[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <d9a2004a-0a3b-41a6-92a4-eea7b1b3f804@quicinc.com>
Date: Wed, 5 Jun 2024 15:48:08 -0700
From: Chris Lew <quic_clew@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Bjorn Andersson
<andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Sibi Sankar
<quic_sibis@...cinc.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-remoteproc@...r.kernel.org>,
Johan Hovold <johan+linaro@...nel.org>,
Xilin Wu <wuxilin123@...il.com>,
Bryan O'Donoghue
<bryan.odonoghue@...aro.org>,
Steev Klimaszewski <steev@...i.org>,
"Alexey
Minnekhanov" <alexeymin@...tmarketos.org>,
Neil Armstrong
<neil.armstrong@...aro.org>
Subject: Re: [PATCH v8 1/5] soc: qcom: pdr: protect locator_addr with the main
mutex
Hi Dmitry,
On 5/11/2024 2:56 PM, Dmitry Baryshkov wrote:
...
> @@ -76,12 +76,12 @@ static int pdr_locator_new_server(struct qmi_handle *qmi,
> locator_hdl);
> struct pdr_service *pds;
>
> + mutex_lock(&pdr->lock);
> /* Create a local client port for QMI communication */
> pdr->locator_addr.sq_family = AF_QIPCRTR;
> pdr->locator_addr.sq_node = svc->node;
> pdr->locator_addr.sq_port = svc->port;
>
> - mutex_lock(&pdr->lock);
> pdr->locator_init_complete = true;
> mutex_unlock(&pdr->lock);
>
> @@ -104,10 +104,10 @@ static void pdr_locator_del_server(struct qmi_handle *qmi,
>
> mutex_lock(&pdr->lock);
> pdr->locator_init_complete = false;
> - mutex_unlock(&pdr->lock);
>
> pdr->locator_addr.sq_node = 0;
> pdr->locator_addr.sq_port = 0;
> + mutex_unlock(&pdr->lock);
> }
>
> static const struct qmi_ops pdr_locator_ops = {
> @@ -365,6 +365,7 @@ static int pdr_get_domain_list(struct servreg_get_domain_list_req *req,
> if (ret < 0)
> return ret;
>
> + mutex_lock(&pdr->lock);
> ret = qmi_send_request(&pdr->locator_hdl,
> &pdr->locator_addr,
> &txn, SERVREG_GET_DOMAIN_LIST_REQ,
> @@ -373,15 +374,16 @@ static int pdr_get_domain_list(struct servreg_get_domain_list_req *req,
> req);
> if (ret < 0) {
> qmi_txn_cancel(&txn);
> - return ret;
> + goto err_unlock;
> }
>
> ret = qmi_txn_wait(&txn, 5 * HZ);
> if (ret < 0) {
> pr_err("PDR: %s get domain list txn wait failed: %d\n",
> req->service_name, ret);
> - return ret;
> + goto err_unlock;
> }
> + mutex_unlock(&pdr->lock);
I'm not sure it is necessary to hold the the mutex during the
qmi_txn_wait() since the only variable we are trying to protect is
locator_addr.
Wouldn't this delay other work like new/del server notifications if this
qmi service is delayed or non-responsive?
Thanks,
Chris
>
> if (resp->resp.result != QMI_RESULT_SUCCESS_V01) {
> pr_err("PDR: %s get domain list failed: 0x%x\n",
> @@ -390,6 +392,11 @@ static int pdr_get_domain_list(struct servreg_get_domain_list_req *req,
> }
>
> return 0;
> +
> +err_unlock:
> + mutex_unlock(&pdr->lock);
> +
> + return ret;
> }
>
Powered by blists - more mailing lists