linux-kernel - Re: [PATCH 3/3] SCSI: Rework list handling in __scsi_target

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Message-ID: <561E6464.2020702@suse.de>
Date:	Wed, 14 Oct 2015 16:19:16 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Johannes Thumshirn <jthumshirn@...e.de>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	Christoph Hellwig <hch@...radead.org>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3]  SCSI: Rework list handling in __scsi_target_remove

On 10/14/2015 03:50 PM, Johannes Thumshirn wrote:
> Rework the list handling in __scsi_target_remove(). The new version introduces
> a reap list for devices. Devices that shall be removed are placed on the reap
> list and can then be removed later on.
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>  drivers/scsi/scsi_sysfs.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> index b41dcb3..2bd88c6 100644
> --- a/drivers/scsi/scsi_sysfs.c
> +++ b/drivers/scsi/scsi_sysfs.c
> @@ -1129,20 +1129,24 @@ static void __scsi_remove_target(struct scsi_target *starget)
>  {
>  	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
>  	unsigned long flags;
> -	struct scsi_device *sdev;
> +	struct scsi_device *sdev, *tmp;
> +	LIST_HEAD(reap_list);
>  
>  	spin_lock_irqsave(&shost->device_lock, flags);
>   restart:
> -	list_for_each_entry(sdev, &shost->__devices, siblings) {
> +	list_for_each_entry_safe(sdev, tmp, &shost->__devices, siblings) {
>  		if (sdev->channel != starget->channel ||
>  		    sdev->id != starget->id ||
>  		    scsi_device_get(sdev))
>  			continue;
> -		scsi_remove_device(sdev);
> +		list_move_tail(&sdev->siblings, &reap_list);
>  		scsi_device_put(sdev);
>  		goto restart;
>  	}
>  	spin_unlock_irqrestore(&shost->device_lock, flags);
> +
> +	list_for_each_entry_safe(sdev, tmp, &reap_list, siblings)
> +		scsi_remove_device(sdev);
>  }
>  
>  /**
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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