From: Fugang Duan <b38611@freescale.com>
To: <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>, <festevam@gmail.com>,
<sparse@chrisli.org>, <b20596@freescale.com>,
<b38611@freescale.com>
Subject: [PATCH] net: fec: Fix sparse warnings with different lock contexts for basic block
Date: Sat, 11 Oct 2014 11:00:29 +0800 [thread overview]
Message-ID: <1412996429-2253-1-git-send-email-b38611@freescale.com> (raw)
reproduce:
make ARCH=arm C=1 2>fec.txt drivers/net/ethernet/freescale/fec_main.o
cat fec.txt
sparse warnings:
drivers/net/ethernet/freescale/fec_main.c:2916:12: warning: context imbalance
in 'fec_set_features' - different lock contexts for basic block
Christopher Li suggest to change as below:
if (need_lock) {
lock();
do_something_real();
unlock();
} else {
do_something_real();
}
Reported-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Christopher Li <sparse@chrisli.org>
---
drivers/net/ethernet/freescale/fec_main.c | 24 ++++++++++++++----------
1 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 87975b5..7a8209e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2912,20 +2912,12 @@ static void fec_poll_controller(struct net_device *dev)
#endif
#define FEATURES_NEED_QUIESCE NETIF_F_RXCSUM
-
-static int fec_set_features(struct net_device *netdev,
+static inline void fec_enet_set_netdev_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 */
@@ -2935,13 +2927,25 @@ static int fec_set_features(struct net_device *netdev,
else
fep->csum_flags &= ~FLAG_RX_CSUM_ENABLED;
}
+}
+
+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;
- /* Resume the device after updates */
if (netif_running(netdev) && changed & FEATURES_NEED_QUIESCE) {
+ napi_disable(&fep->napi);
+ netif_tx_lock_bh(netdev);
+ fec_stop(netdev);
+ fec_enet_set_netdev_features(netdev, features);
fec_restart(netdev);
netif_tx_wake_all_queues(netdev);
netif_tx_unlock_bh(netdev);
napi_enable(&fep->napi);
+ } else {
+ fec_enet_set_netdev_features(netdev, features);
}
return 0;
--
1.7.8
next reply other threads:[~2014-10-11 3:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-11 3:00 Fugang Duan [this message]
2014-10-11 21:22 ` [PATCH] net: fec: Fix sparse warnings with different lock contexts for basic block Fabio Estevam
2014-10-13 1:35 ` fugang.duan
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