dmaengine: fsl-edma: Fix clk leak on alloc_chan_resources failure

[ Upstream commit b18cd8b ]

When fsl_edma_alloc_chan_resources() fails after clk_prepare_enable(),
the error paths only free IRQs and destroy the TCD pool, but forget to
call clk_disable_unprepare(). This causes the channel clock to remain
enabled, leaking power and resources.

Fix it by disabling the channel clock in the error unwind path.

Fixes: d8d4355 ("dmaengine: fsl-edma: add i.MX8ULP edma support")
Cc: stable@vger.kernel.org
Suggested-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251014090522.827726-1-zhen.ni@easystack.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>
[ Different error handling scheme ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: nizhen-t

drivers/dma/fsl-edma-common.c

@@ -819,6 +819,7 @@ int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 
 		if (ret) {
 			dma_pool_destroy(fsl_chan->tcd_pool);
+			clk_disable_unprepare(fsl_chan->clk);
 			return ret;
 		}
 	}