Bluetooth: ath3k: output firmware filename when request_firmware failed

This makes it much easier for the users to understand why the driver
refuses to load when the firmware is unavailable.
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

drivers/bluetooth/ath3k.c

@@ -30,6 +30,7 @@
 #include <net/bluetooth/bluetooth.h>
 
 #define VERSION "1.0"
+#define ATH3K_FIRMWARE	"ath3k-1.fw"
 
 #define ATH3K_DNLOAD				0x01
 #define ATH3K_GETSTATE				0x05
@@ -400,9 +401,15 @@ static int ath3k_probe(struct usb_interface *intf,
 		return 0;
 	}
 
-	if (request_firmware(&firmware, "ath3k-1.fw", &udev->dev) < 0) {
-		BT_ERR("Error loading firmware");
-		return -EIO;
+	ret = request_firmware(&firmware, ATH3K_FIRMWARE, &udev->dev);
+	if (ret < 0) {
+		if (ret == -ENOENT)
+			BT_ERR("Firmware file \"%s\" not found",
+							ATH3K_FIRMWARE);
+		else
+			BT_ERR("Firmware file \"%s\" request failed (err=%d)",
+							ATH3K_FIRMWARE, ret);
+		return ret;
 	}
 
 	ret = ath3k_load_firmware(udev, firmware);
@@ -441,4 +448,4 @@ MODULE_AUTHOR("Atheros Communications");
 MODULE_DESCRIPTION("Atheros AR30xx firmware driver");
 MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
-MODULE_FIRMWARE("ath3k-1.fw");
+MODULE_FIRMWARE(ATH3K_FIRMWARE);