linux-kernel - Re: [PATCH 2/2] [MTD] Call bdi_init() and bdi

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Message-ID: <20100426170247.GP27497@kernel.dk>
Date:	Mon, 26 Apr 2010 19:02:48 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jörn Engel <joern@...fs.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Paolo Minazzi <paolo.minazzi@...il.com>
Subject: Re: [PATCH 2/2] [MTD] Call bdi_init() and bdi_register()

On Mon, Apr 26 2010, Jörn Engel wrote:
> Otherwise we hit a BUG_ON in bdi_queue_work().
> 
> Signed-off-by: Joern Engel <joern@...fs.org>
> ---
>  drivers/mtd/mtdcore.c |   17 ++++++++++++++++-
>  1 files changed, 16 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index cb4858b..8dd3e46 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -322,6 +322,12 @@ int add_mtd_device(struct mtd_info *mtd)
>  		if (!mtd_table[i]) {
>  			struct mtd_notifier *not;
>  
> +			err = bdi_register(mtd->backing_dev_info, NULL, "mtd%d",
> +					i);
> +			if (err) {
> +				/* We lose the errno information :( */
> +				break;
> +			}

This is not a good idea, even if it'll currently work.

> @@ -692,6 +698,15 @@ static int __init init_mtd(void)
>  	int ret;
>  	ret = class_register(&mtd_class);
>  
> +	ret = bdi_init(&mtd_bdi_unmappable);
> +	if (ret)
> +		return ret;
> +	ret = bdi_init(&mtd_bdi_ro_mappable);
> +	if (ret)
> +		return ret;
> +	ret = bdi_init(&mtd_bdi_rw_mappable);
> +	if (ret)
> +		return ret;

Do the bdi_register() here as well.

-- 
Jens Axboe

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