linux-kernel - [PATCH v2 1/3] dmaengine: altera-msgdma: use irq variant of spin

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Message-ID: <20240608213216.25087-1-olivierdautricourt@gmail.com>
Date: Sat,  8 Jun 2024 23:31:46 +0200
From: Olivier Dautricourt <olivierdautricourt@...il.com>
To: Stefan Roese <sr@...x.de>,
	Vinod Koul <vkoul@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org,
	Eric Schwarz <eas@...optimization.com>,
	Olivier Dautricourt <olivierdautricourt@...il.com>
Subject: [PATCH v2 1/3] dmaengine: altera-msgdma: use irq variant of spin_lock/unlock while invoking callbacks

As we first take the lock with spin_lock_irqsave in msgdma_tasklet, Lockdep
might complain about this. Inspired by commit 9558cf4ad07e
("dmaengine: zynqmp_dma: fix lockdep warning in tasklet")

Signed-off-by: Olivier Dautricourt <olivierdautricourt@...il.com>
Tested-by: Olivier Dautricourt <olivierdautricourt@...il.com>
Suggested-by: Eric Schwarz <eas@...optimization.com>
---
 drivers/dma/altera-msgdma.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c
index a8e3615235b8..160a465b06dd 100644
--- a/drivers/dma/altera-msgdma.c
+++ b/drivers/dma/altera-msgdma.c
@@ -583,6 +583,7 @@ static void msgdma_issue_pending(struct dma_chan *chan)
 static void msgdma_chan_desc_cleanup(struct msgdma_device *mdev)
 {
 	struct msgdma_sw_desc *desc, *next;
+	unsigned long irqflags;
 
 	list_for_each_entry_safe(desc, next, &mdev->done_list, node) {
 		struct dmaengine_desc_callback cb;
@@ -591,9 +592,9 @@ static void msgdma_chan_desc_cleanup(struct msgdma_device *mdev)
 
 		dmaengine_desc_get_callback(&desc->async_tx, &cb);
 		if (dmaengine_desc_callback_valid(&cb)) {
-			spin_unlock(&mdev->lock);
+			spin_unlock_irqrestore(&mdev->lock, irqflags);
 			dmaengine_desc_callback_invoke(&cb, NULL);
-			spin_lock(&mdev->lock);
+			spin_lock_irqsave(&mdev->lock, irqflags);
 		}
 
 		/* Run any dependencies, then free the descriptor */
-- 
2.45.0