From 03cc3716140e9694c1224dfe773f69902396c9e9 Mon Sep 17 00:00:00 2001
From: John Sheu <sheu@google.com>
Date: Mon, 11 Feb 2013 17:50:24 -0800
Subject: [PATCH] --- yaml --- r: 359751 b: refs/heads/master c:
 495c10cc1c0c359871d5bef32dd173252fc17995 h: refs/heads/master i:   359749:
 d61eb6939febb8397ab1a3352e661ac71036889e   359747:
 5024aed85f28ad4b0f21f28391060ca61562a293   359743:
 feda94258ab8682e3ee952551cb07f507ac295c5 v: v3

---
 [refs]                       |  2 +-
 trunk/drivers/base/dma-buf.c | 23 +++++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index 9effbbfea81a..f0545dc293f2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f00b4dad9d9eb001a04cf72e8351a2a1b9e99322
+refs/heads/master: 495c10cc1c0c359871d5bef32dd173252fc17995
diff --git a/trunk/drivers/base/dma-buf.c b/trunk/drivers/base/dma-buf.c
index 394523807a6d..2a7cb0df176b 100644
--- a/trunk/drivers/base/dma-buf.c
+++ b/trunk/drivers/base/dma-buf.c
@@ -447,6 +447,9 @@ EXPORT_SYMBOL_GPL(dma_buf_kunmap);
 int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 		 unsigned long pgoff)
 {
+	struct file *oldfile;
+	int ret;
+
 	if (WARN_ON(!dmabuf || !vma))
 		return -EINVAL;
 
@@ -460,14 +463,22 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 		return -EINVAL;
 
 	/* readjust the vma */
-	if (vma->vm_file)
-		fput(vma->vm_file);
-
-	vma->vm_file = get_file(dmabuf->file);
-
+	get_file(dmabuf->file);
+	oldfile = vma->vm_file;
+	vma->vm_file = dmabuf->file;
 	vma->vm_pgoff = pgoff;
 
-	return dmabuf->ops->mmap(dmabuf, vma);
+	ret = dmabuf->ops->mmap(dmabuf, vma);
+	if (ret) {
+		/* restore old parameters on failure */
+		vma->vm_file = oldfile;
+		fput(dmabuf->file);
+	} else {
+		if (oldfile)
+			fput(oldfile);
+	}
+	return ret;
+
 }
 EXPORT_SYMBOL_GPL(dma_buf_mmap);