From: Ming Lin <mlin@kernel.org>
To: Keith Busch <keith.busch@intel.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
lkml <linux-kernel@vger.kernel.org>,
Ming Lin <ming.l@ssi.samsung.com>
Subject: Re: [PATCH 1/8] blk-mq: add blk_mq_alloc_request_hctx
Date: Tue, 7 Jun 2016 08:27:29 -0700 [thread overview]
Message-ID: <CAF1ivSYpbzPF+5_e+hEKZ_-t7=UhijULbkvF=SodSF7FD5YS-A@mail.gmail.com> (raw)
In-Reply-To: <20160607145736.GB28414@localhost.localdomain>
On Tue, Jun 7, 2016 at 7:57 AM, Keith Busch <keith.busch@intel.com> wrote:
> On Mon, Jun 06, 2016 at 11:21:52PM +0200, Christoph Hellwig wrote:
>> +struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
>> + unsigned int flags, unsigned int hctx_idx)
>> +{
>> + struct blk_mq_hw_ctx *hctx;
>> + struct blk_mq_ctx *ctx;
>> + struct request *rq;
>> + struct blk_mq_alloc_data alloc_data;
>> + int ret;
>> +
>> + ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT);
>> + if (ret)
>> + return ERR_PTR(ret);
>> +
>> + hctx = q->queue_hw_ctx[hctx_idx];
>
> We probably want to check 'if (hctx_idx < q->nr_hw_queues)' before
> getting the hctx. Even if hctx_idx was origially valid, it's possible
> (though unlikely) blk_queue_enter waits on reallocating h/w contexts,
> which can make hctx_idx invalid.
Yes, I'll update it.
next prev parent reply other threads:[~2016-06-07 15:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 21:21 generic NVMe over Fabrics library support Christoph Hellwig
2016-06-06 21:21 ` [PATCH 1/8] blk-mq: add blk_mq_alloc_request_hctx Christoph Hellwig
2016-06-07 14:57 ` Keith Busch
2016-06-07 15:27 ` Ming Lin [this message]
2016-06-07 23:21 ` Ming Lin
2016-06-08 4:49 ` Jens Axboe
2016-06-08 5:20 ` Ming Lin
2016-06-08 11:56 ` Christoph Hellwig
2016-06-08 11:54 ` Christoph Hellwig
2016-06-06 21:21 ` [PATCH 2/8] nvme: allow transitioning from NEW to LIVE state Christoph Hellwig
2016-06-06 21:21 ` [PATCH 3/8] nvme: Modify and export sync command submission for fabrics Christoph Hellwig
2016-06-06 21:21 ` [PATCH 4/8] nvme: add fabrics sysfs attributes Christoph Hellwig
2016-06-07 8:52 ` Johannes Thumshirn
2016-06-07 10:51 ` Christoph Hellwig
2016-06-07 15:21 ` Christoph Hellwig
2016-06-06 21:21 ` [PATCH 5/8] nvme.h: add NVMe over Fabrics definitions Christoph Hellwig
2016-06-06 21:21 ` [PATCH 6/8] nvme-fabrics: add a generic NVMe over Fabrics library Christoph Hellwig
2016-06-06 21:21 ` [PATCH 7/8] nvme.h: Add keep-alive opcode and identify controller attribute Christoph Hellwig
2016-06-06 21:21 ` [PATCH 8/8] nvme: add keep-alive support Christoph Hellwig
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