On Fri, 2018-03-23 at 10:54 +0100, Greg Kroah-Hartman wrote: > 4.4-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Ming Lei <ming.lei@xxxxxxxxxx> > > > [ Upstream commit a4e84aae8139aca9fbfbced1f45c51ca81b57488 ] > > mtip32xx supposes that 'request_idx' passed to .init_request() > is tag of the request, and use that as request's tag to initialize > command header. > > After MQ IO scheduler is in, request tag assigned isn't same with > the request index anymore, so cause strange hardware failure on > mtip32xx, even whole system panic is triggered. [...] MQ IO schedulers were introduced in 4.11, so this shouldn't be needed in older branches. It also causes a performance regression (fixed upstream). Please revert this for 4.4 and 4.9. Ben. -- Ben Hutchings Software Developer, Codethink Ltd.