linux-kernel - Re: [3.7.0 regression] rt2x00lib_probe_dev: Error

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Date:	Mon, 17 Dec 2012 13:22:48 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	"devendra.aaru" <devendra.aaru@...il.com>
Cc:	Mikael Pettersson <mikpe@...uu.se>, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [3.7.0 regression] rt2x00lib_probe_dev: Error - Failed to
 initialize hw

devendra.aaru writes:
 > On Mon, Dec 17, 2012 at 5:51 AM, Mikael Pettersson <mikpe@...uu.se> wrote:
 > > I just updated an old 1st gen AMD64 laptop from kernel 3.6.0 to 3.7.0,
 > > Fedora 15 user-space, and was greeted by the following kernel warning:
 > >
 > > WARNING: at net/wireless/core.c:389 wiphy_register+0x5c3/0x600 [cfg80211]()
 > 
 > I am seeing this line actually when i do vim +389 net/wireless/core.c.
 > 
 >                 u16 all_iftypes = 0;
 > 
 > its good if you tell us the top sha1 of yours?

It's the plain linux-3.7.tar.xz from kernel.org, no git involved.
Lines 389-390 of net/wireless/core.c are:

                if (WARN_ON(c->max_interfaces < 2))
                        return -EINVAL;

/Mikael

 > 
 > 
 > > Hardware name: SAM#451B
 > > Modules linked in: rt2500pci(+) snd_mpu401_uart rt2x00pci snd_rawmidi rt2x00lib sg snd_seq_device mac80211 cfg80211 amd64_agp agpgart snd eeprom_93cx6 soundcore via_rhine mii evdev ipv6 ehci_hcd uhci_hcd sr_mod cdrom usbcore usb_common
 > > Pid: 378, comm: modprobe Not tainted 3.7.0 #1
 > > Call Trace:
 > >  [<ffffffff810260b9>] ? warn_slowpath_common+0x79/0xc0
 > >  [<ffffffffa0115773>] ? wiphy_register+0x5c3/0x600 [cfg80211]
 > >  [<ffffffff810c5b3f>] ? __kmalloc+0xef/0x170
 > >  [<ffffffffa013ac97>] ? ieee80211_register_hw+0x347/0x6d0 [mac80211]
 > >  [<ffffffffa00f92ed>] ? rt2x00lib_probe_dev+0x53d/0x720 [rt2x00lib]
 > >  [<ffffffffa0060888>] ? rt2x00pci_probe+0x168/0x2e4 [rt2x00pci]
 > >  [<ffffffff81194cd0>] ? pci_device_probe+0xd0/0x170
 > >  [<ffffffff811f2934>] ? driver_probe_device+0x64/0x210
 > >  [<ffffffff811f2b73>] ? __driver_attach+0x93/0xa0
 > >  [<ffffffff811f2ae0>] ? driver_probe_device+0x210/0x210
 > >  [<ffffffff811f0f95>] ? bus_for_each_dev+0x45/0x80
 > >  [<ffffffff811f20d8>] ? bus_add_driver+0x178/0x250
 > >  [<ffffffff811f314e>] ? driver_register+0x6e/0x170
 > >  [<ffffffff81048a14>] ? notifier_call_chain+0x44/0x60
 > >  [<ffffffffa0196000>] ? 0xffffffffa0195fff
 > >  [<ffffffff810002ca>] ? do_one_initcall+0x11a/0x160
 > >  [<ffffffff81069786>] ? sys_init_module+0x76/0x1c0
 > >  [<ffffffff812c15d0>] ? system_call_fastpath+0x16/0x1b
 > > ---[ end trace f8413f27de31929d ]---
 > > phy0 -> rt2x00lib_probe_dev: Error - Failed to initialize hw.
 > > rt2500pci: probe of 0000:00:0c.0 failed with error -22
 > >
 > > Rebooting into 3.6.0 shows no such error, booting 3.7.0 again shows the error,
 > > so it's completely reproducible.
 > >
 > 
 > there are lots of WARN_ON's btw, :) may be one of them triggered, but
 > please tell us the top sha1 of yours, so that the wireless dev's can
 > easily see whats' happening with the rt2x00 to trigger this :)
 > 
 > 
 > > lspci -v for the device in question:
 > >
 > > 00:0c.0 Network controller: Ralink corp. RT2500 802.11g (rev 01)
 > >         Subsystem: Micro-Star International Co., Ltd. Unknown 802.11g mini-PCI Adapter
 > >         Flags: bus master, slow devsel, latency 64, IRQ 18
 > >         Memory at d0000000 (32-bit, non-prefetchable) [size=8K]
 > >         Capabilities: [40] Power Management version 2
 > >         Kernel driver in use: rt2500pci
 > >         Kernel modules: rt2500pci
 > >
 > > I've never actually used or configured this device (the laptop is always
 > > on wired ethernet), but thought you should know about this possible driver
 > > regression.
 > >
 > > /Mikael
 > > --
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 > > Please read the FAQ at  http://www.tux.org/lkml/
 > 
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