1 files changed, 89 insertions, 37 deletions

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 10a4467c63f..c30df50e444 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -96,6 +96,15 @@ static inline long firmware_loading_timeout(void)
 	return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
 }
 
+/* firmware behavior options */
+#define FW_OPT_UEVENT	(1U << 0)
+#define FW_OPT_NOWAIT	(1U << 1)
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+#define FW_OPT_FALLBACK	(1U << 2)
+#else
+#define FW_OPT_FALLBACK	0
+#endif
+
 struct firmware_cache {
 	/* firmware_buf instance will be added into the below list */
 	spinlock_t lock;
@@ -219,6 +228,7 @@ static int fw_lookup_and_allocate_buf(const char *fw_name,
 }
 
 static void __fw_free_buf(struct kref *ref)
+	__releases(&fwc->lock)
 {
 	struct firmware_buf *buf = to_fwbuf(ref);
 	struct firmware_cache *fwc = buf->fwc;
@@ -270,43 +280,47 @@ module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
 MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
 
 /* Don't inline this: 'struct kstat' is biggish */
-static noinline_for_stack long fw_file_size(struct file *file)
+static noinline_for_stack int fw_file_size(struct file *file)
 {
 	struct kstat st;
 	if (vfs_getattr(&file->f_path, &st))
 		return -1;
 	if (!S_ISREG(st.mode))
 		return -1;
-	if (st.size != (long)st.size)
+	if (st.size != (int)st.size)
 		return -1;
 	return st.size;
 }
 
-static bool fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
+static int fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf)
 {
-	long size;
+	int size;
 	char *buf;
+	int rc;
 
 	size = fw_file_size(file);
 	if (size <= 0)
-		return false;
+		return -EINVAL;
 	buf = vmalloc(size);
 	if (!buf)
-		return false;
-	if (kernel_read(file, 0, buf, size) != size) {
+		return -ENOMEM;
+	rc = kernel_read(file, 0, buf, size);
+	if (rc != size) {
+		if (rc > 0)
+			rc = -EIO;
 		vfree(buf);
-		return false;
+		return rc;
 	}
 	fw_buf->data = buf;
 	fw_buf->size = size;
-	return true;
+	return 0;
 }
 
-static bool fw_get_filesystem_firmware(struct device *device,
+static int fw_get_filesystem_firmware(struct device *device,
 				       struct firmware_buf *buf)
 {
 	int i;
-	bool success = false;
+	int rc = -ENOENT;
 	char *path = __getname();
 
 	for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
@@ -321,14 +335,17 @@ static bool fw_get_filesystem_firmware(struct device *device,
 		file = filp_open(path, O_RDONLY, 0);
 		if (IS_ERR(file))
 			continue;
-		success = fw_read_file_contents(file, buf);
+		rc = fw_read_file_contents(file, buf);
 		fput(file);
-		if (success)
+		if (rc)
+			dev_warn(device, "firmware, attempted to load %s, but failed with error %d\n",
+				path, rc);
+		else
 			break;
 	}
 	__putname(path);
 
-	if (success) {
+	if (!rc) {
 		dev_dbg(device, "firmware: direct-loading firmware %s\n",
 			buf->fw_id);
 		mutex_lock(&fw_lock);
@@ -337,7 +354,7 @@ static bool fw_get_filesystem_firmware(struct device *device,
 		mutex_unlock(&fw_lock);
 	}
 
-	return success;
+	return rc;
 }
 
 /* firmware holds the ownership of pages */
@@ -813,7 +830,7 @@ static void firmware_class_timeout_work(struct work_struct *work)
 
 static struct firmware_priv *
 fw_create_instance(struct firmware *firmware, const char *fw_name,
-		   struct device *device, bool uevent, bool nowait)
+		   struct device *device, unsigned int opt_flags)
 {
 	struct firmware_priv *fw_priv;
 	struct device *f_dev;
@@ -825,7 +842,7 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
 		goto exit;
 	}
 
-	fw_priv->nowait = nowait;
+	fw_priv->nowait = !!(opt_flags & FW_OPT_NOWAIT);
 	fw_priv->fw = firmware;
 	INIT_DELAYED_WORK(&fw_priv->timeout_work,
 		firmware_class_timeout_work);
@@ -841,8 +858,8 @@ exit:
 }
 
 /* load a firmware via user helper */
-static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
-				  long timeout)
+static int _request_firmware_load(struct firmware_priv *fw_priv,
+				  unsigned int opt_flags, long timeout)
 {
 	int retval = 0;
 	struct device *f_dev = &fw_priv->dev;
@@ -878,7 +895,7 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
 		goto err_del_bin_attr;
 	}
 
-	if (uevent) {
+	if (opt_flags & FW_OPT_UEVENT) {
 		buf->need_uevent = true;
 		dev_set_uevent_suppress(f_dev, false);
 		dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
@@ -904,16 +921,16 @@ err_put_dev:
 
 static int fw_load_from_user_helper(struct firmware *firmware,
 				    const char *name, struct device *device,
-				    bool uevent, bool nowait, long timeout)
+				    unsigned int opt_flags, long timeout)
 {
 	struct firmware_priv *fw_priv;
 
