usb audio callback questions.

[James Courtier-Dutton <James@superbug.demon.co.uk>]

I have a question regarding the callbacks in the usbaudio.c driver.
The callback is defined as: -

/*
  * complete callback from data urb
  */
static void snd_complete_urb(struct urb *urb, struct pt_regs *regs)


The callback is set up with: -
u->urb->complete = snd_usb_complete_callback(snd_complete_urb);

The issue I have is that urb->complete is of type: -
struct urb;
typedef void (*usb_complete_t)(struct urb *);

struct urb
{
<snip>
         usb_complete_t complete;        // pointer to completion routine
<snip>
};

So, why is the "struct pt_regs *regs" there ?
I would think that
static void snd_complete_urb(struct urb *urb, struct pt_regs *regs)
should change to
static void snd_complete_urb(struct urb *urb)

Cheers
James



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