ks8851: Fix mutex deadlock in ks8851_net_stop()

[mirror_ubuntu-zesty-kernel.git] / drivers / net / ethernet / micrel / ks8851.c

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index c722aa607d074796985b9028c5c91752459aad8e..ad10759e34596d540402ee7e93f6dd5c8a786a70 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -889,16 +889,17 @@ static int ks8851_net_stop(struct net_device *dev)
        netif_stop_queue(dev);
 
        mutex_lock(&ks->lock);
+       /* turn off the IRQs and ack any outstanding */
+       ks8851_wrreg16(ks, KS_IER, 0x0000);
+       ks8851_wrreg16(ks, KS_ISR, 0xffff);
+       mutex_unlock(&ks->lock);
 
        /* stop any outstanding work */
        flush_work(&ks->irq_work);
        flush_work(&ks->tx_work);
        flush_work(&ks->rxctrl_work);
 
-       /* turn off the IRQs and ack any outstanding */
-       ks8851_wrreg16(ks, KS_IER, 0x0000);
-       ks8851_wrreg16(ks, KS_ISR, 0xffff);
-
+       mutex_lock(&ks->lock);
        /* shutdown RX process */
        ks8851_wrreg16(ks, KS_RXCR1, 0x0000);
 
@@ -907,6 +908,7 @@ static int ks8851_net_stop(struct net_device *dev)
 
        /* set powermode to soft power down to save power */
        ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
+       mutex_unlock(&ks->lock);
 
        /* ensure any queued tx buffers are dumped */
        while (!skb_queue_empty(&ks->txq)) {
@@ -918,7 +920,6 @@ static int ks8851_net_stop(struct net_device *dev)
                dev_kfree_skb(txb);
        }
 
-       mutex_unlock(&ks->lock);
        return 0;
 }
 
@@ -1418,6 +1419,7 @@ static int __devinit ks8851_probe(struct spi_device *spi)
        struct net_device *ndev;
        struct ks8851_net *ks;
        int ret;
+       unsigned cider;
 
        ndev = alloc_etherdev(sizeof(struct ks8851_net));
        if (!ndev)
@@ -1484,8 +1486,8 @@ static int __devinit ks8851_probe(struct spi_device *spi)
        ks8851_soft_reset(ks, GRR_GSR);
 
        /* simple check for a valid chip being connected to the bus */
-
-       if ((ks8851_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) {
+       cider = ks8851_rdreg16(ks, KS_CIDER);
+       if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
                dev_err(&spi->dev, "failed to read device ID\n");
                ret = -ENODEV;
                goto err_id;
@@ -1516,8 +1518,7 @@ static int __devinit ks8851_probe(struct spi_device *spi)
        }
 
        netdev_info(ndev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
-                   CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)),
-                   ndev->dev_addr, ndev->irq,
+                   CIDER_REV_GET(cider), ndev->dev_addr, ndev->irq,
                    ks->rc_ccr & CCR_EEPROM ? "has" : "no");
 
        return 0;