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drm/nv50-/kms: reject attempts at flipping to incompatible framebuffer

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Looks like a userspace bug can trigger this somehow during a mode
switch, causing: EVO complaint -> semaphores get out of sync ->
entire display stalled.

We likely want to be even stricter than this (or at least deal
better if EVO rejects our request), but I'll save that for the
drm_plane/atomic conversion and just fix the bug that I already
know can be triggered.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2014-12-22 19:50:23 +10:00
parent 0ea5fe8a83
commit 9ba8310647
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/nouveau/nv50_display.c
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@ -550,6 +550,10 @@ nv50_display_flip_next(struct drm_crtc *crtc, struct drm_framebuffer *fb,
u32 *push;
int ret;
if (crtc->primary->fb->width != fb->width ||
crtc->primary->fb->height != fb->height)
return -EINVAL;
swap_interval <<= 4;
if (swap_interval == 0)
swap_interval |= 0x100;