Messages in this thread | | | Date | Wed, 31 Oct 2012 10:08:40 +0800 | Subject | Re: [PATCH v3 2/6] PM / Runtime: introduce pm_runtime_set[get]_memalloc_noio() | From | Ming Lei <> |
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On Wed, Oct 31, 2012 at 12:30 AM, Oliver Neukum <oneukum@suse.de> wrote: >> 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
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