linux-kernel - [PATCH 4.1 119/123] drm/nouveau/kms/nv50-: guard against enabling cursor on disabled heads

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Date:	Sat,  8 Aug 2015 15:09:57 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ben Skeggs <bskeggs@...hat.com>
Subject: [PATCH 4.1 119/123] drm/nouveau/kms/nv50-: guard against enabling cursor on disabled heads

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Skeggs <bskeggs@...hat.com>

commit 697bb728d9e2367020aa0c5af7363809d7658e43 upstream.

Userspace has started doing this, which upsets the display class hw
error checking in various unpleasant ways.

Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/nouveau/nv50_display.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -979,7 +979,7 @@ nv50_crtc_cursor_show_hide(struct nouvea
 {
 	struct nv50_mast *mast = nv50_mast(nv_crtc->base.dev);
 
-	if (show && nv_crtc->cursor.nvbo)
+	if (show && nv_crtc->cursor.nvbo && nv_crtc->base.enabled)
 		nv50_crtc_cursor_show(nv_crtc);
 	else
 		nv50_crtc_cursor_hide(nv_crtc);


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