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[ Upstream commitce405d561b] As per the documentation, function usb_ep_free_request guarantees the request will not be queued or no longer be re-queued (or otherwise used). However, with the current implementation it doesn't make sure that the request in ep0 isn't reused. Fix this by dequeuing the ep0req on functionfs_unbind before freeing the request to align with the definition. Fixes:ddf8abd259("USB: f_fs: the FunctionFS driver") Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com> Tested-by: Krishna Kurapati <quic_kriskura@quicinc.com> Link: https://lore.kernel.org/r/20221215052906.8993-3-quic_ugoswami@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>