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Message-Id: <20120527010425.489792331@linuxfoundation.org>
User-Agent: quilt/0.60-19.1
Date: Sun, 27 May 2012 10:04:35 +0900
From: Greg KH <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org,
        alan@lxorguk.ukuu.org.uk, Stanislav Yakovlev <stas.yakovlev@gmail.com>,
        Stefan Lippers-Hollmann <s.l-h@gmx.de>,
        "John W. Linville" <linville@tuxdriver.com>
Subject: [ 12/94] net/wireless: ipw2200: Fix WARN_ON occurring in wiphy_register called by ipw_pci_probe
In-Reply-To: <20120527010332.GA11170@kroah.com>
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3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stanislav Yakovlev <stas.yakovlev@gmail.com>

commit 7ed85b65ab611ba841d508ae4ff8c45fa0c48c80 upstream.

The problem was found by Stefan Lippers-Hollmann
http://marc.info/?l=linux-wireless&m=132720334512946&w=2

WARNING: at /tmp/buildd/linux-aptosid-3.2/debian/build/source_i386_none/net/wireless/core.c:562 wiphy_register+0x45/0x38d [cfg80211]()
Hardware name: TravelMate 290 \xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff
Modules linked in: ipw2200(+) iTCO_wdt libipw joydev drm snd_seq snd_timer snd_seq_device iTCO_vendor_support yenta_socket snd intel_agp i2c_i801 pcmcia_rsrc cfg80211 soundcore parport_pc psmouse parport rng_core snd_page_alloc serio_raw pcspkr i2c_algo_bit intel_gtt pcmcia_core evdev irda crc_ccitt rfkill lib80211 processor container ac battery shpchp pci_hotplug button ext4 mbcache jbd2 crc16 dm_mod sd_mod sr_mod crc_t10dif cdrom ata_generic pata_acpi ata_piix libata scsi_mod firewire_ohci firewire_core crc_itu_t 8139too 8139cp mii uhci_hcd ehci_hcd usbcore usb_common [last unloaded: scsi_wait_scan]
Pid: 328, comm: modprobe Not tainted 3.2-1.slh.4-aptosid-686 #1
Call Trace:
[<c012eaf4>] ? warn_slowpath_common+0x7c/0x8f
[<e0ff0b3e>] ? wiphy_register+0x45/0x38d [cfg80211]
[<e0ff0b3e>] ? wiphy_register+0x45/0x38d [cfg80211]
[<c012eb22>] ? warn_slowpath_null+0x1b/0x1f
[<e0ff0b3e>] ? wiphy_register+0x45/0x38d [cfg80211]
[<c01f89d7>] ? internal_create_group+0xf5/0xff
[<e0a2de1c>] ? ipw_pci_probe+0xa9a/0xbd0 [ipw2200]
[<c01519f4>] ? arch_local_irq_save+0xf/0x14
[<c0252986>] ? pci_device_probe+0x53/0x9a
[<c02c2820>] ? driver_probe_device+0x94/0x124
[<c0252871>] ? pci_match_id+0x15/0x34
[<c02c28f0>] ? __driver_attach+0x40/0x5b
[<c02c1d81>] ? bus_for_each_dev+0x37/0x60
[<c02c25aa>] ? driver_attach+0x17/0x1a
[<c02c28b0>] ? driver_probe_device+0x124/0x124
[<c02c22c4>] ? bus_add_driver+0x92/0x1d1
[<e099d000>] ? 0xe099cfff
[<c02c2cb8>] ? driver_register+0x7d/0xd4
[<c017cd50>] ? jump_label_module_notify+0xec/0x167
[<e099d000>] ? 0xe099cfff
[<c0253017>] ? __pci_register_driver+0x32/0x87
[<e099d000>] ? 0xe099cfff
[<e099d02e>] ? ipw_init+0x2e/0x72 [ipw2200]
[<c0101173>] ? do_one_initcall+0x7d/0x132
[<c0145016>] ? __blocking_notifier_call_chain+0x47/0x4f
[<c0154a73>] ? sys_init_module+0x13a4/0x159c
[<c03a639f>] ? sysenter_do_call+0x12/0x28

This warning appears only if we apply Ben Hutchings' fix
http://marc.info/?l=linux-wireless&m=132720195012653&w=2
for the bug reported by Cesare Leonardi
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=656813
with cfg80211 warning during device registration
("cfg80211: failed to add phy80211 symlink to netdev!").

We separate device bring up and registration with network stack
to avoid the problem.

After that Ben Hutchings' fix can be applied to fix the bug.

Signed-off-by: Stanislav Yakovlev <stas.yakovlev@gmail.com>
Tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/ipw2x00/ipw2200.c |   21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

--- a/drivers/net/wireless/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/ipw2x00/ipw2200.c
@@ -11443,20 +11443,6 @@ static void ipw_bg_down(struct work_stru
 	mutex_unlock(&priv->mutex);
 }
 
-/* Called by register_netdev() */
-static int ipw_net_init(struct net_device *dev)
-{
-	int rc = 0;
-	struct ipw_priv *priv = libipw_priv(dev);
-
-	mutex_lock(&priv->mutex);
-	if (ipw_up(priv))
-		rc = -EIO;
-	mutex_unlock(&priv->mutex);
-
-	return rc;
-}
-
 static int ipw_wdev_init(struct net_device *dev)
 {
 	int i, rc = 0;
@@ -11722,7 +11708,6 @@ static void ipw_prom_free(struct ipw_pri
 #endif
 
 static const struct net_device_ops ipw_netdev_ops = {
-	.ndo_init		= ipw_net_init,
 	.ndo_open		= ipw_net_open,
 	.ndo_stop		= ipw_net_stop,
 	.ndo_set_rx_mode	= ipw_net_set_multicast_list,
@@ -11849,6 +11834,12 @@ static int __devinit ipw_pci_probe(struc
 		goto out_release_irq;
 	}
 
+	if (ipw_up(priv)) {
+		mutex_unlock(&priv->mutex);
+		err = -EIO;
+		goto out_remove_sysfs;
+	}
+
 	mutex_unlock(&priv->mutex);
 	err = register_netdev(net_dev);
 	if (err) {


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