linux-kernel - [PATCH 4.9 05/51] can: rcar_can: Fix erroneous registration

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Message-Id: <20181211151612.945401954@linuxfoundation.org>
Date:   Tue, 11 Dec 2018 16:41:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Fabrizio Castro <fabrizio.castro@...renesas.com>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 05/51] can: rcar_can: Fix erroneous registration

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

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

[ Upstream commit 68c8d209cd4337da4fa04c672f0b62bb735969bc ]

Assigning 2 to "renesas,can-clock-select" tricks the driver into
registering the CAN interface, even though we don't want that.
This patch improves one of the checks to prevent that from happening.

Fixes: 862e2b6af9413b43 ("can: rcar_can: support all input clocks")
Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
Signed-off-by: Chris Paterson <Chris.Paterson2@...esas.com>
Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/can/rcar/rcar_can.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 788459f6bf5c..9b2c3bd00f8b 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -24,6 +24,9 @@
 
 #define RCAR_CAN_DRV_NAME	"rcar_can"
 
+#define RCAR_SUPPORTED_CLOCKS	(BIT(CLKR_CLKP1) | BIT(CLKR_CLKP2) | \
+				 BIT(CLKR_CLKEXT))
+
 /* Mailbox configuration:
  * mailbox 60 - 63 - Rx FIFO mailboxes
  * mailbox 56 - 59 - Tx FIFO mailboxes
@@ -789,7 +792,7 @@ static int rcar_can_probe(struct platform_device *pdev)
 		goto fail_clk;
 	}
 
-	if (clock_select >= ARRAY_SIZE(clock_names)) {
+	if (!(BIT(clock_select) & RCAR_SUPPORTED_CLOCKS)) {
 		err = -EINVAL;
 		dev_err(&pdev->dev, "invalid CAN clock selected\n");
 		goto fail_clk;
-- 
2.19.1