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[net-next,1/2] r8152: split rtl8152_resume function

Message ID 1394712342-15778-273-Taiwan-albertk@realtek.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Hayes Wang June 12, 2017, 8:21 a.m. UTC 
Split rtl8152_resume() into rtl8152_runtime_resume() and
rtl8152_system_resume().

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
---
 drivers/net/usb/r8152.c | 99 ++++++++++++++++++++++++++++++-------------------
 1 file changed, 61 insertions(+), 38 deletions(-)

Comments

Oliver Neukum June 12, 2017, 12:33 p.m. UTC | #1 
Am Montag, den 12.06.2017, 16:21 +0800 schrieb Hayes Wang:
> Split rtl8152_resume() into rtl8152_runtime_resume() and
> rtl8152_system_resume().
> 
> Signed-off-by: Hayes Wang <hayeswang@realtek.com>
> ---
>  drivers/net/usb/r8152.c | 99 ++++++++++++++++++++++++++++++-------------------
>  1 file changed, 61 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 5a02053..3257955 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -3686,6 +3686,61 @@ static bool delay_autosuspend(struct r8152 *tp)
>                 return false;
>  }
>  
> +static int rtl8152_runtime_resume(struct r8152 *tp)
> +{
> +       struct net_device *netdev = tp->netdev;
> +
> +       if (netif_running(netdev) && netdev->flags & IFF_UP) {
> +               struct napi_struct *napi = &tp->napi;
> +
> +               tp->rtl_ops.autosuspend_en(tp, false);
> +               napi_disable(napi);
> +               set_bit(WORK_ENABLE, &tp->flags);
> +
> +               if (netif_carrier_ok(netdev)) {
> +                       if (rtl8152_get_speed(tp) & LINK_STATUS) {
> +                               rtl_start_rx(tp);
> +                       } else {
> +                               netif_carrier_off(netdev);
> +                               tp->rtl_ops.disable(tp);
> +                               netif_info(tp, link, netdev, "linking down\n");
> +                       }
> +               }
> +
> +               napi_enable(napi);
> +               clear_bit(SELECTIVE_SUSPEND, &tp->flags);
> +               smp_mb__after_atomic();
> +
> +               if (!list_empty(&tp->rx_done))
> +                       napi_schedule(&tp->napi);
> +
> +               usb_submit_urb(tp->intr_urb, GFP_KERNEL);

If you ever built a device with included storage, this can deadlock,
as you may want to wake up a device for memory that is needed to wake
up a device. Use GFP_NOIO in resume() and reset_resume(), always.

	Regards
		Oliver
Hayes Wang June 13, 2017, 2:27 a.m. UTC | #2 
Oliver Neukum [mailto:oneukum@suse.com]
> Sent: Monday, June 12, 2017 8:33 PM

[...]
> > +               usb_submit_urb(tp->intr_urb, GFP_KERNEL);

> 

> If you ever built a device with included storage, this can deadlock,

> as you may want to wake up a device for memory that is needed to wake

> up a device. Use GFP_NOIO in resume() and reset_resume(), always.


I would change it. Thanks.

Best Regards,
Hayes
diff mbox

Patch

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 5a02053..3257955 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -3686,6 +3686,61 @@  static bool delay_autosuspend(struct r8152 *tp)
 		return false;
 }
 
+static int rtl8152_runtime_resume(struct r8152 *tp)
+{
+	struct net_device *netdev = tp->netdev;
+
+	if (netif_running(netdev) && netdev->flags & IFF_UP) {
+		struct napi_struct *napi = &tp->napi;
+
+		tp->rtl_ops.autosuspend_en(tp, false);
+		napi_disable(napi);
+		set_bit(WORK_ENABLE, &tp->flags);
+
+		if (netif_carrier_ok(netdev)) {
+			if (rtl8152_get_speed(tp) & LINK_STATUS) {
+				rtl_start_rx(tp);
+			} else {
+				netif_carrier_off(netdev);
+				tp->rtl_ops.disable(tp);
+				netif_info(tp, link, netdev, "linking down\n");
+			}
+		}
+
+		napi_enable(napi);
+		clear_bit(SELECTIVE_SUSPEND, &tp->flags);
+		smp_mb__after_atomic();
+
+		if (!list_empty(&tp->rx_done))
+			napi_schedule(&tp->napi);
+
+		usb_submit_urb(tp->intr_urb, GFP_KERNEL);
+	} else {
+		if (netdev->flags & IFF_UP)
+			tp->rtl_ops.autosuspend_en(tp, false);
+
+		clear_bit(SELECTIVE_SUSPEND, &tp->flags);
+	}
+
+	return 0;
+}
+
+static int rtl8152_system_resume(struct r8152 *tp)
+{
+	struct net_device *netdev = tp->netdev;
+
+	netif_device_attach(netdev);
+
+	if (netif_running(netdev) && netdev->flags & IFF_UP) {
+		tp->rtl_ops.up(tp);
+		netif_carrier_off(netdev);
+		set_bit(WORK_ENABLE, &tp->flags);
+		usb_submit_urb(tp->intr_urb, GFP_KERNEL);
+	}
+
+	return 0;
+}
+
 static int rtl8152_runtime_suspend(struct r8152 *tp)
 {
 	struct net_device *netdev = tp->netdev;
@@ -3784,50 +3839,18 @@  static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
 static int rtl8152_resume(struct usb_interface *intf)
 {
 	struct r8152 *tp = usb_get_intfdata(intf);
-	struct net_device *netdev = tp->netdev;
+	int ret;
 
 	mutex_lock(&tp->control);
 
-	if (!test_bit(SELECTIVE_SUSPEND, &tp->flags))
-		netif_device_attach(netdev);
-
-	if (netif_running(netdev) && netdev->flags & IFF_UP) {
-		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
-			struct napi_struct *napi = &tp->napi;
-
-			tp->rtl_ops.autosuspend_en(tp, false);
-			napi_disable(napi);
-			set_bit(WORK_ENABLE, &tp->flags);
-			if (netif_carrier_ok(netdev)) {
-				if (rtl8152_get_speed(tp) & LINK_STATUS) {
-					rtl_start_rx(tp);
-				} else {
-					netif_carrier_off(netdev);
-					tp->rtl_ops.disable(tp);
-					netif_info(tp, link, netdev,
-						   "linking down\n");
-				}
-			}
-			napi_enable(napi);
-			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
-			smp_mb__after_atomic();
-			if (!list_empty(&tp->rx_done))
-				napi_schedule(&tp->napi);
-		} else {
-			tp->rtl_ops.up(tp);
-			netif_carrier_off(netdev);
-			set_bit(WORK_ENABLE, &tp->flags);
-		}
-		usb_submit_urb(tp->intr_urb, GFP_KERNEL);
-	} else if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
-		if (netdev->flags & IFF_UP)
-			tp->rtl_ops.autosuspend_en(tp, false);
-		clear_bit(SELECTIVE_SUSPEND, &tp->flags);
-	}
+	if (test_bit(SELECTIVE_SUSPEND, &tp->flags))
+		ret = rtl8152_runtime_resume(tp);
+	else
+		ret = rtl8152_system_resume(tp);
 
 	mutex_unlock(&tp->control);
 
-	return 0;
+	return ret;
 }
 
 static int rtl8152_reset_resume(struct usb_interface *intf)