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Merge branch 'smsc95xx-deadlock'

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Lukas Wunner says:

====================
Deadlock no more in LAN95xx

Second attempt at fixing a runtime resume deadlock in the LAN95xx USB driver:

In short, the driver isn't using the "nopm" register accessors in portions
of its runtime resume path, causing a deadlock.  I'm fixing that by
auto-detecting whether nopm accessors shall be used, instead of
having to explicitly call them wherever it's necessary.
As a byproduct, code size shrinks significantly (see diffstat below).

Back in April I submitted a first attempt which was rejected by Alan Stern:
https://lore.kernel.org/all/6710d8c18ff54139cdc538763ba544187c5a0cee.1651041411.git.lukas@wunner.de/

That approach only detected whether a PM callback is running concurrently,
not whether the access is performed by the PM callback.  I've come up with
a different approach which should resolve the objection (see patch [1/3]).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2022-07-04 10:39:25 +01:00
parent 39bfb3c12d 03b3df43ce
commit 5ee4bba272
1 changed files with 86 additions and 116 deletions
Download Patch File Download Diff File Expand all files Collapse all files

202
drivers/net/usb/smsc95xx.c
View File

@@ -71,22 +71,22 @@ struct smsc95xx_priv {
struct fwnode_handle *irqfwnode;
struct mii_bus *mdiobus;
struct phy_device *phydev;
struct task_struct *pm_task;
};
static bool turbo_mode = true;
module_param(turbo_mode, bool, 0644);
MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
u32 *data, int in_pm)
static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
u32 *data)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
u32 buf;
int ret;
int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
BUG_ON(!dev);
if (!in_pm)
if (current != pdata->pm_task)
fn = usbnet_read_cmd;
else
fn = usbnet_read_cmd_nopm;
@@ -107,16 +107,15 @@ static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
return ret;
}
static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
u32 data, int in_pm)
static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
u32 data)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
u32 buf;
int ret;
int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
BUG_ON(!dev);
if (!in_pm)
if (current != pdata->pm_task)
fn = usbnet_write_cmd;
else
fn = usbnet_write_cmd_nopm;
@@ -134,41 +133,16 @@ static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
return ret;
}
static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
u32 *data)
{
return __smsc95xx_read_reg(dev, index, data, 1);
}
static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
u32 data)
{
return __smsc95xx_write_reg(dev, index, data, 1);
}
static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
u32 *data)
{
return __smsc95xx_read_reg(dev, index, data, 0);
}
static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
u32 data)
{
return __smsc95xx_write_reg(dev, index, data, 0);
}
/* Loop until the read is completed with timeout
* called with phy_mutex held */
static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
int in_pm)
static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
{
unsigned long start_time = jiffies;
u32 val;
int ret;
do {
ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
if (ret < 0) {
/* Ignore -ENODEV error during disconnect() */
if (ret == -ENODEV)
@@ -189,8 +163,7 @@ static u32 mii_address_cmd(int phy_id, int idx, u16 op)
return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
}
static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
int in_pm)
static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
{
u32 val, addr;
int ret;
@@ -198,7 +171,7 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
mutex_lock(&dev->phy_mutex);
/* confirm MII not busy */
ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
ret = smsc95xx_phy_wait_not_busy(dev);
if (ret < 0) {
netdev_warn(dev->net, "%s: MII is busy\n", __func__);
goto done;
@@ -206,20 +179,20 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
/* set the address, index & direction (read from PHY) */
addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
if (ret < 0) {
if (ret != -ENODEV)
netdev_warn(dev->net, "Error writing MII_ADDR\n");
goto done;
}
ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
ret = smsc95xx_phy_wait_not_busy(dev);
if (ret < 0) {
netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
goto done;
}
ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
ret = smsc95xx_read_reg(dev, MII_DATA, &val);
if (ret < 0) {
if (ret != -ENODEV)
netdev_warn(dev->net, "Error reading MII_DATA\n");
@@ -237,8 +210,8 @@ static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
return ret;
}
static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
int idx, int regval, int in_pm)
static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
int regval)
{
u32 val, addr;
int ret;
@@ -246,14 +219,14 @@ static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
