Re: Autosuspend for mass storage?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Am Samstag, 1. August 2009 07:15:44 schrieb Arjan van de Ven:
> > There were several different proposed kinds of autosuspend for USB mass
> > storage.  None of them proved to be sufficiently safe and acceptable to
> > the community.
>
> fwiw the device I care about most is a SD card reader, and most of all,
> when there is no card in the device.

Alan,

now that I think about it this use case uncovers a deficiency in the
autosuspend algorithm.
We basically assume that the likelihood a device is used again
in the near future declines with the time a device is not used. In this
use case the opposite is true. If a device finds that no medium
is present, user space has no reason to use this device immediately
again, but it may try again in the future when a medium might be present
again.
I think we should have a hook for suspending a device right now
from a driver that knows that the device will not be used right now.

	Regards
		Oliver

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux