linux-kernel - [PATCH 4.9 101/109] dma-buf/sync_file: hold reference to fence when creating sync

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Message-Id: <20171207125646.195844203@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 13:57:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        Sean Paul <seanpaul@...omium.org>
Subject: [PATCH 4.9 101/109] dma-buf/sync_file: hold reference to fence when creating sync_file

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

commit 30cd85dd6edc86ea8d8589efb813f1fad41ef233 upstream.

fence referencing was out of balance. It was not taking any ref to the
fence at creating time, but it was putting a reference when freeing the
sync file.

This patch fixes the balancing issue by getting a reference for the fence
when creating the sync_file.

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1476899313-22241-1-git-send-email-gustavo@padovan.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma-buf/sync_file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma-buf/sync_file.c
+++ b/drivers/dma-buf/sync_file.c
@@ -79,7 +79,7 @@ struct sync_file *sync_file_create(struc
 	if (!sync_file)
 		return NULL;
 
-	sync_file->fence = fence;
+	sync_file->fence = fence_get(fence);
 
 	snprintf(sync_file->name, sizeof(sync_file->name), "%s-%s%llu-%d",
 		 fence->ops->get_driver_name(fence),