wil6210: fix PCIe bus mastering in case of interface down

In case of interface down, radio is turned off but PCIe mastering is
not cleared.
This can cause unexpected PCIe access to the shutdown device.
Fix this by clearing PCIe mastering also in case interface is down
Signed-off-by: Lazar Alexei <qca_ailizaro@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/wil6210/pcie_bus.c

@@ -379,6 +379,9 @@ static int wil6210_suspend(struct device *dev, bool is_runtime)
 	int rc = 0;
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct wil6210_priv *wil = pci_get_drvdata(pdev);
+	struct net_device *ndev = wil_to_ndev(wil);
+	bool keep_radio_on = ndev->flags & IFF_UP &&
+			     wil->keep_radio_on_during_sleep;
 
 	wil_dbg_pm(wil, "suspend: %s\n", is_runtime ? "runtime" : "system");
 
@@ -386,14 +389,14 @@ static int wil6210_suspend(struct device *dev, bool is_runtime)
 	if (rc)
 		goto out;
 
-	rc = wil_suspend(wil, is_runtime);
+	rc = wil_suspend(wil, is_runtime, keep_radio_on);
 	if (!rc) {
 		wil->suspend_stats.successful_suspends++;
 
-		/* If platform device supports keep_radio_on_during_sleep
-		 * it will control PCIe master
+		/* In case radio stays on, platform device will control
+		 * PCIe master
 		 */
-		if (!wil->keep_radio_on_during_sleep)
+		if (!keep_radio_on)
 			/* disable bus mastering */
 			pci_clear_master(pdev);
 	}
@@ -406,20 +409,23 @@ static int wil6210_resume(struct device *dev, bool is_runtime)
 	int rc = 0;
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct wil6210_priv *wil = pci_get_drvdata(pdev);
+	struct net_device *ndev = wil_to_ndev(wil);
+	bool keep_radio_on = ndev->flags & IFF_UP &&
+			     wil->keep_radio_on_during_sleep;
 
 	wil_dbg_pm(wil, "resume: %s\n", is_runtime ? "runtime" : "system");
 
-	/* If platform device supports keep_radio_on_during_sleep it will
-	 * control PCIe master
+	/* In case radio stays on, platform device will control
+	 * PCIe master
 	 */
-	if (!wil->keep_radio_on_during_sleep)
+	if (!keep_radio_on)
 		/* allow master */
 		pci_set_master(pdev);
-	rc = wil_resume(wil, is_runtime);
+	rc = wil_resume(wil, is_runtime, keep_radio_on);
 	if (rc) {
 		wil_err(wil, "device failed to resume (%d)\n", rc);
 		wil->suspend_stats.failed_resumes++;
-		if (!wil->keep_radio_on_during_sleep)
+		if (!keep_radio_on)
 			pci_clear_master(pdev);
 	} else {
 		wil->suspend_stats.successful_resumes++;

drivers/net/wireless/ath/wil6210/pm.c

@@ -304,12 +304,9 @@ static int wil_resume_radio_off(struct wil6210_priv *wil)
 	return rc;
 }
 
-int wil_suspend(struct wil6210_priv *wil, bool is_runtime)
+int wil_suspend(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
 {
 	int rc = 0;
-	struct net_device *ndev = wil_to_ndev(wil);
-	bool keep_radio_on = ndev->flags & IFF_UP &&
-			     wil->keep_radio_on_during_sleep;
 
 	wil_dbg_pm(wil, "suspend: %s\n", is_runtime ? "runtime" : "system");
 
@@ -332,12 +329,9 @@ int wil_suspend(struct wil6210_priv *wil, bool is_runtime)
 	return rc;
 }
 
-int wil_resume(struct wil6210_priv *wil, bool is_runtime)
+int wil_resume(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
 {
 	int rc = 0;
-	struct net_device *ndev = wil_to_ndev(wil);
-	bool keep_radio_on = ndev->flags & IFF_UP &&
-			     wil->keep_radio_on_during_sleep;
 	unsigned long long suspend_time_usec = 0;
 
 	wil_dbg_pm(wil, "resume: %s\n", is_runtime ? "runtime" : "system");

drivers/net/wireless/ath/wil6210/wil6210.h

@@ -1016,8 +1016,8 @@ int wil_pm_runtime_get(struct wil6210_priv *wil);
 void wil_pm_runtime_put(struct wil6210_priv *wil);
 
 int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime);
-int wil_suspend(struct wil6210_priv *wil, bool is_runtime);
-int wil_resume(struct wil6210_priv *wil, bool is_runtime);
+int wil_suspend(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on);
+int wil_resume(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on);
 bool wil_is_wmi_idle(struct wil6210_priv *wil);
 int wmi_resume(struct wil6210_priv *wil);
 int wmi_suspend(struct wil6210_priv *wil);