linux-kernel - [PATCH v3] usb: gadget: f_uac2: Fix incorrect increment of bNumEndpoints

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Message-ID: <1674631645-28888-1-git-send-email-quic_prashk@quicinc.com>
Date:   Wed, 25 Jan 2023 12:57:25 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pavel Hofman <pavel.hofman@...tera.com>,
        Joe Perches <joe@...ches.com>, Julian Scheel <julian@...st.de>,
        Colin Ian King <colin.i.king@...il.com>
CC:     Pratham Pratap <quic_ppratap@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH v3] usb: gadget: f_uac2: Fix incorrect increment of bNumEndpoints

From: Pratham Pratap <quic_ppratap@...cinc.com>

Currently connect/disconnect of USB cable calls afunc_bind and
eventually increments the bNumEndpoints. Performing multiple
plugin/plugout will increment bNumEndpoints incorrectly, and on
the next plug-in it leads to invalid configuration of descriptor
and hence enumeration fails.

Fix this by resetting the value of bNumEndpoints to 1 on every
afunc_bind call.

Fixes: 40c73b30546e ("usb: gadget: f_uac2: add adaptive sync support for capture")
Signed-off-by: Pratham Pratap <quic_ppratap@...cinc.com>
Signed-off-by: Prashanth K <quic_prashk@...cinc.com>
---
v3: Added Fixes tag.

 drivers/usb/gadget/function/f_uac2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index 08726e4..0219cd7 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1142,6 +1142,7 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 		}
 		std_as_out_if0_desc.bInterfaceNumber = ret;
 		std_as_out_if1_desc.bInterfaceNumber = ret;
+		std_as_out_if1_desc.bNumEndpoints = 1;
 		uac2->as_out_intf = ret;
 		uac2->as_out_alt = 0;
 
-- 
2.7.4