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usb: gadget: f_uac2: fix bFirstInterface in composite gadget

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[ 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>
This commit is contained in:
John Keeping 2018-01-12 18:43:32 +00:00 committed by Greg Kroah-Hartman
parent e0a6f895ad
commit 36e393b059
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/function/f_uac2.c
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@ -1052,6 +1052,8 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
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;