[PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[Miaoqian Lin]

The of_find_compatible_node() function returns a node pointer with
refcount incremented, We should use of_node_put() on it when done
Add the missing of_node_put() to release the refcount.

Fixes: 87e8657ba99c ("PCI: mediatek: Add new method to get shared pcie-cfg base address")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/pci/controller/pcie-mediatek.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index ddfbd4aebdec..be8bd919cb88 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -1008,6 +1008,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
 					   "mediatek,generic-pciecfg");
 	if (cfg_node) {
 		pcie->cfg = syscon_node_to_regmap(cfg_node);
+		of_node_put(cfg_node);
 		if (IS_ERR(pcie->cfg))
 			return PTR_ERR(pcie->cfg);
 	}
-- 
2.17.1

Re: [PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[Miles Chen]

Hi Miaoqian,

> The of_find_compatible_node() function returns a node pointer with
> refcount incremented, We should use of_node_put() on it when done
> Add the missing of_node_put() to release the refcount.
> 
> Fixes: 87e8657ba99c ("PCI: mediatek: Add new method to get shared pcie-cfg base address")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index ddfbd4aebdec..be8bd919cb88 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -1008,6 +1008,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
>  					   "mediatek,generic-pciecfg");
>  	if (cfg_node) {
>  		pcie->cfg = syscon_node_to_regmap(cfg_node);
> +		of_node_put(cfg_node);
>  		if (IS_ERR(pcie->cfg))
>  			return PTR_ERR(pcie->cfg);
>  	}

Thanks for this patch.

Reviewed-by: Miles Chen <miles.chen@mediatek.com>

Thanks,
Miles

Re: [PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[AngeloGioacchino Del Regno]

Il 09/03/22 10:19, Miaoqian Lin ha scritto:
> The of_find_compatible_node() function returns a node pointer with
> refcount incremented, We should use of_node_put() on it when done
> Add the missing of_node_put() to release the refcount.
> 
> Fixes: 87e8657ba99c ("PCI: mediatek: Add new method to get shared pcie-cfg base address")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> Reviewed-by: Miles Chen <miles.chen@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
>   drivers/pci/controller/pcie-mediatek.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index ddfbd4aebdec..be8bd919cb88 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -1008,6 +1008,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
>   					   "mediatek,generic-pciecfg");
>   	if (cfg_node) {
>   		pcie->cfg = syscon_node_to_regmap(cfg_node);
> +		of_node_put(cfg_node);
>   		if (IS_ERR(pcie->cfg))
>   			return PTR_ERR(pcie->cfg);
>   	}
> 

Re: [PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[Rob Herring]

On Wed, Mar 09, 2022 at 09:19:52AM +0000, Miaoqian Lin wrote:
> The of_find_compatible_node() function returns a node pointer with
> refcount incremented, We should use of_node_put() on it when done
> Add the missing of_node_put() to release the refcount.
> 
> Fixes: 87e8657ba99c ("PCI: mediatek: Add new method to get shared pcie-cfg base address")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 1 +
>  1 file changed, 1 insertion(+)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup

[Lorenzo Pieralisi]

On Wed, 9 Mar 2022 09:19:52 +0000, Miaoqian Lin wrote:
> The of_find_compatible_node() function returns a node pointer with
> refcount incremented, We should use of_node_put() on it when done
> Add the missing of_node_put() to release the refcount.
> 
> 

Applied to pci/mediatek, thanks!

[1/1] PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup
      https://git.kernel.org/lpieralisi/pci/c/214e0d8fe4

Thanks,
Lorenzo