2016-10-04 15:26 GMT+02:00 Jiri Kosina <ji...@kernel.org>: > On Tue, 4 Oct 2016, Jörg Otte wrote: > >> With kernel 4.8.0-01558-g21f54dd I get thousands of >> "dvb-usb: bulk message failed: -11 (1/0)" >> messages in the logs and the DVB adapter is not working. >> >> It tourned out the new config option VMAP_STACK=y (which is the default) >> is the culprit. >> No problems for me with VMAP_STACK=n. > > I'd guess that this is EAGAIN coming from usb_hcd_map_urb_for_dma() as the > DVB driver is trying to perform on-stack DMA. > > Not really knowing which driver exactly you're using, I quickly skimmed > through DVB sources, and it turns out this indeed seems to be rather > common antipattern, and it should be fixed nevertheless. See > > cxusb_ctrl_msg() > dibusb_power_ctrl() > dibusb2_0_streaming_ctrl() > dibusb2_0_power_ctrl() > digitv_ctrl_msg() > dtt200u_fe_init() > dtt200u_fe_set_frontend() > dtt200u_power_ctrl() > dtt200u_streaming_ctrl() > dtt200u_pid_filter() > > Adding relevant CCs. > > -- > Jiri Kosina > SUSE Labs
Thanks for the quick response. Drivers are: dvb_core, dvb_usb, dbv_usb_cynergyT2 Jörg
