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drm/qxl: fix framebuffer dirty rectangle tracking. 

Commit "c0fe07a drm/qxl: rewrite framebuffer support" has a bug in the
dirty rectangle tracking:  Instead of ignoring an empty dirty rectangle
when adding a new dirty region the dirty region gets extended to the
upper left corner.  Fix it.

Cc: linux-stable@vger.kernel.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-10-05 12:20:26 +02:00 committed by Dave Airlie
parent f6702681a0
commit 60906529be
1 changed files with 11 additions and 8 deletions
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19
drivers/gpu/drm/qxl/qxl_fb.c
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@ -144,14 +144,17 @@ static void qxl_dirty_update(struct qxl_fbdev *qfbdev,
spin_lock_irqsave(&qfbdev->dirty.lock, flags); spin_lock_irqsave(&qfbdev->dirty.lock, flags);
if (qfbdev->dirty.y1 < y) if ((qfbdev->dirty.y2 - qfbdev->dirty.y1) &&
y = qfbdev->dirty.y1; (qfbdev->dirty.x2 - qfbdev->dirty.x1)) {
if (qfbdev->dirty.y2 > y2) if (qfbdev->dirty.y1 < y)
y2 = qfbdev->dirty.y2; y = qfbdev->dirty.y1;
if (qfbdev->dirty.x1 < x) if (qfbdev->dirty.y2 > y2)
x = qfbdev->dirty.x1; y2 = qfbdev->dirty.y2;
if (qfbdev->dirty.x2 > x2) if (qfbdev->dirty.x1 < x)
x2 = qfbdev->dirty.x2; x = qfbdev->dirty.x1;
if (qfbdev->dirty.x2 > x2)
x2 = qfbdev->dirty.x2;
}
qfbdev->dirty.x1 = x; qfbdev->dirty.x1 = x;
qfbdev->dirty.x2 = x2; qfbdev->dirty.x2 = x2;