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Message-ID: <57519670.6050306@kernel.dk>
Date: Fri, 3 Jun 2016 08:38:40 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Baolin Wang <baolin.wang@...aro.org>, agk@...hat.com,
snitzer@...hat.com, dm-devel@...hat.com,
herbert@...dor.apana.org.au, davem@...emloft.net
Cc: ebiggers3@...il.com, js1304@...il.com, tadeusz.struk@...el.com,
smueller@...onox.de, standby24x7@...il.com, shli@...nel.org,
dan.j.williams@...el.com, martin.petersen@...cle.com,
sagig@...lanox.com, kent.overstreet@...il.com,
keith.busch@...el.com, tj@...nel.org, ming.lei@...onical.com,
broonie@...nel.org, arnd@...db.de, linux-crypto@...r.kernel.org,
linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 1/3] block: Introduce blk_bio_map_sg() to map one bio
On 05/27/2016 05:11 AM, Baolin Wang wrote:
> +/*
> + * Map a bio to scatterlist, return number of sg entries setup. Caller must
> + * make sure sg can hold bio segments entries.
> + */
> +int blk_bio_map_sg(struct request_queue *q, struct bio *bio,
> + struct scatterlist *sglist)
> +{
> + struct scatterlist *sg = NULL;
> + int nsegs = 0;
> +
> + if (bio)
> + nsegs = __blk_bios_map_sg(q, bio, sglist, &sg, true);
> +
> + if (sg)
> + sg_mark_end(sg);
Put that if (sg) inside the if (bio) section, 'sg' isn't going to be
non-NULL outside of that.
Additionally, who would call this with a NULL bio? That seems odd, I'd
get rid of that check completely.
--
Jens Axboe
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