dma-buf: add ref counting for module as exporter
Add reference counting on a kernel module that exports dma-buf and implements its operations. This prevents the module from being unloaded while DMABUF file is in use. The original patch [1] was submitted by Tomasz Stanislawski, but this is a simpler way to do it. v3: call module_put() as late as possible, per gregkh's comment. v2: move owner to struct dma_buf, and use DEFINE_DMA_BUF_EXPORT_INFO macro to simplify the change. Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NSumit Semwal <sumit.semwal@linaro.org> [1]: https://lkml.org/lkml/2012/8/8/163
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