Messages in this thread | | | Date | Wed, 31 Oct 2012 11:05:33 +0800 | Subject | Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio() | From | Ming Lei <> |
| |
On Wed, Oct 31, 2012 at 10:08 AM, Ming Lei <ming.lei@canonical.com> wrote: >> I am afraid it is, because a disk may just have been probed as the deviceis being reset. > > Yes, it is probable, and sounds like similar with 'root_wait' problem, see > prepare_namespace(): init/do_mounts.c, so looks no good solution > for the problem, and maybe we have to set the flag always before resetting > usb device.
The below idea may help the problem which 'memalloc_noio' flag isn't set during usb_reset_device().
- for usb mass storage device, call pm_runtime_set_memalloc_noio(true) inside usb_stor_probe2() and uas_probe(), and call pm_runtime_set_memalloc_noio(false) inside uas_disconnect() and usb_stor_disconnect().
- for usb network device, register_netdev() is always called inside usb interface's probe(), looks no such problem.
Thanks, -- Ming Lei
| |