linux-kernel - [PATCH] usb: dwc3: Fix an IS_ERR() vs NULL check in dwc3_power_off_all_roothub

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Date: Wed, 31 Jan 2024 10:10:27 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Ran Wang <ran.wang_1@....com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Chen <peter.chen@....com>, Frank Li <Frank.Li@....com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] usb: dwc3: Fix an IS_ERR() vs NULL check in
 dwc3_power_off_all_roothub_ports()

The ioremap() function doesn't return error pointers, it returns NULL on
error.  Update the check.

Fixes: 2d2a3349521d ("usb: dwc3: Add workaround for host mode VBUS glitch when boot")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/usb/dwc3/host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index ae189b7a4f8b..4e6239d3a0ac 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -35,7 +35,7 @@ static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc)
 	/* xhci regs is not mapped yet, do it temperary here */
 	if (dwc->xhci_resources[0].start) {
 		xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
-		if (IS_ERR(xhci_regs)) {
+		if (!xhci_regs) {
 			dev_err(dwc->dev, "Failed to ioremap xhci_regs\n");
 			return;
 		}
-- 
2.43.0