From: Saurav Sachidanand <sauravsc@amazon.com>
Date: Thu, 7 May 2026 22:11:44 +0000 (+0000)
Subject: i2c: tegra: fix pm_runtime leak on mutex_lock failure
X-Git-Tag: v7.1-rc5~14^2~1^2~1
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=57cf4e8d6a57dc2ef5810f4852a23ba4c71b74bb;p=thirdparty%2Flinux.git

i2c: tegra: fix pm_runtime leak on mutex_lock failure

If tegra_i2c_mutex_lock() fails, the function returns without calling
pm_runtime_put(), leaking the runtime PM reference acquired by the
preceding pm_runtime_get_sync(). This prevents the device from ever
entering runtime suspend.

Add the missing pm_runtime_put() before returning on lock failure.

Fixes: 6077cfd716fb ("i2c: tegra: Add support for SW mutex register")
Signed-off-by: Saurav Sachidanand <sauravsc@amazon.com>
Cc: <stable@vger.kernel.org> # v7.0+
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260507221145.62183-2-sauravsc@amazon.com
---

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 9fd5ade774a0b..c24b8de0a9c7b 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1666,8 +1666,10 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 	}
 
 	ret = tegra_i2c_mutex_lock(i2c_dev);
-	if (ret)
+	if (ret) {
+		pm_runtime_put(i2c_dev->dev);
 		return ret;
+	}
 
 	for (i = 0; i < num; i++) {
 		enum msg_end_type end_type = MSG_END_STOP;