linux-kernel - [PATCH] iio: buffer: use dma_buf_unmap_attachment

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Message-Id: <20251114084725.2079196-1-buaajxlj@163.com>
Date: Fri, 14 Nov 2025 16:47:25 +0800
From: Liang Jie <buaajxlj@....com>
To: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-iio@...r.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Cc: liangjie@...iang.com,
	fanggeng@...iang.com,
	yangchen11@...iang.com
Subject: [PATCH] iio: buffer: use dma_buf_unmap_attachment_unlocked() helper

From: Liang Jie <liangjie@...iang.com>

Replace open-coded dma_resv_lock()/dma_resv_unlock() around
dma_buf_unmap_attachment() in iio_buffer_dmabuf_release() with the
dma_buf_unmap_attachment_unlocked() helper.

This aligns with the standard DMA-BUF API, avoids duplicating
locking logic and eases future maintenance. No functional change.

Reviewed-by: fanggeng <fanggeng@...iang.com>
Signed-off-by: Liang Jie <liangjie@...iang.com>
---
 drivers/iio/industrialio-buffer.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index a80f7cc25a27..58330abbf40a 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1563,9 +1563,7 @@ static void iio_buffer_dmabuf_release(struct kref *ref)
 	struct iio_buffer *buffer = priv->buffer;
 	struct dma_buf *dmabuf = attach->dmabuf;
 
-	dma_resv_lock(dmabuf->resv, NULL);
-	dma_buf_unmap_attachment(attach, priv->sgt, priv->dir);
-	dma_resv_unlock(dmabuf->resv);
+	dma_buf_unmap_attachment_unlocked(attach, priv->sgt, priv->dir);
 
 	buffer->access->detach_dmabuf(buffer, priv->block);
 
-- 
2.25.1