Commit aa10181b authored by Fabio Estevam's avatar Fabio Estevam Committed by Marc Kleine-Budde
Browse files

can: flexcan: Check the return value from clk_prepare_enable() 



clk_prepare_enable() may fail, so let's check its return value and propagate it
in the case of error.

Signed-off-by: default avatarFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 933e4af4

drivers/net/can/flexcan.c

+20 −8
Original line number Diff line number Diff line
@@ -850,12 +850,17 @@ static int flexcan_open(struct net_device *dev) 
	struct flexcan_priv *priv = netdev_priv(dev);

	int err;



	clk_prepare_enable(priv->clk_ipg);

	clk_prepare_enable(priv->clk_per);

	err = clk_prepare_enable(priv->clk_ipg);

	if (err)

		return err;



	err = clk_prepare_enable(priv->clk_per);

	if (err)

		goto out_disable_ipg;



	err = open_candev(dev);

	if (err)

		goto out;

		goto out_disable_per;



	err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev);

	if (err)
@@ -875,8 +880,9 @@ static int flexcan_open(struct net_device *dev) 


 out_close:

	close_candev(dev);

 out:

 out_disable_per:

	clk_disable_unprepare(priv->clk_per);

 out_disable_ipg:

	clk_disable_unprepare(priv->clk_ipg);



	return err;
@@ -933,8 +939,13 @@ static int register_flexcandev(struct net_device *dev) 
	struct flexcan_regs __iomem *regs = priv->base;

	u32 reg, err;



	clk_prepare_enable(priv->clk_ipg);

	clk_prepare_enable(priv->clk_per);

	err = clk_prepare_enable(priv->clk_ipg);

	if (err)

		return err;



	err = clk_prepare_enable(priv->clk_per);

	if (err)

		goto out_disable_ipg;



	/* select "bus clock", chip must be disabled */

	flexcan_chip_disable(priv);
@@ -959,15 +970,16 @@ static int register_flexcandev(struct net_device *dev) 
	if (!(reg & FLEXCAN_MCR_FEN)) {

		netdev_err(dev, "Could not enable RX FIFO, unsupported core\n");

		err = -ENODEV;

		goto out;

		goto out_disable_per;

	}



	err = register_candev(dev);



 out:

 out_disable_per:

	/* disable core and turn off clocks */

	flexcan_chip_disable(priv);

	clk_disable_unprepare(priv->clk_per);

 out_disable_ipg:

	clk_disable_unprepare(priv->clk_ipg);



	return err;