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Date: Fri, 30 Nov 2012 15:55:49 +0000
From: Steve Glendinning <steve.glendinning@...well.net>
To: netdev@...r.kernel.org
Cc: Steve Glendinning <steve.glendinning@...well.net>
Subject: [PATCH 2/5] smsc95xx: fix error handling in suspend failure case
This patch ensures that if we fail to suspend the LAN9500 device
we call usbnet_resume before returning failure, instead of
leaving the usbnet driver in an unusable state.
Signed-off-by: Steve Glendinning <steve.glendinning@...well.net>
---
drivers/net/usb/smsc95xx.c | 50 +++++++++++++++++++++++++-------------------
1 file changed, 29 insertions(+), 21 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index c397b3a..ffeaf13 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1248,35 +1248,37 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
/* disable energy detect (link up) & wake up events */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
- check_warn_return(ret, "Error reading WUCSR\n");
+ check_warn_goto_done(ret, "Error reading WUCSR\n");
val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
- check_warn_return(ret, "Error writing WUCSR\n");
+ check_warn_goto_done(ret, "Error writing WUCSR\n");
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
- check_warn_return(ret, "Error reading PM_CTRL\n");
+ check_warn_goto_done(ret, "Error reading PM_CTRL\n");
val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
- check_warn_return(ret, "Error writing PM_CTRL\n");
+ check_warn_goto_done(ret, "Error writing PM_CTRL\n");
- return smsc95xx_enter_suspend2(dev);
+ ret = smsc95xx_enter_suspend2(dev);
+ goto done;
}
if (pdata->wolopts & WAKE_PHY) {
ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
(PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
- check_warn_return(ret, "error enabling PHY wakeup ints\n");
+ check_warn_goto_done(ret, "error enabling PHY wakeup ints\n");
/* if link is down then configure EDPD and enter SUSPEND1,
* otherwise enter SUSPEND0 below
*/
if (!link_up) {
netdev_info(dev->net, "entering SUSPEND1 mode\n");
- return smsc95xx_enter_suspend1(dev);
+ ret = smsc95xx_enter_suspend1(dev);
+ goto done;
}
}
@@ -1292,7 +1294,8 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
if (!filter_mask) {
netdev_warn(dev->net, "Unable to allocate filter_mask\n");
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto done;
}
memset(command, 0, sizeof(command));
@@ -1354,49 +1357,49 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
if (ret < 0)
kfree(filter_mask);
- check_warn_return(ret, "Error writing WUFF\n");
+ check_warn_goto_done(ret, "Error writing WUFF\n");
}
kfree(filter_mask);
for (i = 0; i < (wuff_filter_count / 4); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
- check_warn_return(ret, "Error writing WUFF\n");
+ check_warn_goto_done(ret, "Error writing WUFF\n");
}
for (i = 0; i < (wuff_filter_count / 4); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
- check_warn_return(ret, "Error writing WUFF\n");
+ check_warn_goto_done(ret, "Error writing WUFF\n");
}
for (i = 0; i < (wuff_filter_count / 2); i++) {
ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
- check_warn_return(ret, "Error writing WUFF\n");
+ check_warn_goto_done(ret, "Error writing WUFF\n");
}
/* clear any pending pattern match packet status */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
- check_warn_return(ret, "Error reading WUCSR\n");
+ check_warn_goto_done(ret, "Error reading WUCSR\n");
val |= WUCSR_WUFR_;
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
- check_warn_return(ret, "Error writing WUCSR\n");
+ check_warn_goto_done(ret, "Error writing WUCSR\n");
}
if (pdata->wolopts & WAKE_MAGIC) {
/* clear any pending magic packet status */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
- check_warn_return(ret, "Error reading WUCSR\n");
+ check_warn_goto_done(ret, "Error reading WUCSR\n");
val |= WUCSR_MPR_;
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
- check_warn_return(ret, "Error writing WUCSR\n");
+ check_warn_goto_done(ret, "Error writing WUCSR\n");
}
/* enable/disable wakeup sources */
ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
- check_warn_return(ret, "Error reading WUCSR\n");
+ check_warn_goto_done(ret, "Error reading WUCSR\n");
if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
netdev_info(dev->net, "enabling pattern match wakeup\n");
@@ -1415,11 +1418,11 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
}
ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
- check_warn_return(ret, "Error writing WUCSR\n");
+ check_warn_goto_done(ret, "Error writing WUCSR\n");
/* enable wol wakeup source */
ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
- check_warn_return(ret, "Error reading PM_CTRL\n");
+ check_warn_goto_done(ret, "Error reading PM_CTRL\n");
val |= PM_CTL_WOL_EN_;
@@ -1428,14 +1431,19 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
val |= PM_CTL_ED_EN_;
ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
- check_warn_return(ret, "Error writing PM_CTRL\n");
+ check_warn_goto_done(ret, "Error writing PM_CTRL\n");
/* enable receiver to enable frame reception */
smsc95xx_start_rx_path(dev, 1);
/* some wol options are enabled, so enter SUSPEND0 */
netdev_info(dev->net, "entering SUSPEND0 mode\n");
- return smsc95xx_enter_suspend0(dev);
+ ret = smsc95xx_enter_suspend0(dev);
+
+done:
+ if (ret)
+ usbnet_resume(intf);
+ return ret;
}
static int smsc95xx_resume(struct usb_interface *intf)
--
1.7.10.4
--
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