linux-kernel - [PATCH][next] i2c: microchip: pci1xxxx: Fix comparison of -EPERM against an unsigned variable

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Message-Id: <20221004192715.173210-1-colin.i.king@gmail.com>
Date:   Tue,  4 Oct 2022 20:27:15 +0100
From:   Colin Ian King <colin.i.king@...il.com>
To:     Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
        Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] i2c: microchip: pci1xxxx: Fix comparison of -EPERM against an unsigned variable

The comparison of variable ret with -EPERM is always false because
ret is an u8 type. Fix this by making ret an int.

Cleans up clang warning:
drivers/i2c/busses/i2c-mchp-pci1xxxx.c:714:10: warning: result of comparison
of constant -1 with expression of type 'u8' (aka 'unsigned char') is always
false [-Wtautological-constant-out-of-range-compare]

Fixes: 361693697249 ("i2c: microchip: pci1xxxx: Add driver for I2C host controller in multifunction endpoint of pci1xxxx switch")
Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 drivers/i2c/busses/i2c-mchp-pci1xxxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-mchp-pci1xxxx.c b/drivers/i2c/busses/i2c-mchp-pci1xxxx.c
index f5342201eb6b..09af75921147 100644
--- a/drivers/i2c/busses/i2c-mchp-pci1xxxx.c
+++ b/drivers/i2c/busses/i2c-mchp-pci1xxxx.c
@@ -708,7 +708,7 @@ static void pci1xxxx_i2c_init(struct pci1xxxx_i2c *i2c)
 	void __iomem *p2 = i2c->i2c_base + SMBUS_STATUS_REG_OFF;
 	void __iomem *p1 = i2c->i2c_base + SMB_GPR_REG;
 	u8 regval;
-	u8 ret;
+	int ret;
 
 	ret = set_sys_lock(i2c);
 	if (ret == -EPERM) {
-- 
2.37.1