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

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Message-Id: <613D92FB-4573-4301-BC1A-8DA114FE2A5F@yahoo.com>
Date:	Sun, 5 Feb 2012 17:14:26 -0800
From:	Luben Tuikov <ltuikov@...oo.com>
To:	"gaowanlong@...fujitsu.com" <gaowanlong@...fujitsu.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

Where is the "From:" tag that would appear in "git log"?

        Luben


On Feb 5, 2012, at 16:52, Wanlong Gao <gaowanlong@...fujitsu.com> wrote:

> 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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> 
> 
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