linux-kernel - Re: [PATCH v4 2/2] s390/dasd: remove ioctl_by

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Date:   Wed, 7 Oct 2020 14:23:52 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Stefan Haberland <sth@...ux.ibm.com>, axboe@...nel.dk,
        hoeppner@...ux.ibm.com, linux-s390@...r.kernel.org,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] s390/dasd: remove ioctl_by_bdev calls



On 07.10.20 14:14, Christoph Hellwig wrote:
> On Wed, Oct 07, 2020 at 02:09:18PM +0200, Christian Borntraeger wrote:
>> Unfortunately not. On insmodding virtio_blk I do get:
> 
> Yeah, the symbol_put needs to be conditional as well.  New version below:

Yes, this works.
> 
> diff --git a/block/partitions/ibm.c b/block/partitions/ibm.c
> index d6e18df9c53c6d..4b044e620d3534 100644
> --- a/block/partitions/ibm.c
> +++ b/block/partitions/ibm.c
> @@ -305,8 +305,6 @@ int ibm_partition(struct parsed_partitions *state)
>  	if (!disk->fops->getgeo)
>  		goto out_exit;
>  	fn = symbol_get(dasd_biodasdinfo);
> -	if (!fn)
> -		goto out_exit;
>  	blocksize = bdev_logical_block_size(bdev);
>  	if (blocksize <= 0)
>  		goto out_symbol;
> @@ -326,7 +324,7 @@ int ibm_partition(struct parsed_partitions *state)
>  	geo->start = get_start_sect(bdev);
>  	if (disk->fops->getgeo(bdev, geo))
>  		goto out_freeall;
> -	if (fn(disk, info)) {
> +	if (!fn || fn(disk, info)) {
>  		kfree(info);
>  		info = NULL;
>  	}
> @@ -370,7 +368,8 @@ int ibm_partition(struct parsed_partitions *state)
>  out_nogeo:
>  	kfree(info);
>  out_symbol:
> -	symbol_put(dasd_biodasdinfo);
> +	if (fn)
> +		symbol_put(dasd_biodasdinfo);
>  out_exit:
>  	return res;
>  }
>