linux-kernel - Re: iwlagn driver segfault in 2.6.28-rc3

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Date:	Wed, 12 Nov 2008 23:07:21 -0800
From:	reinette chatre <reinette.chatre@...el.com>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>
Subject: Re: iwlagn driver segfault in 2.6.28-rc3

On Tue, 2008-11-11 at 06:34 -0800, Lukas Hejtmanek wrote:
> Hello,
> 
> I accidentaly got the following oops:
> 
> [54644.622141] wlan0: association with AP 00:13:80:43:9d:d0 timed out
> [54655.006025] iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
> [54655.006444] iwlagn 0000:03:00.0: irq 40 for MSI/MSI-X
> [54655.006715] general protection fault: 0000 [#1] SMP 
> [54655.006723] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.1/host3/target3:0:0/3:0:0:0/block/sr0/stat
> [54655.006728] Dumping ftrace buffer:
> [54655.006733]    (ftrace buffer empty)
> [54655.006737] CPU 0 
> [54655.006740] Modules linked in: aes_x86_64 aes_generic arc4 ecb iwlagn iwlcore mac80211 cfg80211 i915 drm rfcomm bri
> dge stp llc bnep sco l2cap tp_smapi thinkpad_ec btusb bluetooth fuse thinkpad_acpi rfkill e1000e wmi intel_agp snd_hda_intel [last unloaded: ehci_hcd]
> [54655.006785] Pid: 13515, comm: wpa_supplicant Not tainted 2.6.28-rc3 #27
> [54655.006789] RIP: 0010:[<ffffffffa0149db7>]  [<ffffffffa0149db7>] iwl_eeprom_query16+0x7/0x20 [iwlcore]
> 

I do not know why the eeprom will not be available at this point. Could you please try the patch below and let us know if you hit the error?

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index db31a52..307b77e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2585,6 +2585,10 @@ static int iwl4965_mac_start(struct ieee80211_hw *hw)
 
 	IWL_DEBUG_MAC80211("enter\n");
 
+	if (!priv->eeprom) {
+		IWL_ERROR("EEPROM not initialized.\n");
+		return -EIO;
+	}
 	if (pci_enable_device(priv->pci_dev)) {
 		IWL_ERROR("Fail to pci_enable_device\n");
 		return -ENODEV;


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