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    SubjectRe: [PATCH 00/10] usb-serial: Switches from spin lock to atomic_t.
    On Tue, Dec 06, 2005 at 09:56:10AM -0200, Luiz Fernando Capitulino wrote:
    > Greg,
    > Don't get scared. :-)
    > As showed by Eduardo Habkost some days ago, the spin lock 'lock' in the
    > struct 'usb_serial_port' is being used by some USB serial drivers to protect
    > the access to the 'write_urb_busy' member of the same struct.
    > The spin lock however, is needless: we can change 'write_urb_busy' type
    > to be atomic_t and remove all the spin lock usage.

    But if you do that, you make things slower on non-smp machines, which
    isn't very nice. Why does the spinlock bother you?


    greg k-h
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