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 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
