On Tue, Jul 13, 2010 at 12:50:40PM +0200, "Tegawendé F. Bissyandé" wrote:
> Hi,
>
> I have been using Coccinelle to validate some trivial rules of kernel
> API use by device drivers.
> I came accross the definition of an empty critical section in the
> 'bfusb_close' function in file drivers/bluetooth/bfusb.c
>
> static int bfusb_close(struct hci_dev *hdev)
> {
> ...
> write_lock_irqsave(&data->lock, flags);
> write_unlock_irqrestore(&data->lock, flags);
>
This is in the _close() function. It's waiting for all the readers to
finish. Presumably it's already ensured that no new reader threads will
launch.
regards,
dan carpenter
> bfusb_unlink_urbs(data);
> bfusb_flush(hdev);
>
> return 0;
> }
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