[PATCH v2 3/3] drm/kms: allocate framebuffer cmap

[Clemens Ladisch <clemens@ladisch.de>]

Without an allocated colormap, FBIOGETCMAP fails.  This would make
programs restore an all-black colormap ("links -g") or fail to work
altogether ("mplayer -vo fbdev2").

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---
v2: implemented suggestions by James Simmons

 drivers/gpu/drm/drm_fb_helper.c |   4 ++++
 1 file changed, 4 insertions(+)

--- linux-2.6/drivers/gpu/drm/drm_fb_helper.c
+++ linux-2.6/drivers/gpu/drm/drm_fb_helper.c
@@ -905,6 +905,9 @@ int drm_fb_helper_single_fb_probe(struct
 
 	if (new_fb) {
 		info->var.pixclock = 0;
+		ret = fb_alloc_cmap(&info->cmap, crtc->gamma_size, 0);
+		if (ret)
+			return ret;
 		if (register_framebuffer(info) < 0)
 			return -EINVAL;
 	} else {
@@ -936,6 +939,7 @@ void drm_fb_helper_free(struct drm_fb_he
 		unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
 	}
 	drm_fb_helper_crtc_free(helper);
+	fb_dealloc_cmap(&helper->fb->fbdev->cmap);
 }
 EXPORT_SYMBOL(drm_fb_helper_free);