linux-kernel - [PATCH 5.16 183/227] i2c: qcom-cci: dont delete an unregistered adapter

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Message-Id: <20220221084940.903673948@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:50:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Wolfram Sang <wsa@...nel.org>
Subject: [PATCH 5.16 183/227] i2c: qcom-cci: dont delete an unregistered adapter

From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>

commit a0d48505a1d68e27220369e2dd1e3573a2f362d2 upstream.

If i2c_add_adapter() fails to add an I2C adapter found on QCOM CCI
controller, on error path i2c_del_adapter() is still called.

Fortunately there is a sanity check in the I2C core, so the only
visible implication is a printed debug level message:

    i2c-core: attempting to delete unregistered adapter [Qualcomm-CCI]

Nevertheless it would be reasonable to correct the probe error path.

Fixes: e517526195de ("i2c: Add Qualcomm CCI I2C driver")
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
Reviewed-by: Robert Foss <robert.foss@...aro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/i2c/busses/i2c-qcom-cci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-qcom-cci.c
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -655,7 +655,7 @@ static int cci_probe(struct platform_dev
 	return 0;
 
 error_i2c:
-	for (; i >= 0; i--) {
+	for (--i ; i >= 0; i--) {
 		if (cci->master[i].cci)
 			i2c_del_adapter(&cci->master[i].adap);
 	}