[PATCH] can: mcp251x: add error check when wq alloc failed

[Weitao Hou]

add error check when workqueue alloc failed, and remove
redundant code to make it clear

Signed-off-by: Weitao Hou <houweit...@gmail.com>
---
 drivers/net/can/spi/mcp251x.c | 49 ++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 27 deletions(-)

diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 44e99e3d7134..2aec934fab0c 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -664,17 +664,6 @@ static int mcp251x_power_enable(struct regulator *reg, int 
enable)
                return regulator_disable(reg);
 }
 
-static void mcp251x_open_clean(struct net_device *net)
-{
-       struct mcp251x_priv *priv = netdev_priv(net);
-       struct spi_device *spi = priv->spi;
-
-       free_irq(spi->irq, priv);
-       mcp251x_hw_sleep(spi);
-       mcp251x_power_enable(priv->transceiver, 0);
-       close_candev(net);
-}
-
 static int mcp251x_stop(struct net_device *net)
 {
        struct mcp251x_priv *priv = netdev_priv(net);
@@ -940,37 +929,43 @@ static int mcp251x_open(struct net_device *net)
                                   flags | IRQF_ONESHOT, DEVICE_NAME, priv);
        if (ret) {
                dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
-               mcp251x_power_enable(priv->transceiver, 0);
-               close_candev(net);
-               goto open_unlock;
+               goto out_close;
        }
 
        priv->wq = alloc_workqueue("mcp251x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM,
                                   0);
+       if (!priv->wq) {
+               ret = -ENOMEM;
+               goto out_clean;
+       }
        INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
        INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler);
 
        ret = mcp251x_hw_reset(spi);
-       if (ret) {
-               mcp251x_open_clean(net);
-               goto open_unlock;
-       }
+       if (ret)
+               goto out_free_wq;
        ret = mcp251x_setup(net, spi);
-       if (ret) {
-               mcp251x_open_clean(net);
-               goto open_unlock;
-       }
+       if (ret)
+               goto out_free_wq;
        ret = mcp251x_set_normal_mode(spi);
-       if (ret) {
-               mcp251x_open_clean(net);
-               goto open_unlock;
-       }
+       if (ret)
+               goto out_free_wq;
 
        can_led_event(net, CAN_LED_EVENT_OPEN);
 
        netif_wake_queue(net);
+       mutex_unlock(&priv->mcp_lock);
 
-open_unlock:
+       return 0;
+
+out_free_wq:
+       destroy_workqueue(priv->wq);
+out_clean:
+       free_irq(spi->irq, priv);
+       mcp251x_hw_sleep(spi);
+out_close:
+       mcp251x_power_enable(priv->transceiver, 0);
+       close_candev(net);
        mutex_unlock(&priv->mcp_lock);
        return ret;
 }
-- 
2.18.0