Re: [PATCH v2 0/3] usb: gadget: functionfs: DMABUF import interface

[Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>]

Hi Paul,

W dniu 22.03.2023 o 10:21, Paul Cercueil pisze:
> Hi,
>
> This small patchset adds three new IOCTLs that can be used to attach,
> detach, or transfer from/to a DMABUF object.
>
> Changes since v1:
> - patch [2/3] is new. I had to reuse a piece of code that was already
>    duplicated in the driver, so I factorized the code.
> - Make ffs_dma_resv_lock() static
> - Add MODULE_IMPORT_NS(DMA_BUF);
> - The attach/detach functions are now performed without locking the
>    eps_lock spinlock. The transfer function starts with the spinlock
>    unlocked, then locks it before allocating and queueing the USB
>    transfer.

Can you share an example use case for these new features?
Is there a userspace that excercises the new ioctls?

Regards,

Andrzej