From: Saravana Kannan saravanak@google.com
[ Upstream commit c7299fea67696db5bd09d924d1f1080d894f92ef ]
When an SPI device is unregistered, the spi->controller->cleanup() is called in the device's release callback. That's wrong for a couple of reasons:
1. spi_dev_put() can be called before spi_add_device() is called. And it's spi_add_device() that calls spi_setup(). This will cause clean() to get called without the spi device ever being setup.
2. There's no guarantee that the controller's driver would be present by the time the spi device's release function gets called.
3. It also causes "sleeping in atomic context" stack dump[1] when device link deletion code does a put_device() on the spi device.
Fix these issues by simply moving the cleanup from the device release callback to the actual spi_unregister_device() function.
[1] - https://lore.kernel.org/lkml/CAHp75Vc=FCGcUyS0v6fnxme2YJ+qD+Y-hQDQLa2JhWNON9...
Signed-off-by: Saravana Kannan saravanak@google.com Link: https://lore.kernel.org/r/20210426235638.1285530-1-saravanak@google.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index a6f1e94af13c..96560853b3a3 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -47,10 +47,6 @@ static void spidev_release(struct device *dev) { struct spi_device *spi = to_spi_device(dev);
- /* spi controllers may cleanup for released devices */ - if (spi->controller->cleanup) - spi->controller->cleanup(spi); - spi_controller_put(spi->controller); kfree(spi->driver_override); kfree(spi); @@ -550,6 +546,12 @@ static int spi_dev_check(struct device *dev, void *data) return 0; }
+static void spi_cleanup(struct spi_device *spi) +{ + if (spi->controller->cleanup) + spi->controller->cleanup(spi); +} + /** * spi_add_device - Add spi_device allocated with spi_alloc_device * @spi: spi_device to register @@ -614,11 +616,13 @@ int spi_add_device(struct spi_device *spi)
/* Device may be bound to an active driver when this returns */ status = device_add(&spi->dev); - if (status < 0) + if (status < 0) { dev_err(dev, "can't add %s, status %d\n", dev_name(&spi->dev), status); - else + spi_cleanup(spi); + } else { dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev)); + }
done: mutex_unlock(&spi_add_lock); @@ -705,6 +709,8 @@ void spi_unregister_device(struct spi_device *spi) if (!spi) return;
+ spi_cleanup(spi); + if (spi->dev.of_node) { of_node_clear_flag(spi->dev.of_node, OF_POPULATED); of_node_put(spi->dev.of_node);