[PATCH] gpu: ipu-pre: handle clock enable failures

[Jiawen Liu]

Check clock-enable failures after a manually managed allocation.

Release the earlier allocation and return the original clock error when
probe cannot enable the clock.

Signed-off-by: jiawen <1298662...@qq.com>
---
diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c
--- a/drivers/gpu/ipu-v3/ipu-pre.c
+++ b/drivers/gpu/ipu-v3/ipu-pre.c
@@ -311,6 +311,7 @@
 {
        struct device *dev = &pdev->dev;
        struct ipu_pre *pre;
+       int ret;
 
        pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
        if (!pre)
@@ -339,7 +340,12 @@
        if (!pre->buffer_virt)
                return -ENOMEM;
 
-       clk_prepare_enable(pre->clk_axi);
+       ret = clk_prepare_enable(pre->clk_axi);
+       if (ret) {
+               gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
+                             IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
+               return ret;
+       }
 
        pre->dev = dev;
        platform_set_drvdata(pdev, pre);