linux-kernel - Re: [PATCH v2 2/5] interconnect: qcom: qcs404: Walk the list safely on node removal

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Message-ID: <20191202173721.GC133384@yoga>
Date:   Mon, 2 Dec 2019 09:37:21 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Georgi Djakov <georgi.djakov@...aro.org>
Cc:     linux-pm@...r.kernel.org, agross@...nel.org, digetx@...il.com,
        evgreen@...omium.org, daidavid1@...eaurora.org,
        masneyb@...tation.org, sibis@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/5] interconnect: qcom: qcs404: Walk the list safely
 on node removal

On Mon 02 Dec 08:21 PST 2019, Georgi Djakov wrote:

> As we will remove items off the list using list_del(), we need to use the
> safe version of list_for_each_entry().
> 
> Fixes: 5e4e6c4d3ae0 ("interconnect: qcom: Add QCS404 interconnect provider driver")
> Reported-by: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/interconnect/qcom/qcs404.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/interconnect/qcom/qcs404.c b/drivers/interconnect/qcom/qcs404.c
> index 5e5843e6bd06..9064f6bdaa69 100644
> --- a/drivers/interconnect/qcom/qcs404.c
> +++ b/drivers/interconnect/qcom/qcs404.c
> @@ -405,7 +405,7 @@ static int qnoc_probe(struct platform_device *pdev)
>  	struct icc_provider *provider;
>  	struct qcom_icc_node **qnodes;
>  	struct qcom_icc_provider *qp;
> -	struct icc_node *node;
> +	struct icc_node *node, *tmp;
>  	size_t num_nodes, i;
>  	int ret;
>  
> @@ -485,7 +485,7 @@ static int qnoc_probe(struct platform_device *pdev)
>  
>  	return 0;
>  err:
> -	list_for_each_entry(node, &provider->nodes, node_list) {
> +	list_for_each_entry_safe(node, tmp, &provider->nodes, node_list) {
>  		icc_node_del(node);
>  		icc_node_destroy(node->id);
>  	}
> @@ -499,9 +499,9 @@ static int qnoc_remove(struct platform_device *pdev)
>  {
>  	struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
>  	struct icc_provider *provider = &qp->provider;
> -	struct icc_node *n;
> +	struct icc_node *n, *tmp;
>  
> -	list_for_each_entry(n, &provider->nodes, node_list) {
> +	list_for_each_entry_safe(n, tmp, &provider->nodes, node_list) {
>  		icc_node_del(n);
>  		icc_node_destroy(n->id);
>  	}