On Wed, 31 Oct 2012, Ming Lei wrote:

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().

Why would you want to do that?  The probe and disconnect routines
usually -- but not always -- run in the khubd thread.  Surely you don't
want to prevent khubd from using GFP_KERNEL?

And what if probe runs in khubd but disconnect runs in a different 
thread?

Alan Stern

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