4.9-stable review patch. If anyone has any objections, please let me know.
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From: John Keeping john@metanate.com
[ Upstream commit 8813a59ed892305b5ac1b5b901740b1ad4b5fefa ]
If there are multiple functions associated with a configuration, then the UAC2 interfaces may not start at zero. Set the correct first interface number in the association descriptor so that the audio interfaces are enumerated correctly in this case.
Reviewed-by: Krzysztof Opasiak k.opasiak@samsung.com Signed-off-by: John Keeping john@metanate.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/function/f_uac2.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -1040,6 +1040,8 @@ afunc_bind(struct usb_configuration *cfg dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); return ret; } + iad_desc.bFirstInterface = ret; + std_ac_if_desc.bInterfaceNumber = ret; agdev->ac_intf = ret; agdev->ac_alt = 0;