mplayer -vo fbdev tries to create a screen that is twice as tall as the allocated framebuffer for "doublebuffering". By default, and all in-tree users, only sufficient memory is allocated and mapped to satisfy the smallest framebuffer and the virtual size is no larger than the actual. For these users, we should therefore reject any userspace request to create a screen that requires a buffer larger than the framebuffer originally allocated.
References: https://bugs.freedesktop.org/show_bug.cgi?id=38138 Signed-off-by: Chris Wilson chris@chris-wilson.co.uk --- drivers/gpu/drm/drm_fb_helper.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 7740dd2..a0d6e89 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -559,9 +559,13 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, return -EINVAL;
/* Need to resize the fb object !!! */ - if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) { + if (var->bits_per_pixel > fb->bits_per_pixel || + var->xres > fb->width || var->yres > fb->height || + var->xres_virtual > fb->width || var->yres_virtual > fb->height) { DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb " - "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel, + "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", + var->xres, var->yres, var->bits_per_pixel, + var->xres_virtual, var->yres_virtual, fb->width, fb->height, fb->bits_per_pixel); return -EINVAL; }