linux-kernel - [PATCH] media: cx25821: Add missing unmap in snd_cx25821_hw

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Message-Id: <20251210024559.50171-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Wed, 10 Dec 2025 10:45:59 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: mchehab@...nel.org,
	lihaoxiang@...c.iscas.ac.cn,
	hans.verkuil@...co.com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] media: cx25821: Add missing unmap in snd_cx25821_hw_params()

In error path, add cx25821_alsa_dma_unmap() to release the
resource acquired by cx25821_alsa_dma_map()

Fixes: b2c75abde0de ("[media] cx88: drop videobuf abuse in cx88-alsa")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
 drivers/media/pci/cx25821/cx25821-alsa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/pci/cx25821/cx25821-alsa.c b/drivers/media/pci/cx25821/cx25821-alsa.c
index a42f0c03a7ca..f463365163b7 100644
--- a/drivers/media/pci/cx25821/cx25821-alsa.c
+++ b/drivers/media/pci/cx25821/cx25821-alsa.c
@@ -535,6 +535,7 @@ static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
 			chip->period_size, chip->num_periods, 1);
 	if (ret < 0) {
 		pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
+		cx25821_alsa_dma_unmap(chip);
 		goto error;
 	}
 
-- 
2.25.1