[PATCH v3 2/4] staging: kpc2000: kpc_dma: Convert set_page_dirty() --> set_page_dirty_lock()

[Souptick Joarder]

First, convert set_page_dirty() to set_page_dirty_lock()

Second, there is an interval in there after set_page_dirty() and
before put_page(), in which the device could be running and setting
pages dirty. Moving set_page_dirty_lock() after dma_unmap_sg().

Signed-off-by: Souptick Joarder <jrdr.li...@gmail.com>
Suggested-by: John Hubbard <jhubb...@nvidia.com>
Cc: John Hubbard <jhubb...@nvidia.com>
Cc: Bharath Vedartham <linux.b...@gmail.com>
Cc: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/staging/kpc2000/kpc_dma/fileops.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c 
b/drivers/staging/kpc2000/kpc_dma/fileops.c
index becdb41..08d90a6 100644
--- a/drivers/staging/kpc2000/kpc_dma/fileops.c
+++ b/drivers/staging/kpc2000/kpc_dma/fileops.c
@@ -215,13 +215,13 @@ void  transfer_complete_cb(struct aio_cb_data *acd, 
size_t xfr_count, u32 flags)
        BUG_ON(!acd->ldev);
        BUG_ON(!acd->ldev->pldev);
 
+       dma_unmap_sg(&acd->ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, 
acd->ldev->dir);
+
        for (i = 0 ; i < acd->page_count ; i++) {
                if (!PageReserved(acd->user_pages[i]))
-                       set_page_dirty(acd->user_pages[i]);
+                       set_page_dirty_lock(acd->user_pages[i]);
        }
 
-       dma_unmap_sg(&acd->ldev->pldev->dev, acd->sgt.sgl, acd->sgt.nents, 
acd->ldev->dir);
-
        for (i = 0 ; i < acd->page_count ; i++)
                put_page(acd->user_pages[i]);
 
-- 
1.9.1