linux-kernel - [PATCH] net: ethernet: sun4i-emac: Fix an error handling path in emac

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Message-Id: <aa2344da574f58aeba869a9219b3549dbd65d8e4.1642250684.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 15 Jan 2022 13:45:03 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Conley Lee <conleylee@...mail.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev
Subject: [PATCH] net: ethernet: sun4i-emac: Fix an error handling path in emac_probe()

A dma_request_chan() call is hidden in emac_configure_dma().
It must be released in the probe if an error occurs, as already done in
the remove function.

Add the corresponding dma_release_channel() call.

Fixes: 47869e82c8b8 ("sun4i-emac.c: add dma support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 74635a6fa8ca..621ce742ad21 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -1072,6 +1072,7 @@ static int emac_probe(struct platform_device *pdev)
 	clk_disable_unprepare(db->clk);
 out_dispose_mapping:
 	irq_dispose_mapping(ndev->irq);
+	dma_release_channel(db->rx_chan);
 out_iounmap:
 	iounmap(db->membase);
 out:
-- 
2.32.0