netdev - fec_main: context imbalance in 'fec_set

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Message-ID: <CAOMZO5CJKp7+d8EPRZdr-3Bd9UxVU8fxLybFZ4uLn+cUQjPH8w@mail.gmail.com>
Date:	Wed, 1 Oct 2014 21:15:53 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Frank Li <Frank.Li@...escale.com>,
	Duan Fugang-B38611 <B38611@...escale.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-sparse@...r.kernel.org
Subject: fec_main: context imbalance in 'fec_set_features'

Hi,

sparse complains the following:

drivers/net/ethernet/freescale/fec_main.c:2835:12: warning: context
imbalance in 'fec_set_features' - different lock contexts for basic
block

The code looks like this:

static int fec_set_features(struct net_device *netdev,
    netdev_features_t features)
{
    struct fec_enet_private *fep = netdev_priv(netdev);
    netdev_features_t changed = features ^ netdev->features;

    /* Quiesce the device if necessary */
    if (netif_running(netdev) && changed & FEATURES_NEED_QUIESCE) {
        napi_disable(&fep->napi);
        netif_tx_lock_bh(netdev);
        fec_stop(netdev);
    }

    netdev->features = features;

    /* Receive checksum has been changed */
    if (changed & NETIF_F_RXCSUM) {
        if (features & NETIF_F_RXCSUM)
            fep->csum_flags |= FLAG_RX_CSUM_ENABLED;
        else
            fep->csum_flags &= ~FLAG_RX_CSUM_ENABLED;
    }

    /* Resume the device after updates */
    if (netif_running(netdev) && changed & FEATURES_NEED_QUIESCE) {
        fec_restart(netdev);
        netif_tx_wake_all_queues(netdev);
        netif_tx_unlock_bh(netdev);
        napi_enable(&fep->napi);
    }

    return 0;
}

What would be the proper way to fix this warning?

Thanks,

Fabio Estevam
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