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drm/rockchip: driver: fix sub_dev pointer error

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the sub_dev will be update by list_for_each_entry() and return !NULL
error pointer when no found subdev;

Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Change-Id: I8d7db3b66c6c57b986a42cac9ed6eca53b72611e
This commit is contained in:
Sandy Huang
2021-07-01 10:30:05 +08:00
committed by Huang Jiachai
parent 89d6a276b6
commit 8c8f462197
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
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@@ -122,15 +122,18 @@ EXPORT_SYMBOL(rockchip_drm_unregister_sub_dev);
struct rockchip_drm_sub_dev *rockchip_drm_get_sub_dev(struct device_node *node)
{
struct rockchip_drm_sub_dev *sub_dev = NULL;
bool found = false;
mutex_lock(&rockchip_drm_sub_dev_lock);
list_for_each_entry(sub_dev, &rockchip_drm_sub_dev_list, list) {
if (sub_dev->of_node == node)
if (sub_dev->of_node == node) {
found = true;
break;
}
}
mutex_unlock(&rockchip_drm_sub_dev_lock);
return sub_dev;
return found ? sub_dev : NULL;
}
EXPORT_SYMBOL(rockchip_drm_get_sub_dev);