linux-kernel - [PATCH v5 4/6] dmaengine: sh: rz-dmac: Add rz_dmac_invalidate

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Message-ID: <20251217135213.400280-5-claudiu.beznea.uj@bp.renesas.com>
Date: Wed, 17 Dec 2025 15:52:11 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: vkoul@...nel.org,
	fabrizio.castro.jz@...esas.com,
	biju.das.jz@...renesas.com,
	geert+renesas@...der.be,
	prabhakar.mahadev-lad.rj@...renesas.com
Cc: claudiu.beznea@...on.dev,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v5 4/6] dmaengine: sh: rz-dmac: Add rz_dmac_invalidate_lmdesc()

From: Biju Das <biju.das.jz@...renesas.com>

Add rz_dmac_invalidate_lmdesc() so that the same code can be shared
between rz_dmac_terminate_all() and rz_dmac_free_chan_resources().

Based on a patch in the BSP by Long Luu <long.luu.ur@...esas.com>.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
[claudiu.beznea: adjusted the commit description; defined the lmdesc
 inside the for block to have more compact code]
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v5:
- adjusted the commit description
- defined the lmdesc inside the for block

 drivers/dma/sh/rz-dmac.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index ae8a4bd9d7fa..bb5677f5a318 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -250,6 +250,13 @@ static void rz_lmdesc_setup(struct rz_dmac_chan *channel,
  * Descriptors preparation
  */
 
+static void rz_dmac_invalidate_lmdesc(struct rz_dmac_chan *channel)
+{
+	for (struct rz_lmdesc *lmdesc = channel->lmdesc.base;
+	     lmdesc < channel->lmdesc.base + DMAC_NR_LMDESC; lmdesc++)
+		lmdesc->header = 0;
+}
+
 static void rz_dmac_lmdesc_recycle(struct rz_dmac_chan *channel)
 {
 	struct rz_lmdesc *lmdesc = channel->lmdesc.head;
@@ -456,15 +463,12 @@ static void rz_dmac_free_chan_resources(struct dma_chan *chan)
 {
 	struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
 	struct rz_dmac *dmac = to_rz_dmac(chan->device);
-	struct rz_lmdesc *lmdesc = channel->lmdesc.base;
 	struct rz_dmac_desc *desc, *_desc;
 	unsigned long flags;
-	unsigned int i;
 
 	spin_lock_irqsave(&channel->vc.lock, flags);
 
-	for (i = 0; i < DMAC_NR_LMDESC; i++)
-		lmdesc[i].header = 0;
+	rz_dmac_invalidate_lmdesc(channel);
 
 	rz_dmac_disable_hw(channel);
 	list_splice_tail_init(&channel->ld_active, &channel->ld_free);
@@ -556,15 +560,12 @@ rz_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 static int rz_dmac_terminate_all(struct dma_chan *chan)
 {
 	struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
-	struct rz_lmdesc *lmdesc = channel->lmdesc.base;
 	unsigned long flags;
-	unsigned int i;
 	LIST_HEAD(head);
 
 	spin_lock_irqsave(&channel->vc.lock, flags);
 	rz_dmac_disable_hw(channel);
-	for (i = 0; i < DMAC_NR_LMDESC; i++)
-		lmdesc[i].header = 0;
+	rz_dmac_invalidate_lmdesc(channel);
 
 	list_splice_tail_init(&channel->ld_active, &channel->ld_free);
 	list_splice_tail_init(&channel->ld_queue, &channel->ld_free);
-- 
2.43.0