linux-kernel - [PATCH v2 07/13] dmaengine: lgm: use sg_nents_for

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Message-ID: <20251110103805.3562136-8-andriy.shevchenko@linux.intel.com>
Date: Mon, 10 Nov 2025 11:23:34 +0100
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Stefan Wahren <wahrenst@....net>,
	Vinod Koul <vkoul@...nel.org>,
	Thomas Andreatta <thomasandreatta2000@...il.com>,
	Caleb Sander Mateos <csander@...estorage.com>,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org
Cc: Olivier Dautricourt <olivierdautricourt@...il.com>,
	Stefan Roese <sr@...x.de>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Lizhi Hou <lizhi.hou@....com>,
	Brian Xu <brian.xu@....com>,
	Raj Kumar Rampelli <raj.kumar.rampelli@....com>,
	Michal Simek <michal.simek@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 07/13] dmaengine: lgm: use sg_nents_for_dma() helper

Instead of open coded variant let's use recently introduced helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/lgm/lgm-dma.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c
index 8173c3f1075a..7d4d3dde6d88 100644
--- a/drivers/dma/lgm/lgm-dma.c
+++ b/drivers/dma/lgm/lgm-dma.c
@@ -1164,8 +1164,8 @@ ldma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	struct dw2_desc *hw_ds;
 	struct dw2_desc_sw *ds;
 	struct scatterlist *sg;
-	int num = sglen, i;
 	dma_addr_t addr;
+	int num, i;
 
 	if (!sgl)
 		return NULL;
@@ -1173,12 +1173,7 @@ ldma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	if (d->ver > DMA_VER22)
 		return ldma_chan_desc_cfg(chan, sgl->dma_address, sglen);
 
-	for_each_sg(sgl, sg, sglen, i) {
-		avail = sg_dma_len(sg);
-		if (avail > DMA_MAX_SIZE)
-			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
-	}
-
+	num = sg_nents_for_dma(sgl, sg_len, DMA_MAX_SIZE);
 	ds = dma_alloc_desc_resource(num, c);
 	if (!ds)
 		return NULL;
-- 
2.50.1