mutex_lock(&dev->phy_mutex);
/* confirm MII not busy */
ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
ret = smsc95xx_phy_wait_not_busy(dev);
if (ret < 0) {
netdev_warn(dev->net, "%s: MII is busy\n", __func__);
goto done;
}
val = regval;
ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
ret = smsc95xx_write_reg(dev, MII_DATA, val);
if (ret < 0) {
if (ret != -ENODEV)
netdev_warn(dev->net, "Error writing MII_DATA\n");
@@ -262,14 +235,14 @@ static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
/* set the address, index & direction (write to PHY) */
addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
if (ret < 0) {
if (ret != -ENODEV)
netdev_warn(dev->net, "Error writing MII_ADDR\n");
goto done;
}
ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
ret = smsc95xx_phy_wait_not_busy(dev);
if (ret < 0) {
netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
goto done;
@@ -279,25 +252,11 @@ static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
mutex_unlock(&dev->phy_mutex);
}
static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
}
static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
__smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
}
static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
{
struct usbnet *dev = bus->priv;
return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
return smsc95xx_mdio_read(dev, phy_id, idx);
}
static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
@@ -305,7 +264,7 @@ static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
{
struct usbnet *dev = bus->priv;
__smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
smsc95xx_mdio_write(dev, phy_id, idx, regval);
return 0;
}
@@ -865,7 +824,7 @@ static int smsc95xx_start_tx_path(struct usbnet *dev)
}
/* Starts the Receive path */
static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
static int smsc95xx_start_rx_path(struct usbnet *dev)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
unsigned long flags;
@@ -874,7 +833,7 @@ static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
pdata->mac_cr |= MAC_CR_RXEN_;
spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
}
static int smsc95xx_reset(struct usbnet *dev)
@@ -1057,7 +1016,7 @@ static int smsc95xx_reset(struct usbnet *dev)
return ret;
}
ret = smsc95xx_start_rx_path(dev, 0);
ret = smsc95xx_start_rx_path(dev);
if (ret < 0) {
netdev_warn(dev->net, "Failed to start RX path\n");
return ret;
@@ -1291,16 +1250,17 @@ static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
return crc << ((filter % 2) * 16);
}
static int smsc95xx_link_ok_nopm(struct usbnet *dev)
static int smsc95xx_link_ok(struct usbnet *dev)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
int ret;
/* first, a dummy read, needed to latch some MII phys */
ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
if (ret < 0)
return ret;
ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
if (ret < 0)
return ret;
@@ -1313,14 +1273,14 @@ static int smsc95xx_enter_suspend0(struct usbnet *dev)
u32 val;
int ret;
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
val |= PM_CTL_SUS_MODE_0;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1332,12 +1292,12 @@ static int smsc95xx_enter_suspend0(struct usbnet *dev)
if (pdata->wolopts & WAKE_PHY)
val |= PM_CTL_WUPS_ED_;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
/* read back PM_CTRL */
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
@@ -1349,34 +1309,34 @@ static int smsc95xx_enter_suspend0(struct usbnet *dev)
static int smsc95xx_enter_suspend1(struct usbnet *dev)
{
struct smsc95xx_priv *pdata = dev->driver_priv;
int ret, phy_id = pdata->phydev->mdio.addr;
u32 val;
int ret;
/* reconfigure link pulse detection timing for
* compatibility with non-standard link partners
*/
if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
PHY_EDPD_CONFIG_DEFAULT);
smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
PHY_EDPD_CONFIG_DEFAULT);
/* enable energy detect power-down mode */
ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
if (ret < 0)
return ret;
ret |= MODE_CTRL_STS_EDPWRDOWN_;
smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
/* enter SUSPEND1 mode */
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
val |= PM_CTL_SUS_MODE_1;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1384,7 +1344,7 @@ static int smsc95xx_enter_suspend1(struct usbnet *dev)
val &= ~PM_CTL_WUPS_;
val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1399,14 +1359,14 @@ static int smsc95xx_enter_suspend2(struct usbnet *dev)
u32 val;
int ret;
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
val |= PM_CTL_SUS_MODE_2;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1421,7 +1381,7 @@ static int smsc95xx_enter_suspend3(struct usbnet *dev)
u32 val;
int ret;
ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
if (ret < 0)
return ret;
@@ -1430,14 +1390,14 @@ static int smsc95xx_enter_suspend3(struct usbnet *dev)
return -EBUSY;
}
