drm: remove some potentially dangerous DRM_ERRORs

commit acb4b992d8a13728044f430b47b9199aa45993e9 upstream.

Each of these error messages can be caused by a broken or malicious
userspace wanting to spam the dmesg with useless info.  They're really
not worthy of DRM_DEBUG statements either; those are generally only
useful during bringup of new hardware or versions, and ought to be
removed before going upstream anyway.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2: s/r\./r->/ in drm_mode_addfb()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 8323fc3..25ce75d 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1625,10 +1625,8 @@ int drm_mode_cursor_ioctl(struct drm_device *dev,
        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;
 
-       if (!req->flags) {
-               DRM_ERROR("no operation set\n");
+       if (!req->flags)
                return -EINVAL;
-       }
 
        mutex_lock(&dev->mode_config.mutex);
        obj = drm_mode_object_find(dev, req->crtc_id, DRM_MODE_OBJECT_CRTC);
@@ -1641,7 +1639,6 @@ int drm_mode_cursor_ioctl(struct drm_device *dev,
 
        if (req->flags & DRM_MODE_CURSOR_BO) {
                if (!crtc->funcs->cursor_set) {
-                       DRM_ERROR("crtc does not support cursor\n");
                        ret = -ENXIO;
                        goto out;
                }
@@ -1654,7 +1651,6 @@ int drm_mode_cursor_ioctl(struct drm_device *dev,
                if (crtc->funcs->cursor_move) {
                        ret = crtc->funcs->cursor_move(crtc, req->x, req->y);
                } else {
-                       DRM_ERROR("crtc does not support cursor\n");
                        ret = -EFAULT;
                        goto out;
                }
@@ -1692,14 +1688,11 @@ int drm_mode_addfb(struct drm_device *dev,
        if (!drm_core_check_feature(dev, DRIVER_MODESET))
                return -EINVAL;
 
-       if ((config->min_width > r->width) || (r->width > config->max_width)) {
-               DRM_ERROR("mode new framebuffer width not within limits\n");
+       if ((config->min_width > r->width) || (r->width > config->max_width))
                return -EINVAL;
-       }
-       if ((config->min_height > r->height) || (r->height > config->max_height)) {
-               DRM_ERROR("mode new framebuffer height not within limits\n");
+
+       if ((config->min_height > r->height) || (r->height > config->max_height))
                return -EINVAL;
-       }
 
        mutex_lock(&dev->mode_config.mutex);
 
@@ -1756,7 +1749,6 @@ int drm_mode_rmfb(struct drm_device *dev,
        obj = drm_mode_object_find(dev, *id, DRM_MODE_OBJECT_FB);
        /* TODO check that we really get a framebuffer back. */
        if (!obj) {
-               DRM_ERROR("mode invalid framebuffer id\n");
                ret = -EINVAL;
                goto out;
        }
@@ -1767,7 +1759,6 @@ int drm_mode_rmfb(struct drm_device *dev,
                        found = 1;
 
        if (!found) {
-               DRM_ERROR("tried to remove a fb that we didn't own\n");
                ret = -EINVAL;
                goto out;
        }
@@ -1814,7 +1805,6 @@ int drm_mode_getfb(struct drm_device *dev,
        mutex_lock(&dev->mode_config.mutex);
        obj = drm_mode_object_find(dev, r->fb_id, DRM_MODE_OBJECT_FB);
        if (!obj) {
-               DRM_ERROR("invalid framebuffer id\n");
                ret = -EINVAL;
                goto out;
        }
@@ -1850,7 +1840,6 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
        mutex_lock(&dev->mode_config.mutex);
        obj = drm_mode_object_find(dev, r->fb_id, DRM_MODE_OBJECT_FB);
        if (!obj) {
-               DRM_ERROR("invalid framebuffer id\n");
                ret = -EINVAL;
                goto out_err1;
        }