Re: [linux-usb-devel] Re: [PATCH 00/10] usb-serial: Switches fromspin lock to atomic_t.

[Luiz Fernando Capitulino]

On Wed, 7 Dec 2005 10:41:24 -0200
Luiz Fernando Capitulino <lcapitulino@xxxxxxxxxxxxxxx> wrote:

| On Wed, 07 Dec 2005 13:34:38 +0100
| Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
| 
| | On Wed, 2005-12-07 at 10:30 -0200, Luiz Fernando Capitulino wrote:
| | > On Wed, 07 Dec 2005 13:27:13 +0100
| | > Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
| | > 
| | > | 
| | > | >  Isn't it right? Is the URB write so fast that switching to atomic_t
| | > | > doesn't pay-off?
| | > | 
| | > | an atomic_t access and a spinlock are basically the same price... so
| | > | what's the payoff ?
| | > 
| | >  One lock less,
| | 
| | where? 
| 
|  In the 'usb_serial_port', my patch number nine removes the spin lock.

 struct 'usb_serial_port' I meant.

-- 
Luiz Fernando N. Capitulino
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