linux-kernel - [PATCH] i2c: mv64xxx: Fix check for missing clock

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Date:   Mon,  8 Feb 2021 00:19:22 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Samuel Holland <samuel@...lland.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] i2c: mv64xxx: Fix check for missing clock

In commit e5c02cf54154 ("i2c: mv64xxx: Add runtime PM support"), error
pointers to optional clocks were replaced by NULL to simplify the resume
callback implementation. However, that commit missed that the IS_ERR
check in mv64xxx_of_config should be replaced with a NULL check. As a
result, the check always passes, even for an invalid device tree.

Fixes: e5c02cf54154 ("i2c: mv64xxx: Add runtime PM support")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 drivers/i2c/busses/i2c-mv64xxx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index b03c344323d1..c590d36b5fd1 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -813,7 +813,7 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
 	 * need to know tclk in order to calculate bus clock
 	 * factors.
 	 */
-	if (IS_ERR(drv_data->clk)) {
+	if (!drv_data->clk) {
 		rc = -ENODEV;
 		goto out;
 	}
-- 
2.26.2