From: Jeremy Kerr jk@ozlabs.org
[ Upstream commit 371975b0b07520c85098652d561639837a60a905 ]
Change d1dcd67825 re-worked the struct fsi_slave initialisation in fsi_slave_init, but introduced a few inconsitencies: the slave->dev is now registered through cdev_device_add, but we may kfree() the device out from underneath the cdev registration. We may also leave an IDA allocated.
This change fixes the error paths, so that we kfree() only before the device is registered with the core code. We also move the smode write to before we start creating proper devices, as it's the most likely to fail. We also remove the IDA-allocated minor on error, and properly clean up the of_node.
Fixes: d1dcd6782576 ("fsi: Add cfam char devices") Reported-by: Lei YU mine260309@gmail.com Tested-by: John Wang wangzqbj@inspur.com Signed-off-by: Jeremy Kerr jk@ozlabs.org Signed-off-by: Joel Stanley joel@jms.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/fsi/fsi-core.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index c6fa9b393e84..bd62236d3f97 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -1060,6 +1060,14 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
}
+ rc = fsi_slave_set_smode(slave); + if (rc) { + dev_warn(&master->dev, + "can't set smode on slave:%02x:%02x %d\n", + link, id, rc); + goto err_free; + } + /* Allocate a minor in the FSI space */ rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt, &slave->cdev_idx); @@ -1071,17 +1079,14 @@ 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; + goto err_free_ida; }
- rc = fsi_slave_set_smode(slave); - if (rc) { - dev_warn(&master->dev, - "can't set smode on slave:%02x:%02x %d\n", - link, id, rc); - kfree(slave); - return -ENODEV; - } + /* Now that we have the cdev registered with the core, any fatal + * failures beyond this point will need to clean up through + * cdev_device_del(). Fortunately though, nothing past here is fatal. + */ + if (master->link_config) master->link_config(master, link, slave->t_send_delay, @@ -1098,10 +1103,13 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id) dev_dbg(&master->dev, "failed during slave scan with: %d\n", rc);
- return rc; + return 0;
- err_free: - put_device(&slave->dev); +err_free_ida: + fsi_free_minor(slave->dev.devt); +err_free: + of_node_put(slave->dev.of_node); + kfree(slave); return rc; }