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. Changes in v6: - MUSB giveback usb request to gadget driver after enqueueing for the status stage - Add event_status flag to uvc_device and use to keep track of if the gadget is in the status stage - If the uvc gadget is in the status stage and the completion handler is called, do nothing (as opposed to giving the uvc data back to userspace once more) Changes in v5: - Change parameter of usb_gadget_control_complete to simply take a usb_request - Make usb_gadget_control_complete do nothing if the request has no length (ie. no data stage) - musb: call usb_gadget_control_complete before usb_gadget_giveback_request - set musb ep0 state to statusin in ep0_send_ack - make sure to not double-write musb register in ep0_rxstate, since musb_g_ep0_giveback will take care of writing them Changes in v4: - Change wording and fix typo in patch 4/6 "usb: gadget: add mechanism to specify an explicit status stage" - Set explicit_status in usb_gadget_control_complete - Change explicit_status from unsigned int to bool Changes in v3: - Function driver send STALL status stage by simply calling usb_ep_set_halt, and ACK by enqueueing request - Fix signature of usb_gadget_control_complete to check the status of the request that was just given back. - Corresponding changes to musb and uvc gadget Changes in v2: Overhaul of status stage delay mechanism/API. Now if a function driver desires an explicit/delayed status stage, it specifies so in a flag in the usb_request that is queued for the data stage. The function driver later enqueues another usb_request for the status stage, also with the explicit_status flag set, and with the zero flag acting as the status. If a function driver does not desire an explicit status stage, then it can set (or ignore) the explicit_status flag in the usb_request that is queued for the data stage. To allow the optional explicit status stage, a UDC driver should call the newly added usb_gadget_control_complete right after usb_gadget_giveback_request, and in its queue function should check if the usb_request is for the status stage and if it has been requested to be explicit, and if so check the status that should be sent. (See 5/6 "usb: musb: gadget: implement optional explicit status stage" for an implementation for MUSB) 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 mechanism to specify an explicit status stage usb: musb: gadget: implement optional explicit status stage usb: gadget: uvc: allow ioctl to send response in status stage drivers/usb/gadget/function/f_uvc.c | 39 ++++++++++++++++++++------ drivers/usb/gadget/function/uvc.h | 2 ++ drivers/usb/gadget/function/uvc_v4l2.c | 19 +++++++++++++ drivers/usb/gadget/udc/core.c | 34 ++++++++++++++++++++++ drivers/usb/musb/musb_gadget.c | 2 ++ drivers/usb/musb/musb_gadget_ep0.c | 32 +++++++++++++++++++-- include/linux/usb/gadget.h | 10 +++++++ include/uapi/linux/usb/g_uvc.h | 4 ++- 8 files changed, 131 insertions(+), 11 deletions(-) -- 2.20.1
