Hi,
On Wed, May 23, 2012 at 11:13:40AM +0800, Richard Zhao wrote:
needs commit log
> 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.
--
balbi
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