linux-kernel - [PATCH] usb: gadget: function: sync f

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Date:   Wed, 19 Dec 2018 12:08:32 +0000
From:   liangshengjun <liangshengjun@...ilicon.com>
To:     "balbi@...nel.org" <balbi@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] usb: gadget: function: sync f_uac1 ac header baInterfaceNr

f_uac1 audio control header descriptor default set baInterfaceNr[]={1,2},
but usb gadget make a configuration descriptor with more interfaces combination,
it can not confirm f_uac1 function linked first. So always keep baInterfaceNr[]={1,2}
is correct, and it is necessary to sync baInterfaceNr[] with usb_interface_id() value.

Signed-off-by: Liang Shengjun <liangshengjun@...ilicon.com>
---
 drivers/usb/gadget/function/f_uac1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index 28c1a78..d9aeb5c 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -581,6 +581,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 		goto fail;
 	as_out_interface_alt_0_desc.bInterfaceNumber = status;
 	as_out_interface_alt_1_desc.bInterfaceNumber = status;
+	ac_header_desc.baInterfaceNr[0] = status;
 	uac1->as_out_intf = status;
 	uac1->as_out_alt = 0;
 
@@ -589,6 +590,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 		goto fail;
 	as_in_interface_alt_0_desc.bInterfaceNumber = status;
 	as_in_interface_alt_1_desc.bInterfaceNumber = status;
+	ac_header_desc.baInterfaceNr[1] = status;
 	uac1->as_in_intf = status;
 	uac1->as_in_alt = 0;
 
-- 
2.7.4