At Sun, 06 Jul 2003 14:21:52 +0100,
James Courtier-Dutton wrote:
>
> 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)
the second argument is added in the 2.5 USB-driver stack.
we have a (rather complex) wrapper for that, to compile the same
source both for 2.4 and 2.5 (even 2.2) kernels.
yeah, it needs more clean up...
Takashi
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