netdev - [RFC PATCH v2 4/6] net/core: apply pm_runtime_set_memalloc

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Date:	Mon, 22 Oct 2012 16:33:12 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Minchan Kim <minchan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jens Axboe <axboe@...nel.dk>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-mm@...ck.org,
	Ming Lei <ming.lei@...onical.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Decotigny <david.decotigny@...gle.com>,
	Tom Herbert <therbert@...gle.com>, Ingo Molnar <mingo@...e.hu>
Subject: [RFC PATCH v2 4/6] net/core: apply pm_runtime_set_memalloc_noio on network devices

Deadlock might be caused by allocating memory with GFP_KERNEL in
runtime_resume callback of network devices in iSCSI situation, so
mark network devices and its ancestor as 'memalloc_noio_resume'
with the introduced pm_runtime_set_memalloc_noio().

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Decotigny <david.decotigny@...gle.com>
Cc: Tom Herbert <therbert@...gle.com>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 net/core/net-sysfs.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index bcf02f6..9aba5be 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -22,6 +22,7 @@
 #include <linux/vmalloc.h>
 #include <linux/export.h>
 #include <linux/jiffies.h>
+#include <linux/pm_runtime.h>
 #include <net/wext.h>
 
 #include "net-sysfs.h"
@@ -1386,6 +1387,8 @@ void netdev_unregister_kobject(struct net_device * net)
 
 	remove_queue_kobjects(net);
 
+	pm_runtime_set_memalloc_noio(dev, false);
+
 	device_del(dev);
 }
 
@@ -1411,6 +1414,8 @@ int netdev_register_kobject(struct net_device *net)
 	*groups++ = &netstat_group;
 #endif /* CONFIG_SYSFS */
 
+	pm_runtime_set_memalloc_noio(dev, true);
+
 	error = device_add(dev);
 	if (error)
 		return error;
-- 
1.7.9.5

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