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net: stmmac: Use mutex instead of spinlock

Browse source 
commit 29555fa3de upstream.

Some drivers, such as DWC EQOS on Tegra, need to perform operations that
can sleep under this lock (clk_set_rate() in tegra_eqos_fix_speed()) for
proper operation. Since there is no need for this lock to be a spinlock,
convert it to a mutex instead.

Fixes: e6ea2d16fc ("net: stmmac: dwc-qos: Add Tegra186 support")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Tested-by: Bhadram Varka <vbhadram@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thierry Reding 2018-05-24 16:09:07 +02:00 committed by Greg Kroah-Hartman
parent ae811cecbb
commit d673c1e5e6
3 changed files with 21 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/net/ethernet/stmicro/stmmac/stmmac.h
View file

@ -96,7 +96,7 @@ struct stmmac_priv {
struct net_device *dev;
struct device *device;
struct mac_device_info *hw;
spinlock_t lock;
struct mutex lock;
/* RX Queue */
struct stmmac_rx_queue rx_queue[MTL_MAX_RX_QUEUES];

12
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
View file

@ -392,13 +392,13 @@ stmmac_ethtool_set_link_ksettings(struct net_device *dev,
ADVERTISED_10baseT_Half |
ADVERTISED_10baseT_Full);
spin_lock(&priv->lock);
mutex_lock(&priv->lock);
if (priv->hw->mac->pcs_ctrl_ane)
priv->hw->mac->pcs_ctrl_ane(priv->ioaddr, 1,
priv->hw->ps, 0);
spin_unlock(&priv->lock);
mutex_unlock(&priv->lock);
return 0;
}
@ -615,12 +615,12 @@ static void stmmac_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
struct stmmac_priv *priv = netdev_priv(dev);
spin_lock_irq(&priv->lock);
mutex_lock(&priv->lock);
if (device_can_wakeup(priv->device)) {
wol->supported = WAKE_MAGIC | WAKE_UCAST;
wol->wolopts = priv->wolopts;
}
spin_unlock_irq(&priv->lock);
mutex_unlock(&priv->lock);
}
static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
@ -649,9 +649,9 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
disable_irq_wake(priv->wol_irq);
}
spin_lock_irq(&priv->lock);
mutex_lock(&priv->lock);
priv->wolopts = wol->wolopts;
spin_unlock_irq(&priv->lock);
mutex_unlock(&priv->lock);
return 0;
}

31
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View file

@ -365,7 +365,6 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
{
struct net_device *ndev = priv->dev;
int interface = priv->plat->interface;
unsigned long flags;
bool ret = false;
if ((interface != PHY_INTERFACE_MODE_MII) &&
@ -392,7 +391,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
* changed).
* In that case the driver disable own timers.
*/
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
if (priv->eee_active) {
netdev_dbg(priv->dev, "disable EEE\n");
del_timer_sync(&priv->eee_ctrl_timer);
@ -400,11 +399,11 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
tx_lpi_timer);
}
priv->eee_active = 0;
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
goto out;
}
/* Activate the EEE and start timers */
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
if (!priv->eee_active) {
priv->eee_active = 1;
setup_timer(&priv->eee_ctrl_timer,
@ -421,7 +420,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
priv->hw->mac->set_eee_pls(priv->hw, ndev->phydev->link);
ret = true;
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");
}
@ -799,13 +798,12 @@ static void stmmac_adjust_link(struct net_device *dev)
{
struct stmmac_priv *priv = netdev_priv(dev);
struct phy_device *phydev = dev->phydev;
unsigned long flags;
bool new_state = false;
if (!phydev)
return;
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
if (phydev->link) {
u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
@ -864,7 +862,7 @@ static void stmmac_adjust_link(struct net_device *dev)
if (new_state && netif_msg_link(priv))
phy_print_status(phydev);
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
if (phydev->is_pseudo_fixed_link)
/* Stop PHY layer to call the hook to adjust the link in case
@ -4284,7 +4282,7 @@ int stmmac_dvr_probe(struct device *device,
(8 * priv->plat->rx_queues_to_use));
}
spin_lock_init(&priv->lock);
mutex_init(&priv->lock);
/* If a specific clk_csr value is passed from the platform
* this means that the CSR Clock Range selection cannot be
@ -4375,6 +4373,7 @@ int stmmac_dvr_remove(struct device *dev)
priv->hw->pcs != STMMAC_PCS_TBI &&
priv->hw->pcs != STMMAC_PCS_RTBI)
stmmac_mdio_unregister(ndev);
mutex_destroy(&priv->lock);
free_netdev(ndev);
return 0;
@ -4392,7 +4391,6 @@ int stmmac_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct stmmac_priv *priv = netdev_priv(ndev);
unsigned long flags;
if (!ndev || !netif_running(ndev))
return 0;
@ -4400,7 +4398,7 @@ int stmmac_suspend(struct device *dev)
if (ndev->phydev)
phy_stop(ndev->phydev);
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
netif_device_detach(ndev);
stmmac_stop_all_queues(priv);
@ -4423,7 +4421,7 @@ int stmmac_suspend(struct device *dev)
clk_disable_unprepare(priv->plat->pclk);
clk_disable_unprepare(priv->plat->stmmac_clk);
}
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
priv->oldlink = false;
priv->speed = SPEED_UNKNOWN;
@ -4467,7 +4465,6 @@ int stmmac_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct stmmac_priv *priv = netdev_priv(ndev);
unsigned long flags;
if (!netif_running(ndev))
return 0;
@ -4479,9 +4476,9 @@ int stmmac_resume(struct device *dev)
* from another devices (e.g. serial console).
*/
if (device_may_wakeup(priv->device)) {
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
priv->hw->mac->pmt(priv->hw, 0);
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
priv->irq_wake = 0;
} else {
pinctrl_pm_select_default_state(priv->device);
@ -4497,7 +4494,7 @@ int stmmac_resume(struct device *dev)
netif_device_attach(ndev);
spin_lock_irqsave(&priv->lock, flags);
mutex_lock(&priv->lock);
stmmac_reset_queues_param(priv);
@ -4516,7 +4513,7 @@ int stmmac_resume(struct device *dev)
stmmac_start_all_queues(priv);
spin_unlock_irqrestore(&priv->lock, flags);
mutex_unlock(&priv->lock);
if (ndev->phydev)
phy_start(ndev->phydev);