Ajay Kumar Gupta wrote: > Current musb host driver does the giveback of completed urb first and > then start the next request. This is significantly affecting the streaming > from an USB camera wherein we observe huge delay between the two IN tokens > from musb host. This is due to the fact that UVC driver is doing decoding > and further processing in giveback context. > > The patch tries to defer the giveback part to a workqueue and continues > with the start of new request in completion path. Suggest allocating a per-urb structure when a new URB is enqueued. This structure contains the completion/giveback work item. This avoids having to a) allocate memory on completion; b) create a second queue structure. David -- David Vrabel, Senior Software Engineer, Drivers CSR, Churchill House, Cambridge Business Park, Tel: +44 (0)1223 692562 Cowley Road, Cambridge, CB4 0WZ http://www.csr.com/ Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
