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Date:	Sun,  4 Nov 2012 19:16:28 +0800
From:	Ming Lei <>
To:	"David S. Miller" <>,
	Greg Kroah-Hartman <>
Cc:	Oliver Neukum <>,,
Subject: [PATCH v2 0/5] usbnet: avoiding access auto-suspended device

Thip patchset avoids accessing auto-suspended device in ioctl path,
which is generally triggered by some network utility(ethtool, ifconfig,

Most of network devices have the problem, but as discussed in the

the problem should be solved inside driver.

Considered that only smsc75xx and smsc95xx calls usbnet_read_cmd()
and usbnet_write_cmd() inside its resume and suspend callback, the
patcheset introduce the nopm version of the two functions which
should be called only in the resume and suspend callback. So we
can solve the problem by runtime resuming device before doing
control message things.

The patchset is against 3.7.0-rc3-next-20121102, and has been tested
OK on smsc95xx usbnet device.

Change logs:
	- rebased on the latest net-next tree, only 2/5 changed
        - rebased on 3.7.0-rc3-next-20121102, only patch 4/5 changed
        - fix one memory leak during smsc95xx_suspend, patch 3/5 added

 drivers/net/usb/smsc75xx.c |  147 +++++++++++++++++++++++++++-----------------
 drivers/net/usb/smsc95xx.c |  146 +++++++++++++++++++++++++++----------------
 drivers/net/usb/usbnet.c   |   72 ++++++++++++++++++++--
 include/linux/usb/usbnet.h |    4 ++
 4 files changed, 255 insertions(+), 114 deletions(-)

Ming Lei

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