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

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Message-ID: <3B54164438364A3A9A2F19AFF5A4DF0A@usish.com.cn>
Date:	Wed, 27 Jul 2011 11:26:25 +0800
From:	"Jack Wang" <jack_wang@...sh.com>
To:	"'Luben Tuikov'" <ltuikov@...oo.com>,
	"'James Bottomley'" <James.Bottomley@...e.de>,
	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] [SCSI] libsas: remove expander from dev list on error

 [PATCH] [SCSI] libsas: remove expander from dev list on error
> 
> 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>
> ---
>  drivers/scsi/libsas/sas_expander.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/scsi/libsas/sas_expander.c
> b/drivers/scsi/libsas/sas_expander.c
> index 874e29d..f84084b 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -849,6 +849,9 @@ static struct domain_device *sas_ex_discover_expander(
> 
>      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;
>      }
> --
[Jack Wang] Looks reasonable, thanks for fix this.
You can add my Reviewed-by: Jack Wang <jack_wang@...sh.com> if needed.

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