Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: [PATCH 4/5] usb_serial: Kill port mutex | Date | Wed, 7 Oct 2009 18:10:02 +0200 |
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Am Mittwoch, 7. Oktober 2009 18:03:08 schrieb Alan Stern: > On Wed, 7 Oct 2009, Oliver Neukum wrote: > > We will need some generic way to autoresume from open. > > Resume will need to lock against open() and need to be called > > from within open(). Any ideas for an unugly interface? > > It's not quite that bad. Resume doesn't need to lock against open. > If open is called while resume is running then when it tries to do its > own resume, it will either block (waiting for the pm_mutex) or return > immediately (if it sees the device is already resumed).
But resume() needs to know whether the read URBs need to be submitted or not.
Regards Oliver
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