diff mbox series

[v9,1/5] soc: qcom: pdr: protect locator_addr with the main mutex

Message ID 20240622-qcom-pd-mapper-v9-1-a84ee3591c8e@linaro.org (mailing list archive)
State Accepted
Headers show
Series soc: qcom: add in-kernel pd-mapper implementation | expand

Commit Message

Dmitry Baryshkov June 21, 2024, 10:03 p.m. UTC 
If the service locator server is restarted fast enough, the PDR can
rewrite locator_addr fields concurrently. Protect them by placing
modification of those fields under the main pdr->lock.

Fixes: fbe639b44a82 ("soc: qcom: Introduce Protection Domain Restart helpers")
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Steev Klimaszewski <steev@kali.org>
Tested-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/soc/qcom/pdr_interface.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Chris Lew June 25, 2024, 12:52 a.m. UTC | #1 
On 6/21/2024 3:03 PM, Dmitry Baryshkov wrote:
> If the service locator server is restarted fast enough, the PDR can
> rewrite locator_addr fields concurrently. Protect them by placing
> modification of those fields under the main pdr->lock.
> 
> Fixes: fbe639b44a82 ("soc: qcom: Introduce Protection Domain Restart helpers")
> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
> Tested-by: Steev Klimaszewski <steev@kali.org>
> Tested-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Reviewed-by: Chris Lew <quic_clew@quicinc.com>
diff mbox series

Patch

diff --git a/drivers/soc/qcom/pdr_interface.c b/drivers/soc/qcom/pdr_interface.c
index a1b6a4081dea..76a62c2ecc58 100644
--- a/drivers/soc/qcom/pdr_interface.c
+++ b/drivers/soc/qcom/pdr_interface.c
@@ -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 = {
@@ -365,12 +365,14 @@  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,
 			       SERVREG_GET_DOMAIN_LIST_REQ_MAX_LEN,
 			       servreg_get_domain_list_req_ei,
 			       req);
+	mutex_unlock(&pdr->lock);
 	if (ret < 0) {
 		qmi_txn_cancel(&txn);
 		return ret;