Hi, you probably do not want to hear this. I was out of comission for the last week weeks and I should have looked at this more closely. You may notice that usb_control_msg() for times immemorial has been using GFP_NOIO internally. This is because control messages are needed in a lot of contexts such as SCSI error handling and runtime PM that require GFP_NOIO. IIRC at that time we found ourselves unable to go through all those call chains, so we pulled the nuclear option and slapped a blanket GFP_NOIO on the function. Today I got a patch that outright deleted a memory allocation with GFP_NOIO, so I looked into this. We are making the same mistake we couldn't fix in the past. I am afraid the API has to be changed to include memory flags. And we should do this now while the damage is still within limits. I am preparing patches. Regards Oliver
