On 7/17/05, Michal Januszewski <[email protected]> wrote:
> Hi.
>
> The fb_info struct, as defined in include/linux/fb.h, contains an element
> that is supposed to hold the current color map:
> struct fb_cmap cmap; /* Current cmap */
>
> This cmap is currently never updated when either fb_set_cmap() or
> fb_set_user_cmap() are called. As a result, info->cmap contains the
> default cmap that was set by a device driver/fbcon and a userspace
> application using the FBIOGETCMAP ioctl will not always get the
> *currently* used color map.
>
> The patch fixes this by making sure the cmap is copied to info->cmap
> after it is set correctly. It moves most of the code that is responsible
> for setting the cmap to fb_set_cmap() and out of fb_set_user_cmap() to
> avoid code-duplication.
>
> Signed-off-by: Michal Januszewski <[email protected]>
> ---
>
> diff -Nupr linux-2.6.12-orig/drivers/video/fbcmap.c linux-2.6.12/drivers/video/fbcmap.c
> --- linux-2.6.12-orig/drivers/video/fbcmap.c 2005-06-17 21:48:29.000000000 +0200
> +++ linux-2.6.12/drivers/video/fbcmap.c 2005-07-17 13:32:49.000000000 +0200
> @@ -212,7 +212,7 @@ int fb_cmap_to_user(struct fb_cmap *from
>
> int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
> {
> - int i, start;
> + int i, start, rc = 0;
> u16 *red, *green, *blue, *transp;
> u_int hred, hgreen, hblue, htransp = 0xffff;
>
> @@ -225,75 +225,51 @@ int fb_set_cmap(struct fb_cmap *cmap, st
> if (start < 0 || (!info->fbops->fb_setcolreg &&
'start' is initialized here by cmap->start which is an unsigned
integer, so testing start for <0 makes little sense.
> !info->fbops->fb_setcmap))
> return -EINVAL;
> - if (info->fbops->fb_setcmap)
> - return info->fbops->fb_setcmap(cmap, info);
> - for (i = 0; i < cmap->len; i++) {
> - hred = *red++;
> - hgreen = *green++;
> - hblue = *blue++;
> - if (transp)
> - htransp = *transp++;
> - if (info->fbops->fb_setcolreg(start++,
> - hred, hgreen, hblue, htransp,
> - info))
> - break;
> + if (info->fbops->fb_setcmap) {
> + rc = info->fbops->fb_setcmap(cmap, info);
> + } else {
> + for (i = 0; i < cmap->len; i++) {
> + hred = *red++;
> + hgreen = *green++;
> + hblue = *blue++;
> + if (transp)
> + htransp = *transp++;
> + if (info->fbops->fb_setcolreg(start++,
> + hred, hgreen, hblue,
> + htransp, info))
> + break;
> + }
> }
> - return 0;
> + if (rc == 0)
> + fb_copy_cmap(cmap, &info->cmap);
> +
> + return rc;
> }
>
> int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
> {
> - int i, start;
> - u16 __user *red, *green, *blue, *transp;
> - u_int hred, hgreen, hblue, htransp = 0xffff;
> -
> - red = cmap->red;
> - green = cmap->green;
> - blue = cmap->blue;
> - transp = cmap->transp;
> - start = cmap->start;
> -
> - if (start < 0 || (!info->fbops->fb_setcolreg &&
> - !info->fbops->fb_setcmap))
> + int rc, size = cmap->len * sizeof(u16);
> + struct fb_cmap umap;
> +
> + if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
cmap->start is of type __u32 as far as I can see, so testing it for <0
makes little sense.
> + !info->fbops->fb_setcmap))
> return -EINVAL;
>
> - /* If we can batch, do it */
> - if (info->fbops->fb_setcmap && cmap->len > 1) {
> - struct fb_cmap umap;
> - int size = cmap->len * sizeof(u16);
> - int rc;
> -
> - memset(&umap, 0, sizeof(struct fb_cmap));
> - rc = fb_alloc_cmap(&umap, cmap->len, transp != NULL);
> - if (rc)
> - return rc;
> - if (copy_from_user(umap.red, red, size) ||
> - copy_from_user(umap.green, green, size) ||
> - copy_from_user(umap.blue, blue, size) ||
> - (transp && copy_from_user(umap.transp, transp, size))) {
> - rc = -EFAULT;
> - }
> - umap.start = start;
> - if (rc == 0)
> - rc = info->fbops->fb_setcmap(&umap, info);
> - fb_dealloc_cmap(&umap);
> + memset(&umap, 0, sizeof(struct fb_cmap));
> + rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
> + if (rc)
> return rc;
> + if (copy_from_user(umap.red, cmap->red, size) ||
> + copy_from_user(umap.green, cmap->green, size) ||
> + copy_from_user(umap.blue, cmap->blue, size) ||
> + (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
> + fb_dealloc_cmap(&umap);
> + return -EFAULT;
> }
> -
> - for (i = 0; i < cmap->len; i++, red++, blue++, green++) {
> - if (get_user(hred, red) ||
> - get_user(hgreen, green) ||
> - get_user(hblue, blue) ||
> - (transp && get_user(htransp, transp)))
> - return -EFAULT;
> - if (info->fbops->fb_setcolreg(start++,
> - hred, hgreen, hblue, htransp,
> - info))
> - return 0;
> - if (transp)
> - transp++;
> - }
> - return 0;
> + umap.start = cmap->start;
> + rc = fb_set_cmap(&umap, info);
> + fb_dealloc_cmap(&umap);
> + return rc;
> }
>
> /**
>
>
>
>
>
--
Jesper Juhl <[email protected]>
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