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