linux-kernel - [PATCH 4/6] usb: chipidea: Fix return value handling

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Date:   Tue, 24 Aug 2021 22:46:16 +0530
From:   Manish Narani <manish.narani@...inx.com>
To:     <peter.chen@...nel.org>, <gregkh@...uxfoundation.org>,
        <michal.simek@...inx.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <git@...inx.com>, Piyush Mehta <piyush.mehta@...inx.com>,
        Manish Narani <manish.narani@...inx.com>
Subject: [PATCH 4/6] usb: chipidea: Fix return value handling

From: Piyush Mehta <piyush.mehta@...inx.com>

API was neither captured nor checked.Fixed it by capturing the
return value and then checking for any error.

Addresses-Coverity: "Calling without checking return"
Addresses-Coverity: "CHECKED_RETURN"
Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
Signed-off-by: Manish Narani <manish.narani@...inx.com>
---
 drivers/usb/chipidea/core.c | 11 +++++++----
 drivers/usb/chipidea/otg.c  |  6 +++++-
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 2b18f50..676346f 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -700,13 +700,16 @@ static int ci_get_platdata(struct device *dev,
 	if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 		platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 
-	of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
-				     &platdata->phy_clkgate_delay_us);
+	if (of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
+				 &platdata->phy_clkgate_delay_us))
+		dev_dbg(dev, "Missing phy-clkgate-delay-us property\n");
 
 	platdata->itc_setting = 1;
 
-	of_property_read_u32(dev->of_node, "itc-setting",
-					&platdata->itc_setting);
+	if (of_property_read_u32(dev->of_node, "itc-setting",
+				 &platdata->itc_setting))
+		dev_dbg(dev, "Missing itc-setting property\n");
+
 
 	ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 				&platdata->ahb_burst_config);
diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index 8dd5928..d527d9d 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -168,6 +168,7 @@ static int hw_wait_vbus_lower_bsv(struct ci_hdrc *ci)
 static void ci_handle_id_switch(struct ci_hdrc *ci)
 {
 	enum ci_role role = ci_otg_role(ci);
+	int ret;
 
 	if (role != ci->role) {
 		dev_dbg(ci->dev, "switching from %s to %s\n",
@@ -193,7 +194,10 @@ static void ci_handle_id_switch(struct ci_hdrc *ci)
 			 */
 			hw_wait_vbus_lower_bsv(ci);
 
-		ci_role_start(ci, role);
+		ret = ci_role_start(ci, role);
+		if (ret < 0)
+			dev_dbg(ci->dev, "switching err %d\n", ret);
+
 		/* vbus change may have already occurred */
 		if (role == CI_ROLE_GADGET)
 			ci_handle_vbus_change(ci);
-- 
2.1.1