linux-kernel - [PATCH 4.4 07/93] drm/nouveau/fifo/nv04: avoid ramht race against cookie insertion

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Message-Id: <20161006074731.459582246@linuxfoundation.org>
Date:   Thu,  6 Oct 2016 10:28:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: [PATCH 4.4 07/93] drm/nouveau/fifo/nv04: avoid ramht race against cookie insertion

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

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

From: Ilia Mirkin <imirkin@...m.mit.edu>

commit 666ca3d8f19082f40745d75f3cc7cc0200ee87e3 upstream.

Signed-off-by: Ilia Mirkin <imirkin@...m.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c
@@ -36,7 +36,10 @@ nv04_fifo_dma_object_dtor(struct nvkm_fi
 {
 	struct nv04_fifo_chan *chan = nv04_fifo_chan(base);
 	struct nvkm_instmem *imem = chan->fifo->base.engine.subdev.device->imem;
+
+	mutex_lock(&chan->fifo->base.engine.subdev.mutex);
 	nvkm_ramht_remove(imem->ramht, cookie);
+	mutex_unlock(&chan->fifo->base.engine.subdev.mutex);
 }
 
 static int