linux-kernel - [PATCH] dma_buf: remove dmabuf sysfs teardown before release/detach

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Message-ID: <20210719051944.40871-1-guangming.cao@mediatek.com>
Date:   Mon, 19 Jul 2021 13:19:44 +0800
From:   <guangming.cao@...iatek.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
CC:     <wsd_upstream@...iatek.com>,
        Guangming Cao <Guangming.Cao@...iatek.com>
Subject: [PATCH] dma_buf: remove dmabuf sysfs teardown before release/detach

From: Guangming Cao <Guangming.Cao@...iatek.com>

Dmabuf sysfs stat is used for dmabuf info track.
but these file maybe still use after buffer release/detach,
should clear it before buffer release/detach.

Signed-off-by: Guangming Cao <Guangming.Cao@...iatek.com>
---
 drivers/dma-buf/dma-buf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 510b42771974..9fa4620bd4bb 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -76,12 +76,12 @@ static void dma_buf_release(struct dentry *dentry)
 	 */
 	BUG_ON(dmabuf->cb_shared.active || dmabuf->cb_excl.active);
 
+	dma_buf_stats_teardown(dmabuf);
 	dmabuf->ops->release(dmabuf);
 
 	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
 		dma_resv_fini(dmabuf->resv);
 
-	dma_buf_stats_teardown(dmabuf);
 	module_put(dmabuf->owner);
 	kfree(dmabuf->name);
 	kfree(dmabuf);
@@ -875,10 +875,11 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
 	dma_resv_lock(dmabuf->resv, NULL);
 	list_del(&attach->node);
 	dma_resv_unlock(dmabuf->resv);
+
+	dma_buf_attach_stats_teardown(attach);
 	if (dmabuf->ops->detach)
 		dmabuf->ops->detach(dmabuf, attach);
 
-	dma_buf_attach_stats_teardown(attach);
 	kfree(attach);
 }
 EXPORT_SYMBOL_GPL(dma_buf_detach);
-- 
2.17.1