diff options
| author | Huacai Chen <chenhc@lemote.com> | 2014-12-19 22:38:18 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-22 15:42:13 -0500 |
| commit | fe13192911507c49002fc4882ef11f75f529a010 (patch) | |
| tree | 09eccc1243ff0f6abdb9e66fb1f31a28974303bb | |
| parent | da413eec729dae5dcb150e2eb34c5e7e5e4e1b49 (diff) | |
stmmac: Don't init ptp again when resume from suspend/hibernation
Both stmmac_open() and stmmac_resume() call stmmac_hw_setup(), and
stmmac_hw_setup() call stmmac_init_ptp() unconditionally. However, only
stmmac_release() calls stmmac_release_ptp(). Since stmmac_suspend()
doesn't call stmmac_release_ptp(), stmmac_resume() also needn't call
stmmac_init_ptp().
This patch also fix a "scheduling while atomic" problem when resume
from suspend/hibernation. Because stmmac_init_ptp() will trigger
scheduling while stmmac_resume() hold a spinlock.
Callgraph of "scheduling while atomic":
stmmac_resume() --> stmmac_hw_setup() --> stmmac_init_ptp() -->
stmmac_ptp_register() --> ptp_clock_register() --> device_create() -->
device_create_groups_vargs() --> device_add() --> devtmpfs_create_node()
--> wait_for_common() --> schedule_timeout() --> __schedule()
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 118a427d1942..8c6b7c1651e5 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -1671,7 +1671,7 @@ static void stmmac_init_tx_coalesce(struct stmmac_priv *priv) * 0 on success and an appropriate (-)ve integer as defined in errno.h * file on failure. */ -static int stmmac_hw_setup(struct net_device *dev) +static int stmmac_hw_setup(struct net_device *dev, bool init_ptp) { struct stmmac_priv *priv = netdev_priv(dev); int ret; @@ -1708,9 +1708,11 @@ static int stmmac_hw_setup(struct net_device *dev) stmmac_mmc_setup(priv); - ret = stmmac_init_ptp(priv); - if (ret && ret != -EOPNOTSUPP) - pr_warn("%s: failed PTP initialisation\n", __func__); + if (init_ptp) { + ret = stmmac_init_ptp(priv); + if (ret && ret != -EOPNOTSUPP) + pr_warn("%s: failed PTP initialisation\n", __func__); + } #ifdef CONFIG_DEBUG_FS ret = stmmac_init_fs(dev); @@ -1787,7 +1789,7 @@ static int stmmac_open(struct net_device *dev) goto init_error; } - ret = stmmac_hw_setup(dev); + ret = stmmac_hw_setup(dev, true); if (ret < 0) { pr_err("%s: Hw setup failed\n", __func__); goto init_error; @@ -3036,7 +3038,7 @@ int stmmac_resume(struct net_device *ndev) netif_device_attach(ndev); init_dma_desc_rings(ndev, GFP_ATOMIC); - stmmac_hw_setup(ndev); + stmmac_hw_setup(ndev, false); stmmac_init_tx_coalesce(priv); napi_enable(&priv->napi); |