From: Ville Syrjälä Date: Mon, 27 May 2013 17:19:56 +0000 (+0300) Subject: drm/fb-helper: Don't clobber the display palette when fbdev isn't bound X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8391a3d5bc6269cb0622c136ec7f125a2d5fb5f9;p=linux-beck.git 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 Signed-off-by: Ville Syrjälä Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 78219752dd0e..dff205849b34 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -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);