linux-kernel - [PATCH v1 06/10] xhci: dbc: Don't shadow error codes in store() functions

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Message-Id: <20231002161610.2648818-6-andriy.shevchenko@linux.intel.com>
Date:   Mon,  2 Oct 2023 19:16:06 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v1 06/10] xhci: dbc: Don't shadow error codes in store() functions

kstrtox() along with regmap API can return different error codes
based on the circumstances. Don't shadow them when returning to
the caller.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/usb/host/xhci-dbgcap.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index d110eb5f1625..2332133c6581 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -978,9 +978,11 @@ static ssize_t dbc_idVendor_store(struct device *dev,
 	void __iomem		*ptr;
 	u16			value;
 	u32			dev_info;
+	int ret;
 
-	if (kstrtou16(buf, 0, &value))
-		return -EINVAL;
+	ret = kstrtou16(buf, 0, &value);
+	if (ret)
+		return ret;
 
 	xhci = hcd_to_xhci(dev_get_drvdata(dev));
 	dbc = xhci->dbc;
@@ -1018,9 +1020,11 @@ static ssize_t dbc_idProduct_store(struct device *dev,
 	void __iomem		*ptr;
 	u32			dev_info;
 	u16			value;
+	int ret;
 
-	if (kstrtou16(buf, 0, &value))
-		return -EINVAL;
+	ret = kstrtou16(buf, 0, &value);
+	if (ret)
+		return ret;
 
 	xhci = hcd_to_xhci(dev_get_drvdata(dev));
 	dbc = xhci->dbc;
@@ -1057,9 +1061,11 @@ static ssize_t dbc_bcdDevice_store(struct device *dev,
 	void __iomem *ptr;
 	u32 dev_info;
 	u16 value;
+	int ret;
 
-	if (kstrtou16(buf, 0, &value))
-		return -EINVAL;
+	ret = kstrtou16(buf, 0, &value);
+	if (ret)
+		return ret;
 
 	xhci = hcd_to_xhci(dev_get_drvdata(dev));
 	dbc = xhci->dbc;
@@ -1099,9 +1105,13 @@ static ssize_t dbc_bInterfaceProtocol_store(struct device *dev,
 	u8 value;
 	int ret;
 
-	/* bInterfaceProtocol is 8 bit, but xhci only supports values 0 and 1 */
+	/* bInterfaceProtocol is 8 bit, but... */
 	ret = kstrtou8(buf, 0, &value);
-	if (ret || value > 1)
+	if (ret)
+		return ret;
+
+	/* ...xhci only supports values 0 and 1 */
+	if (value > 1)
 		return -EINVAL;
 
 	xhci = hcd_to_xhci(dev_get_drvdata(dev));
-- 
2.40.0.1.gaa8946217a0b