usbnet: smsc95xx: apply the introduced usbnet_{read|write}_cmd_nopm

This patch applies the introduced usbnet_read_cmd_nopm() and
usbnet_write_cmd_nopm() in the callback of resume and suspend
to avoid deadlock if USB runtime PM is considered into
usbnet_read_cmd() and usbnet_write_cmd().

Cc: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/smsc95xx.c

@@ -73,20 +73,26 @@ 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)
+static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
+					    u32 *data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 
 	BUG_ON(!dev);
 
-	ret = usbnet_read_cmd(dev, USB_VENDOR_REQUEST_READ_REGISTER,
-			      USB_DIR_IN | USB_TYPE_VENDOR |
-			      USB_RECIP_DEVICE,
-			      0, index, &buf, 4);
+	if (!in_pm)
+		fn = usbnet_read_cmd;
+	else
+		fn = usbnet_read_cmd_nopm;
+
+	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
-		netdev_warn(dev->net, "Failed to read register index 0x%08x\n", index);
+		netdev_warn(dev->net,
+			"Failed to read reg index 0x%08x: %d", index, ret);
 
 	le32_to_cpus(&buf);
 	*data = buf;
@@ -94,35 +100,64 @@ 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)
+static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
+					     u32 data, int in_pm)
 {
 	u32 buf;
 	int ret;
+	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
 
 	BUG_ON(!dev);
 
+	if (!in_pm)
+		fn = usbnet_write_cmd;
+	else
+		fn = usbnet_write_cmd_nopm;
+
 	buf = data;
 	cpu_to_le32s(&buf);
 
-
-	ret = usbnet_write_cmd(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
-			       USB_DIR_OUT | USB_TYPE_VENDOR |
-			       USB_RECIP_DEVICE,
-			       0, index, &buf, 4);
+	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
+		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+		 0, index, &buf, 4);
 	if (unlikely(ret < 0))
-		netdev_warn(dev->net, "Failed to write register index 0x%08x\n", index);
+		netdev_warn(dev->net,
+			"Failed to write reg index 0x%08x: %d", index, ret);
 
 	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);
+}
 static int smsc95xx_set_feature(struct usbnet *dev, u32 feature)
 {
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	return usbnet_write_cmd(dev, USB_REQ_SET_FEATURE,
-				USB_RECIP_DEVICE, feature, 0, NULL, 0);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_SET_FEATURE,
+				     USB_RECIP_DEVICE, feature, 0,
+				     NULL, 0);
 }
 
 static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature)
@@ -130,8 +165,9 @@ static int smsc95xx_clear_feature(struct usbnet *dev, u32 feature)
 	if (WARN_ON_ONCE(!dev))
 		return -EINVAL;
 
-	return usbnet_write_cmd(dev, USB_REQ_CLEAR_FEATURE,
-				USB_RECIP_DEVICE, feature, 0, NULL, 0);
+	return usbnet_write_cmd_nopm(dev, USB_REQ_CLEAR_FEATURE,
+				     USB_RECIP_DEVICE, feature,
+				     0, NULL, 0);
 }
 
 /* Loop until the read is completed with timeout
@@ -708,7 +744,7 @@ static int smsc95xx_start_tx_path(struct usbnet *dev)
 }
 
 /* Starts the Receive path */
-static int smsc95xx_start_rx_path(struct usbnet *dev)
+static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
 {
 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 	unsigned long flags;
@@ -718,7 +754,7 @@ static int smsc95xx_start_rx_path(struct usbnet *dev)
 	pdata->mac_cr |= MAC_CR_RXEN_;
 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
 
-	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
+	ret = __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 	check_warn_return(ret, "Failed to write MAC_CR: %d\n", ret);
 
 	return 0;
@@ -937,7 +973,7 @@ static int smsc95xx_reset(struct usbnet *dev)
 	ret = smsc95xx_start_tx_path(dev);
 	check_warn_return(ret, "Failed to start TX path");
 
-	ret = smsc95xx_start_rx_path(dev);
+	ret = smsc95xx_start_rx_path(dev, 0);
 	check_warn_return(ret, "Failed to start RX path");
 
 	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
@@ -1039,30 +1075,30 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		netdev_info(dev->net, "entering SUSPEND2 mode");
 
 		/* disable energy detect (link up) & wake up events */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 
 		/* enter suspend2 mode */
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
 		val |= PM_CTL_SUS_MODE_2;
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 
 		return 0;
@@ -1131,7 +1167,7 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count * 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
 			if (ret < 0)
 				kfree(filter_mask);
 			check_warn_return(ret, "Error writing WUFF");
@@ -1139,43 +1175,43 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		kfree(filter_mask);
 
 		for (i = 0; i < (pdata->wuff_filter_count / 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, command[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count / 4); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		for (i = 0; i < (pdata->wuff_filter_count / 2); i++) {
-			ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
+			ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
 			check_warn_return(ret, "Error writing WUFF");
 		}
 
 		/* clear any pending pattern match packet status */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_WUFR_;
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	if (pdata->wolopts & WAKE_MAGIC) {
 		/* clear any pending magic packet status */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val |= WUCSR_MPR_;
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 	}
 
 	/* enable/disable wakeup sources */
-	ret = smsc95xx_read_reg(dev, WUCSR, &val);
+	ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 	check_warn_return(ret, "Error reading WUCSR");
 
 	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
@@ -1194,41 +1230,41 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
 		val &= ~WUCSR_MPEN_;
 	}
 
-	ret = smsc95xx_write_reg(dev, WUCSR, val);
+	ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 	check_warn_return(ret, "Error writing WUCSR");
 
 	/* enable wol wakeup source */
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	val |= PM_CTL_WOL_EN_;
 
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* enable receiver to enable frame reception */
-	smsc95xx_start_rx_path(dev);
+	smsc95xx_start_rx_path(dev, 1);
 
 	/* some wol options are enabled, so enter SUSPEND0 */
 	netdev_info(dev->net, "entering SUSPEND0 mode");
 
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
 	val |= PM_CTL_SUS_MODE_0;
 
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* clear wol status */
 	val &= ~PM_CTL_WUPS_;
 	val |= PM_CTL_WUPS_WOL_;
-	ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 	check_warn_return(ret, "Error writing PM_CTRL");
 
 	/* read back PM_CTRL */
-	ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 	check_warn_return(ret, "Error reading PM_CTRL");
 
 	smsc95xx_set_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
@@ -1249,22 +1285,22 @@ static int smsc95xx_resume(struct usb_interface *intf)
 		smsc95xx_clear_feature(dev, USB_DEVICE_REMOTE_WAKEUP);
 
 		/* clear wake-up sources */
-		ret = smsc95xx_read_reg(dev, WUCSR, &val);
+		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
 		check_warn_return(ret, "Error reading WUCSR");
 
 		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
 
-		ret = smsc95xx_write_reg(dev, WUCSR, val);
+		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
 		check_warn_return(ret, "Error writing WUCSR");
 
 		/* clear wake-up status */
-		ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
 		check_warn_return(ret, "Error reading PM_CTRL");
 
 		val &= ~PM_CTL_WOL_EN_;
 		val |= PM_CTL_WUPS_;
 
-		ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
 		check_warn_return(ret, "Error writing PM_CTRL");
 	}