From a9cf8715180b18c62addbfe6f6267b8101903119 Mon Sep 17 00:00:00 2001
From: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Date: Fri, 3 Jul 2020 16:49:03 +0300
Subject: [PATCH] usb: gadget: f_uac2: fix AC Interface Header Descriptor wTotalLength
Git-commit: a9cf8715180b18c62addbfe6f6267b8101903119
Patch-mainline: v5.9-rc1
References: git-fixes

As per UAC2 spec (ch. 4.7.2), wTotalLength of AC Interface
Header Descriptor "includes the combined length of this
descriptor header and all Clock Source, Unit and Terminal
descriptors."

Thus add its size to its wTotalLength.

Also after recent changes wTotalLength is calculated
dynamically, update static definition of uac2_ac_header_descriptor
accordingly

Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/usb/gadget/function/f_uac2.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index db2d4980cb35..3633df6d7610 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -215,10 +215,7 @@ static struct uac2_ac_header_descriptor ac_hdr_desc = {
 	.bDescriptorSubtype = UAC_MS_HEADER,
 	.bcdADC = cpu_to_le16(0x200),
 	.bCategory = UAC2_FUNCTION_IO_BOX,
-	.wTotalLength = cpu_to_le16(sizeof in_clk_src_desc
-			+ sizeof out_clk_src_desc + sizeof usb_out_it_desc
-			+ sizeof io_in_it_desc + sizeof usb_in_ot_desc
-			+ sizeof io_out_ot_desc),
+	/* .wTotalLength = DYNAMIC */
 	.bmControls = 0,
 };
 
@@ -501,7 +498,7 @@ static void setup_descriptor(struct f_uac2_opts *opts)
 	as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 
 	iad_desc.bInterfaceCount = 1;
-	ac_hdr_desc.wTotalLength = 0;
+	ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 
 	if (EPIN_EN(opts)) {
 		u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
-- 
2.16.4