This patch series adds a mechanism to allow asynchronously validating the data stage of a control out request, and for stalling or suceeding the request accordingly. This mechanism is implemented for MUSB, and is used by UVC. At the same time, UVC packages the setup stage and data stage data together to send to userspace to save on a pair of context switches per control out request. This patch series does change the userspace API. We however believe that it is justified because the current API is broken, and because it isn't being used (because it's broken). The current API is broken such that it is subject to race conditions that cause fatal errors with a high frequency. This is actually what motivated this patch series in the first place. In the current API, not only is there no way to asynchronously validate the data stage of a control OUT request, but an empty buffer is expected to be provided to hold the data stage data -- which is more likely than not to be late. There is even a warning in musb_g_ep0_queue: /* else for sequence #2 (OUT), caller provides a buffer * before the next packet arrives. deferred responses * (after SETUP is acked) are racey. */ This problem has never been reported in years, which is a sign that the API isn't used. Furthermore, the vendor kernels that we have seen using the UVC gadget driver (such as QC and Huawei) are heavily patched with local changes to the API. This corroborates the suspicion that the current mainline API is not being used. Additionally, this API isn't meant to be used by generic applications, but by a dedicated userspace helper. uvc-gadget is one such example, but it has bitrotten and isn't compatible with the current kernel API. The fact that nobody has submitted patches nor complained for a long time again shows that it isn't being used. The conclusion is that since the API hasn't been used for a long time, it is safe to fix it. Paul Elder (6): usb: uvc: include videodev2.h in g_uvc.h usb: gadget: uvc: enqueue usb request in setup handler for control OUT usb: gadget: uvc: package setup and data for control OUT requests usb: gadget: add functions to signal udc driver to delay status stage usb: musb: gadget: implement send_response usb: gadget: uvc: allow ioctl to send response in status stage drivers/usb/gadget/function/f_uvc.c | 33 ++++++++++++++++----- drivers/usb/gadget/function/uvc.h | 1 + drivers/usb/gadget/function/uvc_v4l2.c | 21 +++++++++++++ drivers/usb/gadget/udc/core.c | 40 +++++++++++++++++++++++++ drivers/usb/musb/musb_gadget_ep0.c | 41 ++++++++++++++++++++++++++ include/linux/usb/gadget.h | 11 +++++++ include/uapi/linux/usb/g_uvc.h | 4 ++- 7 files changed, 142 insertions(+), 9 deletions(-) -- 2.18.0