-	fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
+	fw_priv = fw_create_instance(firmware, name, device, opt_flags);
 	if (IS_ERR(fw_priv))
 		return PTR_ERR(fw_priv);
 
 	fw_priv->buf = firmware->priv;
-	return _request_firmware_load(fw_priv, uevent, timeout);
+	return _request_firmware_load(fw_priv, opt_flags, timeout);
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -935,7 +952,7 @@ static void kill_requests_without_uevent(void)
 #else /* CONFIG_FW_LOADER_USER_HELPER */
 static inline int
 fw_load_from_user_helper(struct firmware *firmware, const char *name,
-			 struct device *device, bool uevent, bool nowait,
+			 struct device *device, unsigned int opt_flags,
 			 long timeout)
 {
 	return -ENOENT;
@@ -1016,7 +1033,7 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
 }
 
 static int assign_firmware_buf(struct firmware *fw, struct device *device,
-				bool skip_cache)
+			       unsigned int opt_flags)
 {
 	struct firmware_buf *buf = fw->priv;
 
@@ -1033,7 +1050,8 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
 	 * device may has been deleted already, but the problem
 	 * should be fixed in devres or driver core.
 	 */
-	if (device && !skip_cache)
+	/* don't cache firmware handled without uevent */
+	if (device && (opt_flags & FW_OPT_UEVENT))
 		fw_add_devm_name(device, buf->fw_id);
 
 	/*
@@ -1054,7 +1072,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
 /* called from request_firmware() and request_firmware_work_func() */
 static int
 _request_firmware(const struct firmware **firmware_p, const char *name,
-		  struct device *device, bool uevent, bool nowait)
+		  struct device *device, unsigned int opt_flags)
 {
 	struct firmware *fw;
 	long timeout;
@@ -1069,7 +1087,7 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
 
 	ret = 0;
 	timeout = firmware_loading_timeout();
-	if (nowait) {
+	if (opt_flags & FW_OPT_NOWAIT) {
 		timeout = usermodehelper_read_lock_wait(timeout);
 		if (!timeout) {
 			dev_dbg(device, "firmware: %s loading timed out\n",
@@ -1086,13 +1104,20 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
 		}
 	}
 
-	if (!fw_get_filesystem_firmware(device, fw->priv))
-		ret = fw_load_from_user_helper(fw, name, device,
-					       uevent, nowait, timeout);
+	ret = fw_get_filesystem_firmware(device, fw->priv);
+	if (ret) {
+		if (opt_flags & FW_OPT_FALLBACK) {
+			dev_warn(device,
+				 "Direct firmware load failed with error %d\n",
+				 ret);
+			dev_warn(device, "Falling back to user helper\n");
+			ret = fw_load_from_user_helper(fw, name, device,
+						       opt_flags, timeout);
+		}
+	}
 
-	/* don't cache firmware handled without uevent */
 	if (!ret)
-		ret = assign_firmware_buf(fw, device, !uevent);
+		ret = assign_firmware_buf(fw, device, opt_flags);
 
 	usermodehelper_read_unlock();
 
@@ -1134,12 +1159,37 @@ request_firmware(const struct firmware **firmware_p, const char *name,
 
 	/* Need to pin this module until return */
 	__module_get(THIS_MODULE);
-	ret = _request_firmware(firmware_p, name, device, true, false);
+	ret = _request_firmware(firmware_p, name, device,
+				FW_OPT_UEVENT | FW_OPT_FALLBACK);
 	module_put(THIS_MODULE);
 	return ret;
 }
 EXPORT_SYMBOL(request_firmware);
 
+#ifdef CONFIG_FW_LOADER_USER_HELPER
+/**
+ * request_firmware: - load firmware directly without usermode helper
+ * @firmware_p: pointer to firmware image
+ * @name: name of firmware file
+ * @device: device for which firmware is being loaded
+ *
+ * This function works pretty much like request_firmware(), but this doesn't
+ * fall back to usermode helper even if the firmware couldn't be loaded
+ * directly from fs.  Hence it's useful for loading optional firmwares, which
+ * aren't always present, without extra long timeouts of udev.
+ **/
+int request_firmware_direct(const struct firmware **firmware_p,
+			    const char *name, struct device *device)
+{
+	int ret;
+	__module_get(THIS_MODULE);
+	ret = _request_firmware(firmware_p, name, device, FW_OPT_UEVENT);
+	module_put(THIS_MODULE);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(request_firmware_direct);
+#endif
+
 /**
  * release_firmware: - release the resource associated with a firmware image
  * @fw: firmware resource to release
@@ -1162,7 +1212,7 @@ struct firmware_work {
 	struct device *device;
 	void *context;
 	void (*cont)(const struct firmware *fw, void *context);
-	bool uevent;
+	unsigned int opt_flags;
 };
 
 static void request_firmware_work_func(struct work_struct *work)
@@ -1173,7 +1223,7 @@ static void request_firmware_work_func(struct work_struct *work)
 	fw_work = container_of(work, struct firmware_work, work);
 
 	_request_firmware(&fw, fw_work->name, fw_work->device,
-			  fw_work->uevent, true);
+			  fw_work->opt_flags);
 	fw_work->cont(fw, fw_work->context);
 	put_device(fw_work->device); /* taken in request_firmware_nowait() */
 
@@ -1221,7 +1271,8 @@ request_firmware_nowait(
 	fw_work->device = device;
 	fw_work->context = context;
 	fw_work->cont = cont;
-	fw_work->uevent = uevent;
+	fw_work->opt_flags = FW_OPT_NOWAIT | FW_OPT_FALLBACK |
+		(uevent ? FW_OPT_UEVENT : 0);
 
 	if (!try_module_get(module)) {
 		kfree(fw_work);
@@ -1529,6 +1580,7 @@ static int fw_pm_notify(struct notifier_block *notify_block,
 	switch (mode) {
 	case PM_HIBERNATION_PREPARE:
 	case PM_SUSPEND_PREPARE:
+	case PM_RESTORE_PREPARE:
 		kill_requests_without_uevent();
 		device_cache_fw_images();
 		break;