On Wed, May 23, 2012 at 05:53:51PM +0800, Richard Zhao wrote:
> On Wed, May 23, 2012 at 05:51:00PM +0800, Richard Zhao wrote:
> > On Wed, May 23, 2012 at 05:35:22PM +0800, Richard Zhao wrote:
> > > On Wed, May 23, 2012 at 12:24:08PM +0300, Felipe Balbi wrote:
> > > > Hi,
> > > >
> > > > On Wed, May 23, 2012 at 11:13:40AM +0800, Richard Zhao wrote:
> > > >
> > > > needs commit log
> > > ok
> > > >
> > > > > Signed-off-by: Richard Zhao <richard.zhao@xxxxxxxxxxxxx>
> > > > > ---
> > > > > drivers/usb/chipidea/core.c | 20 ++++++++++++++++++--
> > > > > 1 files changed, 18 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> > > > > index d645396..767ccf7 100644
> > > > > --- a/drivers/usb/chipidea/core.c
> > > > > +++ b/drivers/usb/chipidea/core.c
> > > > > @@ -332,6 +332,23 @@ static irqreturn_t ci_irq(int irq, void *data)
> > > > > return ci->role == CI_ROLE_END ? ret : ci_role(ci)->irq(ci);
> > > > > }
> > > > >
> > > > > +static DEFINE_SPINLOCK(dev_id_lock);
> > > > > +static int dev_id;
> > > > > +
> > > > > +static int ci_get_id(void)
> > > > > +{
> > > > > + unsigned long flags;
> > > > > + int id;
> > > > > +
> > > > > + spin_lock_irqsave(&dev_id_lock, flags);
> > > > > + id = dev_id++;
> > > > > + if (dev_id < 0)
> > > > > + dev_id = 0;
> > > > > + spin_unlock_irqrestore(&dev_id_lock, flags);
> > > > > +
> > > > > + return id;
> > > > > +}
> > > >
> > > > if you used a bitmap you wouldn't need the lock.
> > > but it needs a loop. hmm.. bitmap is better. I'll change
> > > that way as dwc3_get_device_id.
> > Note that we'll need a ci13xxx_remove_device to put id.
> If it supports hotplug, the ids may be like 0 1 2 3 1 0 3 ...
> It's bad comparing to incremental method.
sorry, can you explain why that could/would happen and why is it bad ?
--
balbi
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