Re: [PATCH] fbdev: Update info->cmap when setting cmap from user-/kernelspace.
From: Jesper Juhl <hidden>
Date: 2005-07-17 18:16:04
Also in:
lkml
On 7/17/05, Michal Januszewski [off-list ref] wrote:
quoted hunk ↗ jump to hunk
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 <spock@gentoo.org> --- 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 [off-list ref] Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html