linux-kernel - Re: [PATCH] cxgb4i: Remove the scsi host device when removing device

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Date:	Wed, 16 Jan 2013 23:17:01 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
CC:	linux-scsi@...r.kernel.org, JBottomley@...allels.com,
	linux-kernel@...r.kernel.org, kxie@...lsio.com,
	Divy La Rey <divy@...lsio.com>
Subject: Re: [PATCH] cxgb4i: Remove the scsi host device when removing device

On 01/11/2013 01:12 PM, Thadeu Lima de Souza Cascardo wrote:
> When doing a hotplug remove of a cxgb4 device, there are still dandling
> symlinks at /sys/class/scsi_host/hostX to the removed PCI device. The
> upper layer device may also try to send data, which may crash the
> system.
> 
> The DETACH message from the lower level driver is sent to the ULD when
> the device is removed, when the scsi host should be removed from the
> system, avoiding any problems.
> 
> After this patch, there are no more dangling symlinks and many attempts
> to crash the system while there is SCSI activity and removing the device
> have failed. Adding the device back again works as expected, with the
> scsi hosts showing up again.
> 
> Based on a patch by Karen Xie.
> 
> Cc: Karen Xie <kxie@...lsio.com>
> Cc: Divy La Rey <divy@...lsio.com>
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
> ---
>  drivers/scsi/cxgbi/cxgb4i/cxgb4i.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> index f924b3c..3fecf35 100644
> --- a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> +++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> @@ -1564,6 +1564,7 @@ static int t4_uld_state_change(void *handle, enum cxgb4_state state)
>  		break;
>  	case CXGB4_STATE_DETACH:
>  		pr_info("cdev 0x%p, DETACH.\n", cdev);
> +		cxgbi_device_unregister(cdev);
>  		break;
>  	default:
>  		pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
> 

Patch looks ok to me.

Reviewed-by: Mike Christie <michaelc@...wisc.edu>

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