diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2021-01-28 10:10:47 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-02-02 00:16:57 +0100 |
| commit | 7456fea589c6ad3422b0c188871ae80e1d307737 (patch) | |
| tree | c5dc9fe6cad82a8e61f3036a964f91217957e696 /drivers/i3c | |
| parent | 9d909f1b1e91b4aa7d016ed14b7b76dbf2675414 (diff) | |
| download | linux-7456fea589c6ad3422b0c188871ae80e1d307737.tar.bz2 | |
i3c: Handle drivers without probe or remove callback
A registered driver without a probe callback doesn't make sense, so
refuse to register such a driver. (Otherwise i3c_device_probe() yields a
NULL pointer exception.)
A driver without remove is possible, e.g. when all resources are freed
using devm callbacks. So guard the call to driver->remove by a check
for being non-NULL.
Note that the only in-tree i3c driver
(drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c) doesn't have a remove
callback.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210128091048.17006-1-u.kleine-koenig@pengutronix.de
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/device.c | 5 | ||||
| -rw-r--r-- | drivers/i3c/master.c | 10 |
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c index bb8e60dff988..e92d3e9a52bd 100644 --- a/drivers/i3c/device.c +++ b/drivers/i3c/device.c @@ -262,6 +262,11 @@ int i3c_driver_register_with_owner(struct i3c_driver *drv, struct module *owner) drv->driver.owner = owner; drv->driver.bus = &i3c_bus_type; + if (!drv->probe) { + pr_err("Trying to register an i3c driver without probe callback\n"); + return -EINVAL; + } + return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(i3c_driver_register_with_owner); diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index b61bf53ec07a..57a4f699eb8d 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -326,11 +326,13 @@ static int i3c_device_remove(struct device *dev) { struct i3c_device *i3cdev = dev_to_i3cdev(dev); struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); - int ret; + int ret = 0; - ret = driver->remove(i3cdev); - if (ret) - return ret; + if (driver->remove) { + ret = driver->remove(i3cdev); + if (ret) + return ret; + } i3c_device_free_ibi(i3cdev); |