dmaengine: imx-sdma: Fix a possible memory leak in sdma_transfer_init

[ Upstream commit 1417f59ac0b02130ee56c0c50794b9b257be3d17 ]

If the function sdma_load_context() fails, the sdma_desc will be
freed, but the allocated desc->bd is forgot to be freed.

We already met the sdma_load_context() failure case and the log as
below:
[ 450.699064] imx-sdma 30bd0000.dma-controller: Timeout waiting for CH0 ready
...

In this case, the desc->bd will not be freed without this change.

Signed-off-by: Hui Wang <hui.wang@canonical.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20221130090800.102035-1-hui.wang@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index fbea5f6..b926abe 100644 (file)
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1521,10 +1521,12 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
                sdma_config_ownership(sdmac, false, true, false);
 
        if (sdma_load_context(sdmac))
-               goto err_desc_out;
+               goto err_bd_out;
 
        return desc;
 
+err_bd_out:
+       sdma_free_bd(desc);
 err_desc_out:
        kfree(desc);
 err_out: