linux-kernel - [PATCH 3.19.y-ckt 057/146] net: qca_spi: Fix possible race during probe

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Message-Id: <1434579851-1719-58-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jun 2015 15:22:42 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Stefan Wahren <stefan.wahren@...e.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 057/146] net: qca_spi: Fix possible race during probe

3.19.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Stefan Wahren <stefan.wahren@...e.com>

commit 268be0f7a7d9b3644bcb99568efba13cb208b627 upstream.

Registering the netdev before setting the priv data is unsafe.
So fix this possible race by setting the priv data first.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Fixes: 291ab06e (net: qualcomm: new Ethernet over SPI driver for QCA7000)
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 2c811f6..eacd476 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -913,6 +913,8 @@ qca_spi_probe(struct spi_device *spi_device)
 	qca->spi_dev = spi_device;
 	qca->legacy_mode = legacy_mode;
 
+	spi_set_drvdata(spi_device, qcaspi_devs);
+
 	mac = of_get_mac_address(spi_device->dev.of_node);
 
 	if (mac)
@@ -945,8 +947,6 @@ qca_spi_probe(struct spi_device *spi_device)
 		return -EFAULT;
 	}
 
-	spi_set_drvdata(spi_device, qcaspi_devs);
-
 	qcaspi_init_device_debugfs(qca);
 
 	return 0;
-- 
1.9.1

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