linux-kernel - [PATCH v2] dmaengine: ti: k3-udma-glue: Fix of_k3_udma_glue_parse_chn_by

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Date: Sun, 2 Jun 2024 07:03:19 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <peter.ujfalusi@...il.com>, <vkoul@...nel.org>, <Markus.Elfring@....de>
CC: <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH v2] dmaengine: ti: k3-udma-glue: Fix of_k3_udma_glue_parse_chn_by_id()

The of_k3_udma_glue_parse_chn_by_id() helper function erroneously
invokes "of_node_put()" on the "udmax_np" device-node passed to it,
without having incremented its reference count at any point. Fix it.

Fixes: 81a1f90f20af ("dmaengine: ti: k3-udma-glue: Add function to parse channel by ID")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
---

Hello,

This patch is based on commit
83814698cf48 Merge tag 'powerpc-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
of Mainline Linux.

v1 of this patch is at:
https://lore.kernel.org/r/20240518100556.2551788-1-s-vadapalli@ti.com/
Changes since v1:
- Rebased patch on latest Mainline Linux.
- Collected "Acked-by" tag from Peter Ujfalusi <peter.ujfalusi@...il.com>
  from:
  https://lore.kernel.org/r/8b2e4b7f-50ae-4017-adf2-2e990cd45a25@gmail.com/
- Updated commit message based on feedback from
  Markus Elfring <Markus.Elfring@....de> at:
  https://lore.kernel.org/r/22a66571-0a0c-46dd-899a-d24079372880@web.de/
  with the change being:
  s/..incremented its reference at../..incremented its reference count at../

Regards,
Siddharth.

 drivers/dma/ti/k3-udma-glue.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c
index c9b93055dc9d..f0a399cf45b2 100644
--- a/drivers/dma/ti/k3-udma-glue.c
+++ b/drivers/dma/ti/k3-udma-glue.c
@@ -200,12 +200,9 @@ of_k3_udma_glue_parse_chn_by_id(struct device_node *udmax_np, struct k3_udma_glu
 
 	ret = of_k3_udma_glue_parse(udmax_np, common);
 	if (ret)
-		goto out_put_spec;
+		return ret;
 
 	ret = of_k3_udma_glue_parse_chn_common(common, thread_id, tx_chn);
-
-out_put_spec:
-	of_node_put(udmax_np);
 	return ret;
 }
 
-- 
2.40.1