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drm/fb-helper: Don't clobber the display palette when fbdev isn't bound 

Perform the drm_fb_helper_is_bound() check to avoid clobbering the
display palette of some other KMS client.

While at it, fix up the locking by grabbing all modeset locks for the
duration of the fb_setcmap operation.

v2: Make a note of the locking changes in the commit message

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>
This commit is contained in:
Ville Syrjälä 2013-05-27 20:19:56 +03:00 committed by Dave Airlie
parent 778ad903f9
commit 8391a3d5bc
1 changed files with 10 additions and 1 deletions
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11
drivers/gpu/drm/drm_fb_helper.c
View File

@ -640,12 +640,19 @@ static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_crtc_helper_funcs *crtc_funcs;
u16 *red, *green, *blue, *transp;
struct drm_crtc *crtc;
int i, j, rc = 0;
int start;
drm_modeset_lock_all(dev);
if (!drm_fb_helper_is_bound(fb_helper)) {
drm_modeset_unlock_all(dev);
return -EBUSY;
}
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
crtc_funcs = crtc->helper_private;
@ -668,10 +675,12 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
if (rc)
return rc;
goto out;
}
crtc_funcs->load_lut(crtc);
}
out:
drm_modeset_unlock_all(dev);
return rc;
}
EXPORT_SYMBOL(drm_fb_helper_setcmap);