Re: [PATCH 002/002] USB: serial: sierra driver autosuspend support

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Am Freitag, 17. Juli 2009 04:00:12 schrieb Elina Pasheva:

> The sierra.c driver is sufficient to interact over USB interfaces for all
> of our modem products, so one driver fits all. However many of our modems
> today do not support Selective Suspend – they may crash or behave
> unpredictably when suspended -  but they may eventually support it.

In this case you should add those devices to the quirk list with
the RESET_RESUME quirk. As you currently do not implement
a handler for reset_resume, usbcore will leave those devices alone.

> Creating two separate drivers, one for SS modems and another for non-SS
> modems is not an option either because of the configuration management
> nightmare that would create. We also do not want to make any assumptions
> about the way a particular Linux kernel is configured for Power Management;
> our experience with Ubuntu is that power/level is ON so far, but other

Then the distros are to blame. A switch per drive already exists and we
cannot add redundant switches for individual drivers. For those devices
you know to crash adding a quirk will do the job.

	Regards
		Oliver

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