linux-kernel - [PATCH 2/2] sample/mdev/mbochs: add mbochs_kunmap

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Message-Id: <20180625064453.19768-2-kraxel@redhat.com>
Date:   Mon, 25 Jun 2018 08:44:52 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     alex.williamson@...hat.com
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        christian.koenig@....com, daniel.vetter@...ll.ch,
        Gerd Hoffmann <kraxel@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        kvm@...r.kernel.org (open list:VFIO MEDIATED DEVICE DRIVERS)
Subject: [PATCH 2/2] sample/mdev/mbochs: add mbochs_kunmap_dmabuf

There is no default implementation for dma_buf_ops->unmap.
So add a function unmapping the page, otherwise we'll leak them.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 samples/vfio-mdev/mbochs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index aa25cda21d..85ac603769 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -811,11 +811,18 @@ static void *mbochs_kmap_dmabuf(struct dma_buf *buf, unsigned long page_num)
 	return kmap(page);
 }
 
+static void mbochs_kunmap_dmabuf(struct dma_buf *buf, unsigned long page_num,
+				 void *vaddr)
+{
+	kunmap(vaddr);
+}
+
 static struct dma_buf_ops mbochs_dmabuf_ops = {
 	.map_dma_buf	  = mbochs_map_dmabuf,
 	.unmap_dma_buf	  = mbochs_unmap_dmabuf,
 	.release	  = mbochs_release_dmabuf,
 	.map		  = mbochs_kmap_dmabuf,
+	.unmap		  = mbochs_kunmap_dmabuf,
 	.mmap		  = mbochs_mmap_dmabuf,
 };
 
-- 
2.9.3