linux-kernel - [PATCH RFC] dmaengine: ti: k3-udma: Use cap_mask directly from dma

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Message-ID: <20250117121728.203452-1-y-abhilashchandra@ti.com>
Date: Fri, 17 Jan 2025 17:47:28 +0530
From: Yemike Abhilash Chandra <y-abhilashchandra@...com>
To: <peter.ujfalusi@...il.com>, <vkoul@...nel.org>
CC: <vaishnav.a@...com>, <u-kumar1@...com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <y-abhilashchandra@...com>
Subject: [PATCH RFC] dmaengine: ti: k3-udma: Use cap_mask directly from dma_device structure instead of a local copy

Currently, a local dma_cap_mask_t variable is used to store device
cap_mask within udma_of_xlate(). However, the DMA_PRIVATE flag in
the device cap_mask can get cleared when the last channel is released.
This can happen right after storing the cap_mask locally in
udma_of_xlate() and subsequent dma_request_channel() can fail due to
mismatch in the cap_mask. Fix this by removing the local dma_cap_mask_t
variable and directly using the one from the dma_device structure.

Signed-off-by: Vaishnav Achath <vaishnav.a@...com>
Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
---
 drivers/dma/ti/k3-udma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 7ed1956b4642..c775a2284e86 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -4246,7 +4246,6 @@ static struct dma_chan *udma_of_xlate(struct of_phandle_args *dma_spec,
 				      struct of_dma *ofdma)
 {
 	struct udma_dev *ud = ofdma->of_dma_data;
-	dma_cap_mask_t mask = ud->ddev.cap_mask;
 	struct udma_filter_param filter_param;
 	struct dma_chan *chan;
 
@@ -4278,7 +4277,7 @@ static struct dma_chan *udma_of_xlate(struct of_phandle_args *dma_spec,
 		}
 	}
 
-	chan = __dma_request_channel(&mask, udma_dma_filter_fn, &filter_param,
+	chan = __dma_request_channel(&ud->ddev.cap_mask, udma_dma_filter_fn, &filter_param,
 				     ofdma->of_node);
 	if (!chan) {
 		dev_err(ud->dev, "get channel fail in %s.\n", __func__);
-- 
2.34.1