_KERNEL);
         if (!ss) {
                 module_put(owner);
@@ -735,7 +745,7 @@ int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
         mutex_lock(&sysfs_workq_mutex);
         list_add_tail(&ss->workq_list, &sysfs_workq);
         mutex_unlock(&sysfs_workq_mutex);
-        schedule_work(&ss->work);
+        queue_work(sysfs_workqueue, &ss->work);
         return 0;
 }
 EXPORT_SYMBOL_GPL(sysfs_schedule_callback);