FAILED: patch "[PATCH] Bluetooth: btusb: Handle download_firmware failure cases" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 00c0ee9850b7b0cb7c40b8daba806ae2245e59d4 Mon Sep 17 00:00:00 2001
From: Mark Chen <[email protected]>
Date: Tue, 7 Dec 2021 01:33:42 +0800
Subject: [PATCH] Bluetooth: btusb: Handle download_firmware failure cases

For Mediatek chipset, it can not enabled if there are something wrong in btmtk_setup_firmware_79xx(). Thus, the process must be terminated and returned error code.

index fda5622b1d6e..c9619096d763 100644
@@ -2633,6 +2633,10 @@ static int btusb_mtk_setup(struct hci_dev *hdev)
 			 dev_id & 0xffff, (fw_version & 0xff) + 1);
 		err = btmtk_setup_firmware_79xx(hdev, fw_bin_name,
 						btusb_mtk_hci_wmt_sync);
+		if (err < 0) {
+			bt_dev_err(hdev, "Failed to set up firmware (%d)", err);
+			return err;
+		}
 
 		/* It's Device EndPoint Reset Option Register */
 		btusb_mtk_uhw_reg_write(data, MTK_EP_RST_OPT, MTK_EP_RST_IN_OUT_OPT);