From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Christoph Hellwig <hch@lst.de>,
James Bottomley <james.bottomley@hansenpartnership.com>,
Johannes Thumshirn <jth@kernel.org>,
Doug Gilberg <dgilbert@interlog.com>,
linux-scsi@vger.kernel.org, stable@vger.kernel.org,
Hannes Reinecke <hare@suse.com>
Subject: Re: [PATCH 2/4] sg: protect access to to 'reserved' page array
Date: Fri, 3 Feb 2017 11:24:32 +0100 [thread overview]
Message-ID: <20170203102432.GB29163@lst.de> (raw)
In-Reply-To: <1486112091-68470-3-git-send-email-hare@suse.de>
On Fri, Feb 03, 2017 at 09:54:49AM +0100, Hannes Reinecke wrote:
> The 'reserved' page array is used as a short-cut for mapping
> data, saving us to allocate pages per request.
> However, the 'reserved' array is only capable of holding one
> request, so we need to protect it against concurrent accesses.
Can you please explain how you protect the access here a bit more,
as mentioned before the set_bit for exclusion trick is always
suspicious, so the changelog needs to have a justification for it.
next prev parent reply other threads:[~2017-02-03 10:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-03 8:54 [PATCH 0/4] sanitize sg Hannes Reinecke
2017-02-03 8:54 ` [PATCH 1/4] sg: disable SET_FORCE_LOW_DMA Hannes Reinecke
2017-02-03 9:32 ` Johannes Thumshirn
2017-02-03 10:16 ` Hannes Reinecke
2017-02-03 10:23 ` Christoph Hellwig
2017-02-03 8:54 ` [PATCH 2/4] sg: protect access to to 'reserved' page array Hannes Reinecke
2017-02-03 9:34 ` Johannes Thumshirn
2017-02-03 10:24 ` Christoph Hellwig [this message]
2017-02-03 10:45 ` Hannes Reinecke
2017-02-03 8:54 ` [PATCH 3/4] sg: check for valid direction before starting the request Hannes Reinecke
2017-02-03 10:28 ` Christoph Hellwig
2017-02-03 10:50 ` Hannes Reinecke
2017-02-03 11:46 ` Hannes Reinecke
2017-02-03 8:54 ` [PATCH 4/4] sg: use standard lists for sg_requests Hannes Reinecke
2017-02-03 9:38 ` Johannes Thumshirn
2017-02-03 10:43 ` Christoph Hellwig
2017-02-03 10:48 ` Hannes Reinecke
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