linux-kernel - [PATCH v7 4/6] net/core: apply pm_runtime_set_memalloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1357352744-8138-5-git-send-email-ming.lei@canonical.com>
Date:	Sat,  5 Jan 2013 10:25:42 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-mm@...ck.org, Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>,
	Minchan Kim <minchan@...nel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jens Axboe <axboe@...nel.dk>,
	"David S. Miller" <davem@...emloft.net>,
	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: [PATCH v7 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 and runtime_suspend callback of network devices in
iSCSI situation, so mark network devices and its ancestor as
'memalloc_noio' 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>
--
v7:
	- rebase on v3.8-rc2-next-20130104

v4:
	- call pm_runtime_set_memalloc_noio(ddev, true) after
	device_add
---
 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 29c884a..67e00b2 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -21,6 +21,7 @@
 #include <linux/vmalloc.h>
 #include <linux/export.h>
 #include <linux/jiffies.h>
+#include <linux/pm_runtime.h>
 
 #include "net-sysfs.h"
 
@@ -1409,6 +1410,8 @@ void netdev_unregister_kobject(struct net_device * net)
 
 	remove_queue_kobjects(net);
 
+	pm_runtime_set_memalloc_noio(dev, false);
+
 	device_del(dev);
 }
 
@@ -1453,6 +1456,8 @@ int netdev_register_kobject(struct net_device *net)
 		return error;
 	}
 
+	pm_runtime_set_memalloc_noio(dev, true);
+
 	return error;
 }
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/