[PATCH v3 1/2] i2c: imx: Clear slave pointer on registration error

[Liem <liem16213@gmail.com>]

In i2c_imx_reg_slave(), i2c_imx->slave is checked at the beginning
and the function returns -EBUSY if it is non-NULL.  If
pm_runtime_resume_and_get() fails later, the error path returns
without clearing i2c_imx->slave, leaving it non-NULL.  Subsequent
attempts to register a slave will then immediately fail with
-EBUSY, making it impossible to register the slave again.

Fix by setting i2c_imx->slave = NULL on the error path.

Fixes: f7414cd6923f ("i2c: imx: support slave mode for imx I2C driver")
Cc: stable@vger.kernel.org
Signed-off-by: Liem <liem16213@gmail.com>
---
 drivers/i2c/busses/i2c-imx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 28313d0fad37..17defb470776 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -936,6 +936,7 @@ static int i2c_imx_reg_slave(struct i2c_client *client)
 	/* Resume */
 	ret = pm_runtime_resume_and_get(i2c_imx->adapter.dev.parent);
 	if (ret < 0) {
+		i2c_imx->slave = NULL;
 		dev_err(&i2c_imx->adapter.dev, "failed to resume i2c controller");
 		return ret;
 	}
-- 
2.34.1