linux-kernel - Re: lockdep warning from firmware loader

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Date:	Fri, 1 May 2009 03:18:01 +0530
From:	Rabin Vincent <rabin@....in>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	jaswinderrajput@...il.com, linux-scsi@...r.kernel.org
Subject: Re: lockdep warning from firmware loader

(CCs added)

On Fri, Apr 24, 2009 at 10:21:13AM +0300, Meelis Roos wrote:
> This 2.6.30-rc3 running on SMP sparc64. Loading the qla1280 pci scsi 
> driver causes a firmware load that in turn causes a lockdep warning like 
> below. Firmware loading still seems to work fine.
[..]
> Apr 23 22:20:39 korvits kernel: [  143.912020] qla1280: QLA1040 found on PCI bus 0, dev 3
> Apr 23 22:20:39 korvits kernel: [  143.971811] PCI: Enabling device: (0002:00:03.0), cmd 7
> Apr 23 22:20:39 korvits kernel: [  143.972842] ------------[ cut here ]------------
> Apr 23 22:20:39 korvits kernel: [  144.026699] WARNING: at kernel/lockdep.c:2280 lockdep_trace_alloc+0xbc/0x100()
> Apr 23 22:20:39 korvits kernel: [  144.113197] Modules linked in:
> Apr 23 22:20:39 korvits kernel: [  144.149622] Call Trace:
> Apr 23 22:20:39 korvits kernel: [  144.178818]  [000000000045d7cc] warn_slowpath+0x6c/0xa0
> Apr 23 22:20:39 korvits kernel: [  144.241329]  [00000000004886fc] lockdep_trace_alloc+0xbc/0x100
> Apr 23 22:20:39 korvits kernel: [  144.311140]  [00000000004e67b8] kmem_cache_alloc+0x18/0x160
> Apr 23 22:20:39 korvits kernel: [  144.377821]  [0000000000604d68] _request_firmware+0x28/0x520
> Apr 23 22:20:39 korvits kernel: [  144.445533]  [000000000060531c] request_firmware+0x1c/0x40
> Apr 23 22:20:39 korvits kernel: [  144.511180]  [000000000061ba98] qla1280_load_firmware+0x2f8/0x7e0
> Apr 23 22:20:39 korvits kernel: [  144.584108]  [00000000006e1498] qla1280_probe_one+0x390/0x7a8
> Apr 23 22:20:39 korvits kernel: [  144.652874]  [00000000005ce55c] local_pci_probe+0x1c/0x40
> Apr 23 22:20:39 korvits kernel: [  144.717468]  [00000000005ce8e0] pci_device_probe+0x60/0xa0
> Apr 23 22:20:39 korvits kernel: [  144.783106]  [00000000005fff78] driver_probe_device+0x78/0x1a0
> Apr 23 22:20:39 korvits kernel: [  144.852911]  [000000000060012c] __driver_attach+0x8c/0xa0
> Apr 23 22:20:39 korvits kernel: [  144.917505]  [00000000005ff6c8] bus_for_each_dev+0x68/0xa0
> Apr 23 22:20:39 korvits kernel: [  144.983141]  [00000000005ffde0] driver_attach+0x20/0x40
> Apr 23 22:20:39 korvits kernel: [  145.045657]  [00000000005fee64] bus_add_driver+0x104/0x280
> Apr 23 22:20:39 korvits kernel: [  145.111292]  [0000000000600454] driver_register+0x74/0x180
> Apr 23 22:20:39 korvits kernel: [  145.176928]  [00000000005cedb4] __pci_register_driver+0x54/0xe0
> Apr 23 22:20:39 korvits kernel: [  145.247808] ---[ end trace 6edbdc497698d192 ]---
> Apr 23 22:20:39 korvits kernel: [  145.302997] qla1280 0002:00:03.0: firmware: using built-in firmware qlogic/1040.bin

This is because the driver calls request_firmware() with interrupts
disabled.

Rabin
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