Once cdev_device_add() failed, we should use put_device() to decrement reference count for cleanup. Or it could cause memory leak. Although operations in err_free_ida are similar to the operations in callback function fsi_slave_release(), put_device() is a correct handling operation as comments require when cdev_device_add() fails.
As comment of device_add() says, 'if device_add() succeeds, you should call device_del() when you want to get rid of it. If device_add() has not succeeded, use only put_device() to drop the reference count'.
Found by code review.
Cc: stable@vger.kernel.org Fixes: 371975b0b075 ("fsi/core: Fix error paths on CFAM init") Signed-off-by: Ma Ke make24@iscas.ac.cn --- drivers/fsi/fsi-core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index e2e1e9df6115..1373e05e3659 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -1084,7 +1084,8 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) rc = cdev_device_add(&slave->cdev, &slave->dev); if (rc) { dev_err(&slave->dev, "Error %d creating slave device\n", rc); - goto err_free_ida; + put_device(&slave->dev); + return rc; }
/* Now that we have the cdev registered with the core, any fatal @@ -1110,8 +1111,6 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
return 0;
-err_free_ida: - fsi_free_minor(slave->dev.devt); err_free: of_node_put(slave->dev.of_node); kfree(slave);