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Commit eacdd6c2 authored by Steve Glendinning's avatar Steve Glendinning Committed by David S. Miller
Browse files

smsc75xx: fix error handling in suspend failure case 



This patch ensures that if we fail to suspend the LAN7500 device
we call usbnet_resume before returning failure, instead of
leaving the usbnet driver in an unusable state.

Signed-off-by: default avatarSteve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f329ccdc

drivers/net/usb/smsc75xx.c

+38 −31
Original line number Diff line number Diff line
@@ -1346,7 +1346,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
	int ret;



	ret = usbnet_suspend(intf, message);

	check_warn_return(ret, "usbnet_suspend error\n");

	check_warn_goto_done(ret, "usbnet_suspend error\n");



	/* determine if link is up using only _nopm functions */

	link_up = smsc75xx_link_ok_nopm(dev);
@@ -1360,28 +1360,29 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 


		/* disable energy detect (link up) & wake up events */

		ret = smsc75xx_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_WUEN);



		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

		check_warn_return(ret, "Error writing WUCSR\n");

		check_warn_goto_done(ret, "Error writing WUCSR\n");



		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

		check_warn_return(ret, "Error reading PMT_CTL\n");

		check_warn_goto_done(ret, "Error reading PMT_CTL\n");



		val &= ~(PMT_CTL_ED_EN | PMT_CTL_WOL_EN);



		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

		check_warn_return(ret, "Error writing PMT_CTL\n");

		check_warn_goto_done(ret, "Error writing PMT_CTL\n");



		return smsc75xx_enter_suspend2(dev);

		ret = smsc75xx_enter_suspend2(dev);

		goto done;

	}



	if (pdata->wolopts & WAKE_PHY) {

		ret = smsc75xx_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
@@ -1393,7 +1394,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
			/* enable energy detect power-down mode */

			ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id,

				PHY_MODE_CTRL_STS);

			check_warn_return(ret, "Error reading PHY_MODE_CTRL_STS\n");

			check_warn_goto_done(ret, "Error reading PHY_MODE_CTRL_STS\n");



			ret |= MODE_CTRL_STS_EDPWRDOWN;
@@ -1401,7 +1402,8 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
				PHY_MODE_CTRL_STS, ret);



			/* enter SUSPEND1 mode */

			return smsc75xx_enter_suspend1(dev);

			ret = smsc75xx_enter_suspend1(dev);

			goto done;

		}

	}
@@ -1411,7 +1413,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
		/* disable all filters */

		for (i = 0; i < WUF_NUM; i++) {

			ret = smsc75xx_write_reg_nopm(dev, WUF_CFGX + i * 4, 0);

			check_warn_return(ret, "Error writing WUF_CFGX\n");

			check_warn_goto_done(ret, "Error writing WUF_CFGX\n");

		}



		if (pdata->wolopts & WAKE_MCAST) {
@@ -1421,7 +1423,7 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
			val = WUF_CFGX_EN | WUF_CFGX_ATYPE_MULTICAST

				| smsc_crc(mcast, 3);

			ret = smsc75xx_write_wuff(dev, filter++, val, 0x0007);

			check_warn_return(ret, "Error writing wakeup filter\n");

			check_warn_goto_done(ret, "Error writing wakeup filter\n");

		}



		if (pdata->wolopts & WAKE_ARP) {
@@ -1431,106 +1433,111 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message) 
			val = WUF_CFGX_EN | WUF_CFGX_ATYPE_ALL | (0x0C << 16)

				| smsc_crc(arp, 2);

			ret = smsc75xx_write_wuff(dev, filter++, val, 0x0003);

			check_warn_return(ret, "Error writing wakeup filter\n");

			check_warn_goto_done(ret, "Error writing wakeup filter\n");

		}



		/* clear any pending pattern match packet status */

		ret = smsc75xx_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 = smsc75xx_write_reg_nopm(dev, WUCSR, val);

		check_warn_return(ret, "Error writing WUCSR\n");

		check_warn_goto_done(ret, "Error writing WUCSR\n");



		netdev_info(dev->net, "enabling packet match detection\n");

		ret = smsc75xx_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_WUEN;



		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

		check_warn_return(ret, "Error writing WUCSR\n");

		check_warn_goto_done(ret, "Error writing WUCSR\n");

	} else {

		netdev_info(dev->net, "disabling packet match detection\n");

		ret = smsc75xx_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_WUEN;



		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

		check_warn_return(ret, "Error writing WUCSR\n");

		check_warn_goto_done(ret, "Error writing WUCSR\n");

	}



	/* disable magic, bcast & unicast wakeup sources */

	ret = smsc75xx_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_BCST_EN | WUCSR_PFDA_EN);



	ret = smsc75xx_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_PHY) {

		netdev_info(dev->net, "enabling PHY wakeup\n");



		ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);

		check_warn_return(ret, "Error reading PMT_CTL\n");

		check_warn_goto_done(ret, "Error reading PMT_CTL\n");



		/* clear wol status, enable energy detection */

		val &= ~PMT_CTL_WUPS;

		val |= (PMT_CTL_WUPS_ED | PMT_CTL_ED_EN);



		ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);

		check_warn_return(ret, "Error writing PMT_CTL\n");

		check_warn_goto_done(ret, "Error writing PMT_CTL\n");

	}



	if (pdata->wolopts & WAKE_MAGIC) {

		netdev_info(dev->net, "enabling magic packet wakeup\n");

		ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);

		check_warn_return(ret, "Error reading WUCSR\n");

		check_warn_goto_done(ret, "Error reading WUCSR\n");



		/* clear any pending magic packet status */

		val |= WUCSR_MPR | WUCSR_MPEN;



		ret = smsc75xx_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_BCAST) {

		netdev_info(dev->net, "enabling broadcast detection\n");

		ret = smsc75xx_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_BCAST_FR | WUCSR_BCST_EN;



		ret = smsc75xx_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_UCAST) {

		netdev_info(dev->net, "enabling unicast detection\n");

		ret = smsc75xx_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 | WUCSR_PFDA_EN;



		ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);

		check_warn_return(ret, "Error writing WUCSR\n");

		check_warn_goto_done(ret, "Error writing WUCSR\n");

	}



	/* enable receiver to enable frame reception */

	ret = smsc75xx_read_reg_nopm(dev, MAC_RX, &val);

	check_warn_return(ret, "Failed to read MAC_RX: %d\n", ret);

	check_warn_goto_done(ret, "Failed to read MAC_RX: %d\n", ret);



	val |= MAC_RX_RXEN;



	ret = smsc75xx_write_reg_nopm(dev, MAC_RX, val);

	check_warn_return(ret, "Failed to write MAC_RX: %d\n", ret);

	check_warn_goto_done(ret, "Failed to write MAC_RX: %d\n", ret);



	/* some wol options are enabled, so enter SUSPEND0 */

	netdev_info(dev->net, "entering SUSPEND0 mode\n");

	return smsc75xx_enter_suspend0(dev);

	ret = smsc75xx_enter_suspend0(dev);



done:

	if (ret)

		usbnet_resume(intf);

	return ret;

}



static int smsc75xx_resume(struct usb_interface *intf)