linux-kernel - Re: [patch] blk-integrity: checking for NULL instead of IS

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Date:	Wed, 09 Dec 2015 11:26:27 +0100
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Keith Busch <keith.busch@...el.com>
Cc:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] blk-integrity: checking for NULL instead of IS_ERR

On Wed, 2015-12-09 at 13:21 +0300, Dan Carpenter wrote:
> We recently changed bio_integrity_alloc() to return ERR_PTRs instead of
> NULL but these calls were missed.
> 
> Fixes: 06c1e3902aa7 ('blk-integrity: empty implementation when disabled')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/block/bio-integrity.c b/block/bio-integrity.c
> index e6ba501..711e4d8d 100644
> --- a/block/bio-integrity.c
> +++ b/block/bio-integrity.c
> @@ -298,10 +298,10 @@ int bio_integrity_prep(struct bio *bio)
>  
>  	/* Allocate bio integrity payload and integrity vectors */
>  	bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
> -	if (unlikely(bip == NULL)) {
> +	if (IS_ERR(bip)) {
>  		printk(KERN_ERR "could not allocate data integrity
> bioset\n");
>  		kfree(buf);
> -		return -EIO;
> +		return PTR_ERR(bip);
>  	}
>  
>  	bip->bip_flags |= BIP_BLOCK_INTEGRITY;
> @@ -465,9 +465,8 @@ int bio_integrity_clone(struct bio *bio, struct bio
> *bio_src,
>  	BUG_ON(bip_src == NULL);
>  
>  	bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
> -
> -	if (bip == NULL)
> -		return -EIO;
> +	if (IS_ERR(bip))
> +		return PTR_ERR(bip);
>  
>  	memcpy(bip->bip_vec, bip_src->bip_vec,
>  	       bip_src->bip_vcnt * sizeof(struct bio_vec));
> --
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Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

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