diff options
| -rw-r--r-- | drivers/base/firmware_class.c | 44 |
1 files changed, 37 insertions, 7 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 4b1f9265887f..e650c25360d1 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 +451,9 @@ 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; - + list_del_init(&buf->pending_list); set_bit(FW_STATUS_ABORT, &buf->status); complete_all(&buf->completion); } @@ -457,6 +461,25 @@ 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) @@ -604,6 +627,7 @@ 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; } @@ -612,7 +636,7 @@ static ssize_t firmware_loading_store(struct device *dev, dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading); /* fallthrough */ case -1: - fw_load_abort(fw_priv); + fw_load_abort(fw_buf); break; } out: @@ -680,7 +704,7 @@ static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) new_pages = kmalloc(new_array_size * sizeof(void *), GFP_KERNEL); if (!new_pages) { - fw_load_abort(fw_priv); + fw_load_abort(buf); return -ENOMEM; } memcpy(new_pages, buf->pages, @@ -697,7 +721,7 @@ static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) alloc_page(GFP_KERNEL | __GFP_HIGHMEM); if (!buf->pages[buf->nr_pages]) { - fw_load_abort(fw_priv); + fw_load_abort(buf); return -ENOMEM; } buf->nr_pages++; @@ -781,7 +805,7 @@ static void firmware_class_timeout_work(struct work_struct *work) mutex_unlock(&fw_lock); return; } - fw_load_abort(fw_priv); + fw_load_abort(fw_priv->buf); mutex_unlock(&fw_lock); } @@ -857,6 +881,10 @@ 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); @@ -1517,6 +1545,7 @@ 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; @@ -1530,6 +1559,7 @@ 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 } |