On Sat, 2007-04-28 at 00:19 +0100, Alan Cox wrote:
> > +static ssize_t uio_read(struct file *filep, char __user *buf,
> > + size_t count, loff_t *ppos)
> > +{
> > + struct uio_listener *listener = filep->private_data;
> > + struct uio_device *idev = listener->dev;
> > + DECLARE_WAITQUEUE(wait, current);
> > + ssize_t retval;
> > + int event_count;
> > +
> > + if (idev->info->irq == UIO_IRQ_NONE)
> > + return -EIO;
> > +
> > + if (count != sizeof(int))
> > + return -EINVAL;
>
> AFAIK we don't currently have any platform that runs binaries with
> different sizes of "int" but this is a) an unsigned value anyway, and b)
> should be a fixed type (eg u32)
Good point.
> Otherwise it looks ok at the momenmt, although there is a real nasty
> waiting for anyone who tries to use it. At the point open is possible or
> IRQs can be enabled you are safe in the core merged as idev->info is
> always valid, but any driver module trying to go back via info->uio_dev
> has a NULL pointer for an early IRQ or open event.
>
> This means that the fasync support in the current code is basically
> unusable until this is fixed
We'll fix that ASAP.
tglx
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