Merge branch 'upstream/android-3.10' into linaro-fixes/android-3.10

2 files changed, 43 insertions, 4 deletions

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 01e21037d8fe..55d682e6ecea 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -27,6 +27,7 @@
 #include <linux/pm.h>
 #include <linux/suspend.h>
 #include <linux/syscore_ops.h>
+#include <linux/reboot.h>
 
 #include <generated/utsrelease.h>
 
@@ -130,6 +131,7 @@ struct firmware_buf {
 	struct page **pages;
 	int nr_pages;
 	int page_array_size;
+	struct list_head pending_list;
 #endif
 	char fw_id[];
 };
@@ -171,6 +173,9 @@ static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
 	strcpy(buf->fw_id, fw_name);
 	buf->fwc = fwc;
 	init_completion(&buf->completion);
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+	INIT_LIST_HEAD(&buf->pending_list);
+#endif
 
 	pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
 
@@ -446,10 +451,8 @@ static struct firmware_priv *to_firmware_priv(struct device *dev)
 	return container_of(dev, struct firmware_priv, dev);
 }
 
-static void fw_load_abort(struct firmware_priv *fw_priv)
+static void __fw_load_abort(struct firmware_buf *buf)
 {
-	struct firmware_buf *buf = fw_priv->buf;
-
 	/*
 	 * There is a small window in which user can write to 'loading'
 	 * between loading done and disappearance of 'loading'
@@ -457,8 +460,16 @@ static void fw_load_abort(struct firmware_priv *fw_priv)
 	if (test_bit(FW_STATUS_DONE, &buf->status))
 		return;
 
+	list_del_init(&buf->pending_list);
 	set_bit(FW_STATUS_ABORT, &buf->status);
 	complete_all(&buf->completion);
+}
+
+static void fw_load_abort(struct firmware_priv *fw_priv)
+{
+	struct firmware_buf *buf = fw_priv->buf;
+
+	__fw_load_abort(buf);
 
 	/* avoid user action after loading abort */
 	fw_priv->buf = NULL;
@@ -467,6 +478,25 @@ static void fw_load_abort(struct firmware_priv *fw_priv)
 #define is_fw_load_aborted(buf)	\
 	test_bit(FW_STATUS_ABORT, &(buf)->status)
 
+static LIST_HEAD(pending_fw_head);
+
+/* reboot notifier for avoid deadlock with usermode_lock */
+static int fw_shutdown_notify(struct notifier_block *unused1,
+			      unsigned long unused2, void *unused3)
+{
+	mutex_lock(&fw_lock);
+	while (!list_empty(&pending_fw_head))
+		__fw_load_abort(list_first_entry(&pending_fw_head,
+					       struct firmware_buf,
+					       pending_list));
+	mutex_unlock(&fw_lock);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block fw_shutdown_nb = {
+	.notifier_call = fw_shutdown_notify,
+};
+
 static ssize_t firmware_timeout_show(struct class *class,
 				     struct class_attribute *attr,
 				     char *buf)
@@ -619,6 +649,7 @@ static ssize_t firmware_loading_store(struct device *dev,
 			 * is completed.
 			 * */
 			fw_map_pages_buf(fw_buf);
+			list_del_init(&fw_buf->pending_list);
 			complete_all(&fw_buf->completion);
 			break;
 		}
@@ -868,6 +899,10 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
 		kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
 	}
 
+	mutex_lock(&fw_lock);
+	list_add(&buf->pending_list, &pending_fw_head);
+	mutex_unlock(&fw_lock);
+
 	wait_for_completion(&buf->completion);
 
 	cancel_delayed_work_sync(&fw_priv->timeout_work);
@@ -1526,6 +1561,7 @@ static int __init firmware_class_init(void)
 {
 	fw_cache_init();
 #ifdef CONFIG_FW_LOADER_USER_HELPER
+	register_reboot_notifier(&fw_shutdown_nb);
 	return class_register(&firmware_class);
 #else
 	return 0;
@@ -1539,6 +1575,7 @@ static void __exit firmware_class_exit(void)
 	unregister_pm_notifier(&fw_cache.pm_notify);
 #endif
 #ifdef CONFIG_FW_LOADER_USER_HELPER
+	unregister_reboot_notifier(&fw_shutdown_nb);
 	class_unregister(&firmware_class);
 #endif
 }
diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 3511b0840362..ccaef8b48eba 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -363,7 +363,9 @@ static int ashmem_shrink(struct shrinker *s, struct shrink_control *sc)
 	if (!sc->nr_to_scan)
 		return lru_count;
 
-	mutex_lock(&ashmem_mutex);
+	if (!mutex_trylock(&ashmem_mutex))
+		return -1;
+
 	list_for_each_entry_safe(range, next, &ashmem_lru_list, lru) {
 		loff_t start = range->pgstart * PAGE_SIZE;
 		loff_t end = (range->pgend + 1) * PAGE_SIZE;