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

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Message-Id: <20170703133421.073424548@linuxfoundation.org>
Date:   Mon,  3 Jul 2017 15:35:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.9 144/172] spi: fix device-node leaks

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.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@...nel.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);