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Date:	Thu, 28 Jul 2016 21:30:03 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Sabrina Dubroca <sd@...asysnail.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Satyam Sharma <satyam@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	intel-wired-lan@...ts.osuosl.org,
	Ye Xiaolong <xiaolong.ye@...el.com>
Subject: Re: [e1000_netpoll] BUG: sleeping function called from invalid
 context at kernel/irq/manage.c:110

Hi Sabrina,

>The idea when this first came up was to skip the sleeping part of
>disable_irq():
>
>http://marc.info/?l=linux-netdev&m=142314159626052
>
>This fell off my todolist and I didn't send the conversion patches,
>which would basically look like this:

Yes it works in the several machines that had the BUG!

[   23.806847] netpoll: netconsole: local port 6665
[   23.807145] netpoll: netconsole: local IPv4 address 0.0.0.0
[   23.807494] netpoll: netconsole: interface 'eth0'
[   23.807799] netpoll: netconsole: remote port 6646
[   23.808096] netpoll: netconsole: remote IPv4 address 192.168.1.1
[   23.808474] netpoll: netconsole: remote ethernet address ff:ff:ff:ff:ff:ff
[   23.808910] netpoll: netconsole: local IP 192.168.1.161
[   23.811680] 28 Jul 19:42:10 ntpdate[376]: step time server 192.168.1.1 offset 1696.257557 sec
[   23.811886] console [netcon0] enabled
[   23.812131] netconsole: network logging started

Thanks,
Fengguang

>
>diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
>index 41f32c0b341e..b022691e680b 100644
>--- a/drivers/net/ethernet/intel/e1000e/netdev.c
>+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
>@@ -6713,20 +6713,20 @@ static irqreturn_t e1000_intr_msix(int __always_unused irq, void *data)
>
> 		vector = 0;
> 		msix_irq = adapter->msix_entries[vector].vector;
>-		disable_irq(msix_irq);
>-		e1000_intr_msix_rx(msix_irq, netdev);
>+		if (disable_hardirq(msix_irq))
>+			e1000_intr_msix_rx(msix_irq, netdev);
> 		enable_irq(msix_irq);
>
> 		vector++;
> 		msix_irq = adapter->msix_entries[vector].vector;
>-		disable_irq(msix_irq);
>-		e1000_intr_msix_tx(msix_irq, netdev);
>+		if (disable_hardirq(msix_irq))
>+			e1000_intr_msix_tx(msix_irq, netdev);
> 		enable_irq(msix_irq);
>
> 		vector++;
> 		msix_irq = adapter->msix_entries[vector].vector;
>-		disable_irq(msix_irq);
>-		e1000_msix_other(msix_irq, netdev);
>+		if (disable_hardirq(msix_irq))
>+			e1000_msix_other(msix_irq, netdev);
> 		enable_irq(msix_irq);
> 	}
>
>@@ -6750,13 +6750,13 @@ static void e1000_netpoll(struct net_device *netdev)
> 		e1000_intr_msix(adapter->pdev->irq, netdev);
> 		break;
> 	case E1000E_INT_MODE_MSI:
>-		disable_irq(adapter->pdev->irq);
>-		e1000_intr_msi(adapter->pdev->irq, netdev);
>+		if (disable_hardirq(adapter->pdev->irq))
>+			e1000_intr_msi(adapter->pdev->irq, netdev);
> 		enable_irq(adapter->pdev->irq);
> 		break;
> 	default:		/* E1000E_INT_MODE_LEGACY */
>-		disable_irq(adapter->pdev->irq);
>-		e1000_intr(adapter->pdev->irq, netdev);
>+		if (disable_hardirq(adapter->pdev->irq))
>+			e1000_intr(adapter->pdev->irq, netdev);
> 		enable_irq(adapter->pdev->irq);
> 		br
>ak;
> 	}

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