udmabuf: set read/write flag when exporting

Otherwise, mmap fails when done with PROT_WRITE.

Suggested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20181114122029.16766-1-kraxel@redhat.com

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 5b44ef226904f9be2530b992c3d06ed338dca53c..fc359ca4503d127fda5f9f631f95d98c4a1d671a 100644 (file)
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -184,6 +184,7 @@ static long udmabuf_create(const struct udmabuf_create_list *head,
        exp_info.ops  = &udmabuf_ops;
        exp_info.size = ubuf->pagecount << PAGE_SHIFT;
        exp_info.priv = ubuf;
+       exp_info.flags = O_RDWR;
 
        buf = dma_buf_export(&exp_info);
        if (IS_ERR(buf)) {