[PATCH 4.9 144/172] spi: fix device-node leaks

Greg Kroah-Hartman
2017-07-03T13:45:43Z

From: Johan Hovold <johan@kernel.org>

commit 8324147f38019865b29d03baf28412d2ec0bd828 upstream.

Make sure to release the device-node reference taken in
of_register_spi_device() on errors and when deregistering the device.

Fixes: 284b01897340 ("spi: Add OF binding support for SPI busses")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -621,8 +621,10 @@ void spi_unregister_device(struct spi_de
if (!spi)
return;

- if (spi->dev.of_node)
+ if (spi->dev.of_node) {
of_node_clear_flag(spi->dev.of_node, OF_POPULATED);
+ of_node_put(spi->dev.of_node);
+ }
if (ACPI_COMPANION(&spi->dev))
acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev));
device_unregister(&spi->dev);
@@ -1589,11 +1591,13 @@ of_register_spi_device(struct spi_master
if (rc) {
dev_err(&master->dev, "spi_device register error %s\n",
nc->full_name);
- goto err_out;
+ goto err_of_node_put;
}

return spi;

+err_of_node_put:
+ of_node_put(nc);
err_out:
spi_dev_put(spi);
return ERR_PTR(rc);