lkml.org 
[lkml]   [2008]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] USB: add USB test and measurement class driver - round 2
    On Wed, Aug 27, 2008 at 03:16:18PM -0400, Alan Stern wrote:
    > On Wed, 27 Aug 2008, Oliver Neukum wrote:
    >
    > > Am Mittwoch 27 August 2008 20:58:08 schrieb Alan Stern:
    > > > > And this rule depends on sharing the USB major or not. This needs
    > > > > a big fat mention in Documentation.
    > > >
    > > > You mean that the open/disconnect locking rule applies only to drivers
    > > > that call usb_register_dev, i.e, drivers using the USB major.  Right?
    > >
    > > Yes. In fact drivers not using the USB major but their own char devices
    > > will need such a lock. This is tricky.
    >
    > IMO all char-device registration/deregistration routines should use a
    > similar rwsem. Then device drivers wouldn't need to worry about it.
    >
    > > > I agree that it deserves to be mentioned in the documentation
    > > > somewhere.  Where would be a good place?  None of the existing files in
    > > > Documentation/usb seem appropriate.
    > >
    > > The USB major merits a file of its own.
    >
    > I don't feel competent to start writing such a file. Greg, what do you
    > think? Maybe all that's needed to get going is to "borrow" some of the
    > material in LDD3. :-)

    Well, as the USB chapter in LDD3 "borrowed" heavily from the comments in
    the usb code itself, that would only be fair :)

    That chapter needs to be reworked. The authors and Oreilly and I are
    currently talking about how to do this all in a framework that makes
    sense (the current one of a book every few years that quickly gets out
    of date doesn't make sense.)

    thanks,

    greg k-h
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2008-08-28 02:07    [W:0.042 / U:29.968 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site