From: Rob Clark <rob@ti.com>
Date: Fri, 28 Sep 2012 07:29:43 +0000 (+0200)
Subject: dma-buf: might_sleep() in dma_buf_unmap_attachment()
X-Git-Tag: v3.8-rc1~34^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6fa0cd62c5b9d47f8e5d42cb2876677a5ed701e;p=profile%2Fivi%2Fkernel-x86-ivi.git

dma-buf: might_sleep() in dma_buf_unmap_attachment()

We never really clarified if unmap could be done in atomic context.
But since mapping might require sleeping, this implies mutex in use
to synchronize mapping/unmapping, so unmap could sleep as well.  Add
a might_sleep() to clarify this.

Signed-off-by: Rob Clark <rob@ti.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
---

diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c
index 460e22d..a3f79c4 100644
--- a/drivers/base/dma-buf.c
+++ b/drivers/base/dma-buf.c
@@ -298,6 +298,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
 				struct sg_table *sg_table,
 				enum dma_data_direction direction)
 {
+	might_sleep();
+
 	if (WARN_ON(!attach || !attach->dmabuf || !sg_table))
 		return;