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1445,7 +1405,7 @@ static int smsc95xx_enter_suspend3(struct usbnet *dev)
val &= ~PM_CTL_WUPS_;
val |= PM_CTL_WUPS_WOL_;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
@@ -1490,9 +1450,12 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
u32 val, link_up;
int ret;
pdata->pm_task = current;
ret = usbnet_suspend(intf, message);
if (ret < 0) {
netdev_warn(dev->net, "usbnet_suspend error\n");
pdata->pm_task = NULL;
return ret;
}
@@ -1501,8 +1464,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
pdata->suspend_flags = 0;
}
/* determine if link is up using only _nopm functions */
link_up = smsc95xx_link_ok_nopm(dev);
link_up = smsc95xx_link_ok(dev);
if (message.event == PM_EVENT_AUTO_SUSPEND &&
(pdata->features & FEATURE_REMOTE_WAKEUP)) {
@@ -1519,23 +1481,23 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
netdev_info(dev->net, "entering SUSPEND2 mode\n");
/* disable energy detect (link up) & wake up events */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
ret = smsc95xx_read_reg(dev, WUCSR, &val);
if (ret < 0)
goto done;
val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
ret = smsc95xx_write_reg(dev, WUCSR, val);
if (ret < 0)
goto done;
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
goto done;
val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
goto done;
@@ -1626,7 +1588,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
}
for (i = 0; i < (wuff_filter_count * 4); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
if (ret < 0) {
kfree(filter_mask);
goto done;
@@ -1635,50 +1597,50 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
kfree(filter_mask);
for (i = 0; i < (wuff_filter_count / 4); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
ret = smsc95xx_write_reg(dev, WUFF, command[i]);
if (ret < 0)
goto done;
}
for (i = 0; i < (wuff_filter_count / 4); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
if (ret < 0)
goto done;
}
for (i = 0; i < (wuff_filter_count / 2); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
if (ret < 0)
goto done;
}
/* clear any pending pattern match packet status */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
ret = smsc95xx_read_reg(dev, WUCSR, &val);
if (ret < 0)
goto done;
val |= WUCSR_WUFR_;
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
ret = smsc95xx_write_reg(dev, WUCSR, val);
if (ret < 0)
goto done;
}
if (pdata->wolopts & WAKE_MAGIC) {
/* clear any pending magic packet status */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
ret = smsc95xx_read_reg(dev, WUCSR, &val);
if (ret < 0)
goto done;
val |= WUCSR_MPR_;
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
ret = smsc95xx_write_reg(dev, WUCSR, val);
if (ret < 0)
goto done;
}
/* enable/disable wakeup sources */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
ret = smsc95xx_read_reg(dev, WUCSR, &val);
if (ret < 0)
goto done;
@@ -1698,12 +1660,12 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
val &= ~WUCSR_MPEN_;
}
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
ret = smsc95xx_write_reg(dev, WUCSR, val);
if (ret < 0)
goto done;
/* enable wol wakeup source */
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
goto done;
@@ -1713,12 +1675,12 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
if (pdata->wolopts & WAKE_PHY)
val |= PM_CTL_ED_EN_;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
goto done;
/* enable receiver to enable frame reception */
smsc95xx_start_rx_path(dev, 1);
smsc95xx_start_rx_path(dev);
/* some wol options are enabled, so enter SUSPEND0 */
netdev_info(dev->net, "entering SUSPEND0 mode\n");
@@ -1732,6 +1694,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
if (ret && PMSG_IS_AUTO(message))
usbnet_resume(intf);
pdata->pm_task = NULL;
return ret;
}
@@ -1752,29 +1715,31 @@ static int smsc95xx_resume(struct usb_interface *intf)
/* do this first to ensure it's cleared even in error case */
pdata->suspend_flags = 0;
pdata->pm_task = current;
if (suspend_flags & SUSPEND_ALLMODES) {
/* clear wake-up sources */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
ret = smsc95xx_read_reg(dev, WUCSR, &val);
if (ret < 0)
return ret;
goto done;
val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
ret = smsc95xx_write_reg(dev, WUCSR, val);
if (ret < 0)
return ret;
goto done;
/* clear wake-up status */
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
if (ret < 0)
return ret;
goto done;
val &= ~PM_CTL_WOL_EN_;
val |= PM_CTL_WUPS_;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
ret = smsc95xx_write_reg(dev, PM_CTRL, val);
if (ret < 0)
return ret;
goto done;
}
phy_init_hw(pdata->phydev);
@@ -1783,15 +1748,20 @@ static int smsc95xx_resume(struct usb_interface *intf)
if (ret < 0)
netdev_warn(dev->net, "usbnet_resume error\n");
done:
pdata->pm_task = NULL;
return ret;
}
static int smsc95xx_reset_resume(struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
struct smsc95xx_priv *pdata = dev->driver_priv;
int ret;
pdata->pm_task = current;
ret = smsc95xx_reset(dev);
pdata->pm_task = NULL;
if (ret < 0)
return ret;