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Subject[PATCH 4.4 098/190] dmaengine: imx-sdma: Handle return value of clk_prepare_enable
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arvind Yadav <arvind.yadav.cs@gmail.com>


[ Upstream commit fb9caf370f4d0457789d13a1a1b110a8db846e5e ]

clk_prepare_enable() can fail here and we must check its return value.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dma/imx-sdma.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)

--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1722,17 +1722,24 @@ static int sdma_probe(struct platform_de
if (IS_ERR(sdma->clk_ahb))
return PTR_ERR(sdma->clk_ahb);

- clk_prepare(sdma->clk_ipg);
- clk_prepare(sdma->clk_ahb);
+ ret = clk_prepare(sdma->clk_ipg);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare(sdma->clk_ahb);
+ if (ret)
+ goto err_clk;

ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma",
sdma);
if (ret)
- return ret;
+ goto err_irq;

sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
- if (!sdma->script_addrs)
- return -ENOMEM;
+ if (!sdma->script_addrs) {
+ ret = -ENOMEM;
+ goto err_irq;
+ }

/* initially no scripts available */
saddr_arr = (s32 *)sdma->script_addrs;
@@ -1847,6 +1854,10 @@ err_register:
dma_async_device_unregister(&sdma->dma_device);
err_init:
kfree(sdma->script_addrs);
+err_irq:
+ clk_unprepare(sdma->clk_ahb);
+err_clk:
+ clk_unprepare(sdma->clk_ipg);
return ret;
}

@@ -1857,6 +1868,8 @@ static int sdma_remove(struct platform_d

dma_async_device_unregister(&sdma->dma_device);
kfree(sdma->script_addrs);
+ clk_unprepare(sdma->clk_ahb);
+ clk_unprepare(sdma->clk_ipg);
/* Kill the tasklet */
for (i = 0; i < MAX_DMA_CHANNELS; i++) {
struct sdma_channel *sdmac = &sdma->channel[i];

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