On Wed, Nov 25, 2015 at 10:25:39AM +0000, Russell King wrote:
> ipu_crtc_handle_pageflip() was calling drm_send_vblank_event() with
> a pipe argument of -1. Commit cc1ef118fc09 ("drm/irq: Make pipe
> unsigned and name consistent") now makes this error obvious, as we
> now may get a warning from:
>
> if (WARN_ON(pipe >= dev->num_crtcs))
>
> in drm_vblank_count_and_time(). Prior to this change, we would end
> up making out-of-bounds array accesses via:
>
> struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
> and
> *vblanktime = vblanktimestamp(dev, pipe, cur_vblank);
>
> So, this has been broken for a very long time, and is not a result
> of the above commit. Since we don't care about the staging versions,
> I've tagged this with the earliest mainline commit where we do care,
> even though this commit did not introduce the bug.
>
> Fixes: 6556f7f82b9c ("drm: imx: Move imx-drm driver out of staging")
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/imx/ipuv3-crtc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
> index 7bc8301fafff..7ce1df0f476a 100644
> --- a/drivers/gpu/drm/imx/ipuv3-crtc.c
> +++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
> @@ -212,7 +212,8 @@ static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
>
> spin_lock_irqsave(&drm->event_lock, flags);
> if (ipu_crtc->page_flip_event)
> - drm_send_vblank_event(drm, -1, ipu_crtc->page_flip_event);
> + drm_crtc_send_vblank_event(&ipu_crtc->base,
> + ipu_crtc->page_flip_event);
> ipu_crtc->page_flip_event = NULL;
> imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
> spin_unlock_irqrestore(&drm->event_lock, flags);
> --
> 2.1.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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