linux-kernel - [PATCH 4.19 264/264] usb: gadget: f_ncm: allow using NCM in SuperSpeed Plus gadgets.

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Message-Id: <20201027135443.053703269@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:55:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maciej Żenczykowski <maze@...gle.com>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Felipe Balbi <balbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 264/264] usb: gadget: f_ncm: allow using NCM in SuperSpeed Plus gadgets.

From: Lorenzo Colitti <lorenzo@...gle.com>

[ Upstream commit 7974ecd7d3c0f42a98566f281e44ea8573a2ad88 ]

Currently, enabling f_ncm at SuperSpeed Plus speeds results in an
oops in config_ep_by_speed because ncm_set_alt passes in NULL
ssp_descriptors. Fix this by re-using the SuperSpeed descriptors.
This is safe because usb_assign_descriptors calls
usb_copy_descriptors.

Tested: enabled f_ncm on a dwc3 gadget and 10Gbps link, ran iperf
Reviewed-by: Maciej Żenczykowski <maze@...gle.com>
Signed-off-by: Lorenzo Colitti <lorenzo@...gle.com>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/function/f_ncm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c
index 09bc917d407d4..e4aa370e86a9e 100644
--- a/drivers/usb/gadget/function/f_ncm.c
+++ b/drivers/usb/gadget/function/f_ncm.c
@@ -1523,7 +1523,7 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
 		fs_ncm_notify_desc.bEndpointAddress;
 
 	status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function,
-			ncm_ss_function, NULL);
+			ncm_ss_function, ncm_ss_function);
 	if (status)
 		goto fail;
 
-- 
2.25.1