netdev - Re: bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!

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Message-ID: <CAHPKR9J2FsGUC7kQU2WUMXOhzz0nWLwGn_KbOOp2YbjXOsFAOg@mail.gmail.com>
Date:	Thu, 5 Jun 2014 16:24:13 +0530
From:	Balakumaran Kannan <kumaran.4353@...il.com>
To:	"Arankal, Nagaraj P" <nagaraj.p.arankal@...com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0
 resource_bit 0x1. Unlock was called but lock wasn't taken!

Hi Arankal,

'bnx2x_acquire_hw_lock' defined in
'drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c' file could fail on
multiple reasons. So it is mandatory to check the return value of that
function.

But I can see multiple functions call 'bnx2x_acquire_hw_lock' and
proceed without checking the return value in the same file. It seems
like a bug.

Regards,
K.Balakumaran

On Thu, Jun 5, 2014 at 3:44 PM, Arankal, Nagaraj P
<nagaraj.p.arankal@...com> wrote:
> Hi,
> While executing some functional tests on one of my Server containing bnx2x card, I have observed following messages in /var/log/kern.log
>
>
> root@...80g8-2x:/var/log# cat /var/log/kern.log
> May 14 06:56:55 dl380g8-2x kernel: [59572.519249] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 06:56:55 dl380g8-2x kernel: [59572.519260] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 07:21:11 dl380g8-2x kernel: [61028.418935] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 07:21:11 dl380g8-2x kernel: [61028.418946] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 08:42:32 dl380g8-2x kernel: [65906.724350] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 08:42:32 dl380g8-2x kernel: [65906.724361] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 09:37:16 dl380g8-2x kernel: [69188.417427] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 09:37:16 dl380g8-2x kernel: [69188.417438] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 09:55:19 dl380g8-2x kernel: [70270.645449] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 09:55:19 dl380g8-2x kernel: [70270.645460] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 12:41:23 dl380g8-2x kernel: [80229.646043] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 12:41:23 dl380g8-2x kernel: [80229.646055] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 14:45:01 dl380g8-2x kernel: [87643.062018] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 14:45:01 dl380g8-2x kernel: [87643.062029] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> May 14 15:12:15 dl380g8-2x kernel: [89276.234304] bnx2x: [bnx2x_acquire_hw_lock:2192(eth3)]Timeout
> May 14 15:12:15 dl380g8-2x kernel: [89276.234315] bnx2x: [bnx2x_release_hw_lock:2226(eth3)]lock_status 0x0 resource_bit 0x1. Unlock was called but lock wasn't taken!
> root@...80g8-2x:/var/log#
>
>
> Any idea why?
>
> Kernel version : 3.6.26
> Bnx2x driver version : 1.78.80
>
> Thanks,
> Nagaraj
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