From: Hannes Reinecke <hare@suse.de>
To: Christoph Hellwig <hch@infradead.org>,
James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: [PATCH 3/6] scsi: do not manipulate device reference counts in scsi_get/put_command
Date: Wed, 12 Feb 2014 12:37:26 +0100 [thread overview]
Message-ID: <52FB5CF6.5010501@suse.de> (raw)
In-Reply-To: <20140206184417.692440766@bombadil.infradead.org>
On 02/06/2014 07:43 PM, Christoph Hellwig wrote:
> Many callers won't need this and we can optimize them away. In addition
> the handling in the __-prefixed variants was inconsistant to start with.
>
> Based on an earlier patch from Bart Van Assche.
>
But this decouples the scsi_device refcount from the number of
outstanding commands, right?
While I'm sure you've audited all call sites, it's now up to the
callers to provide proper reference counting.
Shouldn't we document it somewhere?
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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next prev parent reply other threads:[~2014-02-12 11:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-06 18:43 [PATCH 0/6] first batch of SCSI data path micro-optimizations Christoph Hellwig
2014-02-06 18:43 ` [PATCH 1/6] scsi: avoid useless free_list lock roundtrips Christoph Hellwig
2014-02-12 10:53 ` Hannes Reinecke
2014-02-06 18:43 ` [PATCH 2/6] scsi: avoid taking host_lock in scsi_run_queue unless nessecary Christoph Hellwig
2014-02-12 11:08 ` Hannes Reinecke
2014-02-12 15:52 ` Christoph Hellwig
2014-02-06 18:43 ` [PATCH 3/6] scsi: do not manipulate device reference counts in scsi_get/put_command Christoph Hellwig
2014-02-12 11:37 ` Hannes Reinecke [this message]
2014-02-12 15:58 ` Christoph Hellwig
2014-02-06 18:43 ` [PATCH 4/6] scsi: remove a useless get/put_device pair in scsi_request_fn Christoph Hellwig
2014-02-12 11:38 ` Hannes Reinecke
2014-02-06 18:43 ` [PATCH 5/6] scsi: remove a useless get/put_device pair in scsi_next_command Christoph Hellwig
2014-02-12 11:39 ` Hannes Reinecke
2014-02-06 18:43 ` [PATCH 6/6] scsi: remove a useless get/put_device pair in scsi_requeue_command Christoph Hellwig
2014-02-12 11:40 ` Hannes Reinecke
2014-02-12 15:58 ` Christoph Hellwig
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