phy: tegra: xusb: Fix NULL vs IS_ERR_OR_NULL checking

Commit Message

Miaoqian Lin Dec. 12, 2021, 6:50 a.m. UTC

The tegra_xusb_find_port_node() function may return error pointer when
kasprintf() return NULL. Using IS_ERR_OR_NULL to check the return value
of tegra_xusb_find_port_node() to catch this.

Signed-off-by: Miaoqian Lin <[e-mail]>
---
 drivers/phy/tegra/xusb.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Comments

Dmitry Osipenko Dec. 12, 2021, 2:31 p.m. UTC | #1

12.12.2021 09:50, Miaoqian Lin пишет:
> The tegra_xusb_find_port_node() function may return error pointer when
> kasprintf() return NULL. Using IS_ERR_OR_NULL to check the return value
> of tegra_xusb_find_port_node() to catch this.
> 
> Signed-off-by: Miaoqian Lin <[e-mail]>
> ---
>  drivers/phy/tegra/xusb.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)

Instead of changing the 6 lines and making code less readable, you could
change a single line.

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 963de5913e50..aa5237eacd29 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -455,7 +455,7 @@ tegra_xusb_find_port_node(struct tegra_xusb_padctl
*padctl, const char *type,
        name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
        if (!name) {
                of_node_put(ports);
-               return ERR_PTR(-ENOMEM);
+               return NULL;
        }
        np = of_get_child_by_name(ports, name);
        kfree(name);

Patch

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 963de5913e50..52c2f85c67c3 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -472,7 +472,7 @@  tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
 	struct device_node *np;
 
 	np = tegra_xusb_find_port_node(padctl, type, index);
-	if (!np)
+	if (IS_ERR_OR_NULL(np))
 		return NULL;
 
 	list_for_each_entry(port, &padctl->ports, list) {
@@ -763,7 +763,7 @@  static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
 	 * marked as disabled there is no reason to register it.
 	 */
 	np = tegra_xusb_find_port_node(padctl, "usb2", index);
-	if (!np || !of_device_is_available(np))
+	if (IS_ERR_OR_NULL(np) || !of_device_is_available(np))
 		goto out;
 
 	usb2 = kzalloc(sizeof(*usb2), GFP_KERNEL);
@@ -829,7 +829,7 @@  static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
 	int err = 0;
 
 	np = tegra_xusb_find_port_node(padctl, "ulpi", index);
-	if (!np || !of_device_is_available(np))
+	if (IS_ERR_OR_NULL(np) || !of_device_is_available(np))
 		goto out;
 
 	ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL);
@@ -884,7 +884,7 @@  static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
 	int err = 0;
 
 	np = tegra_xusb_find_port_node(padctl, "hsic", index);
-	if (!np || !of_device_is_available(np))
+	if (IS_ERR_OR_NULL(np) || !of_device_is_available(np))
 		goto out;
 
 	hsic = kzalloc(sizeof(*hsic), GFP_KERNEL);
@@ -970,7 +970,7 @@  static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
 	 * hence return 0 instead of an error to allow ports to be optional.
 	 */
 	np = tegra_xusb_find_port_node(padctl, "usb3", index);
-	if (!np || !of_device_is_available(np))
+	if (IS_ERR_OR_NULL(np) || !of_device_is_available(np))
 		goto out;
 
 	usb3 = kzalloc(sizeof(*usb3), GFP_KERNEL);
@@ -1035,7 +1035,7 @@  static int tegra_xusb_find_unused_usb3_port(struct tegra_xusb_padctl *padctl)
 
 	for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
 		np = tegra_xusb_find_port_node(padctl, "usb3", i);
-		if (!np || !of_device_is_available(np))
+		if (IS_ERR_OR_NULL(np) || !of_device_is_available(np))
 			return i;
 	}