Martin Natano wrote:
> Below the conversion from uiomovei() to uiomove() for bktr. The patch
> also replaces two occurrences of uio->uio_iov->iov_len with
> uio->uio_resid. I don't see a reason why bktr should inspect iov_len
> directly.
Looks good. As for computing count, we have 0 <= bktr->rows <= 0x7fe,
0 <= bktr->cols <= 0x3fe and pixfmt_table[bktr->pixfmt[.public.Bpp is 4
at most. So count is always positive even with an int and changing
it to size_t and calling uiomove keeps the same behavior as today.
Checking uio_resid and using ulmin also makes sense. bktr->vbisize is
bounded by VBI_BUFFER_SIZE and uio_resid is expected to be the sum
of the iov_len when video_read or vbi_read is called.
> Index: dev/pci/bktr/bktr_core.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/pci/bktr/bktr_core.c,v
> retrieving revision 1.36
> diff -u -p -u -r1.36 bktr_core.c
> --- dev/pci/bktr/bktr_core.c 14 Mar 2015 03:38:49 -0000 1.36
> +++ dev/pci/bktr/bktr_core.c 24 Jan 2016 11:25:49 -0000
> @@ -993,7 +993,7 @@ int
> video_read(bktr_ptr_t bktr, int unit, dev_t dev, struct uio *uio)
> {
> int status;
> - int count;
> + size_t count;
>
>
> if (bktr->bigbuf == 0) /* no frame buffer allocated (ioctl failed) */
> @@ -1008,7 +1008,7 @@ video_read(bktr_ptr_t bktr, int unit, de
> count = bktr->rows * bktr->cols *
> pixfmt_table[ bktr->pixfmt ].public.Bpp;
>
> - if ((int) uio->uio_iov->iov_len < count)
> + if (uio->uio_resid < count)
> return( EINVAL );
>
> bktr->flags &= ~(METEOR_CAP_MASK | METEOR_WANT_MASK);
> @@ -1027,7 +1027,7 @@ video_read(bktr_ptr_t bktr, int unit, de
>
> status = tsleep(BKTR_SLEEP, BKTRPRI, "captur", 0);
> if (!status) /* successful capture */
> - status = uiomovei((caddr_t)bktr->bigbuf, count, uio);
> + status = uiomove((caddr_t)bktr->bigbuf, count, uio);
> else
> printf ("%s: read: tsleep error %d\n",
> bktr_name(bktr), status);
> @@ -1047,7 +1047,7 @@ video_read(bktr_ptr_t bktr, int unit, de
> int
> vbi_read(bktr_ptr_t bktr, struct uio *uio, int ioflag)
> {
> - int readsize, readsize2;
> + size_t readsize, readsize2;
> int status;
>
>
> @@ -1067,22 +1067,20 @@ vbi_read(bktr_ptr_t bktr, struct uio *ui
> /* We cannot read more bytes than there are in
> * the circular buffer
> */
> - readsize = (int)uio->uio_iov->iov_len;
> -
> - if (readsize > bktr->vbisize) readsize = bktr->vbisize;
> + readsize = ulmin(uio->uio_resid, bktr->vbisize);
>
> /* Check if we can read this number of bytes without having
> * to wrap around the circular buffer */
> - if((bktr->vbistart + readsize) >= VBI_BUFFER_SIZE) {
> + if (readsize >= VBI_BUFFER_SIZE - bktr->vbistart) {
> /* We need to wrap around */
>
> readsize2 = VBI_BUFFER_SIZE - bktr->vbistart;
> - status = uiomovei((caddr_t)bktr->vbibuffer + bktr->vbistart,
> readsize2, uio);
> + status = uiomove((caddr_t)bktr->vbibuffer + bktr->vbistart,
> readsize2, uio);
> if (status == 0)
> - status = uiomovei((caddr_t)bktr->vbibuffer, (readsize -
> readsize2), uio);
> + status = uiomove((caddr_t)bktr->vbibuffer, (readsize -
> readsize2), uio);
> } else {
> /* We do not need to wrap around */
> - status = uiomovei((caddr_t)bktr->vbibuffer + bktr->vbistart,
> readsize, uio);
> + status = uiomove((caddr_t)bktr->vbibuffer + bktr->vbistart,
> readsize, uio);
> }
>
> /* Update the number of bytes left to read */
>
> cheers,
> natano
>
