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can: flexcan: factor out transceiver {en,dis}able into seperate functions

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This patch moves the transceiver enable and disable into seperate functions,
where the NULL pointer check is hidden.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2014-02-28 17:18:27 +01:00
parent 9b00b300e7
commit f003698e23
1 changed files with 20 additions and 7 deletions
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27
drivers/net/can/flexcan.c
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@ -264,6 +264,22 @@ static inline void flexcan_write(u32 val, void __iomem *addr)
}
#endif
static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
{
if (!priv->reg_xceiver)
return 0;
return regulator_enable(priv->reg_xceiver);
}
static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
{
if (!priv->reg_xceiver)
return 0;
return regulator_disable(priv->reg_xceiver);
}
static inline int flexcan_has_and_handle_berr(const struct flexcan_priv *priv,
u32 reg_esr)
{
@ -808,11 +824,9 @@ static int flexcan_chip_start(struct net_device *dev)
if (priv->devtype_data->features & FLEXCAN_HAS_V10_FEATURES)
flexcan_write(0x0, &regs->rxfgmask);
if (priv->reg_xceiver) {
err = regulator_enable(priv->reg_xceiver);
if (err)
goto out;
}
err = flexcan_transceiver_enable(priv);
if (err)
goto out;
/* synchronize with the can bus */
reg_mcr = flexcan_read(&regs->mcr);
@ -857,8 +871,7 @@ static void flexcan_chip_stop(struct net_device *dev)
flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
&regs->ctrl);
if (priv->reg_xceiver)
regulator_disable(priv->reg_xceiver);
flexcan_transceiver_disable(priv);
priv->can.state = CAN_STATE_STOPPED;
return;