linux-kernel - Re: [PATCH 32/91] libsas: remove expander from dev list on error

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Date:	Mon, 06 Feb 2012 08:52:21 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	Luben Tuikov <ltuikov@...oo.com>
CC:	Willy Tarreau <w@....eu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	James Bottomley <JBottomley@...allels.com>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 32/91] libsas: remove expander from dev list on error

On 02/06/2012 07:48 AM, Luben Tuikov wrote:

> Isn't this my patch? Are you submitting it as your own?


No, he just wanna backport to the stable.

> 
>         Luben
> 
> 
> On Feb 5, 2012, at 14:10, Willy Tarreau <w@....eu> wrote:
> 
>> 2.6.27-longterm review patch.  If anyone has any objections, please let us know.
>>
>> ------------------
>>
>> commit 5911e963d3718e306bcac387b83e259aa4228896 upstream.
>>
>> If expander discovery fails (sas_discover_expander()), remove the
>> expander from the port device list (sas_ex_discover_expander()),
>> before freeing it. Else the list is corrupted and, e.g., when we
>> attempt to send SMP commands to other devices, the kernel oopses.
>>
>> Signed-off-by: Luben Tuikov <ltuikov@...oo.com>
>> Reviewed-by: Jack Wang <jack_wang@...sh.com>
>> Signed-off-by: James Bottomley <JBottomley@...allels.com>
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>> ---
>> drivers/scsi/libsas/sas_expander.c |    3 +++
>> 1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> Index: longterm-2.6.27/drivers/scsi/libsas/sas_expander.c
>> ===================================================================
>> --- longterm-2.6.27.orig/drivers/scsi/libsas/sas_expander.c    2012-02-05 22:34:34.059914940 +0100
>> +++ longterm-2.6.27/drivers/scsi/libsas/sas_expander.c    2012-02-05 22:34:39.404915902 +0100
>> @@ -839,6 +839,9 @@
>>
>>    res = sas_discover_expander(child);
>>    if (res) {
>> +        spin_lock_irq(&parent->port->dev_list_lock);
>> +        list_del(&child->dev_list_node);
>> +        spin_unlock_irq(&parent->port->dev_list_lock);
>>        kfree(child);
>>        return NULL;
>>    }
>>
>>
> --
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