Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio()

On Wed, Oct 31, 2012 at 12:30 AM, Oliver Neukum [off-list ref] wrote:

quoted

If the USB mass-storage device is being reseted, the flag should be set
already generally.  If the flag is still unset, that means the disk/network
device isn't added into system(or removed just now), so memory allocation
with block I/O should be allowed during the reset. Looks it isn't one problem,
isn't it?

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.


Thanks,
--
Ming Lei