Re: [DVB patch 54/54] ttusb-budget: use time_after_eq()

Johannes Stezenbach
2005-09-05T00:08:08Z

On Sun, Sep 04, 2005 Nish Aravamudan wrote:
> On 9/4/05, Johannes Stezenbach <js@linuxtv.org> wrote:
> >
> > -static int numpkt = 0, lastj, numts, numstuff, numsec, numinvalid;
> > +static int numpkt = 0, numts, numstuff, numsec, numinvalid;
> > +static unsigned long lastj;
> >
> > static void ttusb_process_muxpack(struct ttusb *ttusb, const u8 * muxpack,
> > int len)
> > @@ -779,7 +781,7 @@ static void ttusb_iso_irq(struct urb *ur
> > u8 *data;
> > int len;
> > numpkt++;
> > - if ((jiffies - lastj) >= HZ) {
> > + if (time_after_eq(jiffies, lastj + HZ)) {
>
> I think you actually want:
>
> static void ttusb_iso_irq(....)
> {
> unsigned long lastj;
>
> ...
>
> lastj = jiffies + HZ;
> if (time_after_eq(jiffies, lastj)) {
> ...
>
> }
>
> The current code doesn't assign jiffies to lastj at any point that I see.

The code in question is used to print a one-per-second debug output,
and lastj is assigned after every print.

I agree that it's ugly, though.

Johannes